WSR 17-22-111
PROPOSED RULES
DEPARTMENT OF
LABOR AND INDUSTRIES
[Filed October 31, 2017, 11:13 a.m.]
Original Notice.
Preproposal statement of inquiry was filed as WSR 16-13-121.
Title of Rule and Other Identifying Information: Chapter 296-840 WAC, Respirable crystalline silica; WAC 296-841-20025 Permissible exposure limits (PELs) and 296-307-62625 Permissible exposure limits of air contaminants.
Hearing Location(s): On December 15, 2017, at 9:00 a.m., at the Department of Labor and Industries (L&I), 7273 Linderson Way S.W., Room S119, Tumwater, WA 98501.
Date of Intended Adoption: January 23, 2018.
Submit Written Comments to: Josefina Magana, P.O. Box 44620, Olympia, WA 98504-4620, email josefina.magana@lni.wa.gov, fax 360-902-5619, by December 22, 2017.
Assistance for Persons with Disabilities: Contact Josefina Magana, phone 360-902-4233, fax 360-902-5619, email Josefina.Magana@lni.wa.gov, by December 1, 2017.
Purpose of the Proposal and Its Anticipated Effects, Including Any Changes in Existing Rules: The Occupational Safety and Health Administration (OSHA) estimates that an approximate number of two million construction workers are exposed to respirable crystalline silica in over six hundred thousand workplaces and two hundred ninety-five thosand workers in over seventy-five thousand general industry and maritime workplaces. Thus, federal OSHA requirements pertaining to respirable crystalline silica in both 29 C.F.R. 1926.1153 (Construction) and 29 C.F.R. 1910.1053 (General Industry/Maritime) went into effect June 23, 2016.
The purpose of this proposal is to add a new chapter 296-840 WAC, Respirable crystalline silica, to address and limit worker exposure to respirable crystalline silica in workplaces, with the intent of curbing lung cancer incidents, silicosis, chronic obstructive pulmonary disease and kidney disease in Washington workers.
The division of occupational safety and health (DOSH) did not have a standard that specifically addressed respirable crystalline silica exposure in the workplace, thus we are combining OSHA's two rules into an entirely new chapter to ensure that Washington's OSHA's rules are "at-least-as-effective-as" those promulgated by OSHA. Furthermore, the following sections under WAC 296-841-20025 and 296-307-62625 will be updated to reference the respirable crystalline silica rule. The proposed changes include:
Amended Sections
WAC 296-841-20025 Permissible exposure limits (PELs) and 296-307-62625 Permissible exposure limits of air contaminants.
Update table to reflect current PEL requirements.
New Sections
WAC 296-840-095 Definitions.
Add definitions for the following: Action level, competent person, construction work, director, DOSH, employee exposure, high-efficiency particulate air filter, objective data, PEL, physician or other licensed health care professional, regulated area, respirable crystalline silica, specialist.
WAC 296-840-100 Scope and application.
Add this section to explain that this chapter covers occupational exposures to respirable crystalline silica.
This section also provides exemptions to this proposed rule.
WAC 296-840-105 Exposure assessment.
Add this section to address the following areas that relate to occupational exposures to respirable crystalline silica:
-
PEL
-
Exposure assessment
-
Reassessment of exposures
-
Methods of sample analysis
-
Employee notification of assessment results
-
Observation of monitoring
WAC 296-840-110 Specified exposure control methods.
Add this section relating to construction work and other occupational exposures where the task performed is indistinguishable from a construction task identified in Table 1 of this proposed rule.
Add language to this section relating to implementing control measures.
Add language to this section relating to when respiratory protection is required.
Add Table 1 to this section relating to specified exposure control methods when working with materials containing crystalline silica.
WAC 296-840-115 Regulated areas.
Add this section for general industry/maritime, required to be established in areas where exposures exceed PEL and to limit access to the area.
WAC 296-840-120 Methods of compliance.
Add methods of compliance where tasks listed in Table 1 do not apply, including engineering and work practice controls, as well as abrasive blasting.
WAC 296-840-125 Respiratory protection.
Add this section that highlights requirements for respiratory protection.
WAC 296-840-130 Respiratory protection program.
Add respiratory protection program in accordance with chapter 296-842 WAC, Respirators.
Add respirator use in accordance with Table 1.
WAC 296-840-135 Housekeeping.
Add this section that addresses how a contaminated space can be cleaned.
WAC 296-840-140 Written exposure control plan.
Add requirements that apply to both general industry/maritime and construction industries.
Add a written plan with a description of tasks that involve exposure to silica, engineering control work practices and respiratory protection.
Add language that indicates employers should have written plan available to each employee.
Add language for construction that requires procedures used to restrict access to work areas.
Add requirement language relating to a competent person.
WAC 296-840-145 Medical surveillance.
Add this section that requires medical surveillance to be available. Medical surveillance includes an initial examination, periodic examinations, and where needed examinations by a specialist.
Add tuberculosis form to help ensure tuberculosis assessment is thorough.
WAC 296-840-150 Communication of respirable crystalline silica hazards to employees.
Add section that requires employers to comply with chapter 296-901 WAC, Globally harmonized system for hazard communication.
Add language that specifies what to include in posted signs.
Add language indicating that employees must understand health hazards associated with silica, tasks that could result in exposure, and measures to protect workers from exposure.
WAC 296-840-155 Recordkeeping.
Add this section indicating employers must maintain records of exposure and objective data that describes employee exposure, and medical surveillance methods.
WAC 296-840-160 Effective dates.
Add language indicating when this proposed rule becomes effective for construction and general/maritime industry.
WAC 296-840-165 Appendix AMethods of sample analysis.
Add this section that explains the process employers are required to use when analyzing air samples and quality control procedures for respirable crystalline silica.
Reasons Supporting Proposal: By law, L&I's DOSH is required to update our rules to be at-least-as-effective-as federal OSHA.
Statutory Authority for Adoption: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060.
Statute Being Implemented: Chapter 49.17 RCW.
Rule is necessary because of federal law, 29 C.F.R. 1910.1053 Subpart Z and 29 C.F.R. 1926 Subpart Z.
Name of Proponent: L&I, governmental.
Name of Agency Personnel Responsible for Drafting: Chris Miller, Tumwater, Washington, 360-902-5516; Implementation and Enforcement: Anne Soiza, Tumwater, Washington, 360-902-5090.
A school district fiscal impact statement is not required under RCW 28A.305.135.
A cost-benefit analysis is not required under RCW 34.05.328. A cost-benefit analysis is not required as this rule making is adopting or incorporating by reference, without material change, federal statutes or regulatory changes.
This rule proposal, or portions of the proposal, is exempt from requirements of the Regulatory Fairness Act because the proposal:
Is exempt under RCW 19.85.061 because this rule making is being adopted solely to conform and/or comply with federal statute or regulations. Citation of the specific federal statute or regulation and description of the consequences to the state if the rule is not adopted: 29 C.F.R. 1910.1053 Subpart Z and 29 C.F.R. 1926 Subpart Z. If L&I doesn't adopt the new regulations, we would not be as-effective-as federal OSHA.
October 31, 2017
Joel Sacks
Director
AMENDATORY SECTION (Amending WSR 06-08-087, filed 4/4/06, effective 9/1/06)
WAC 296-307-62625 Permissible exposure limits of air contaminants.
IMPORTANT:
The following information applies to Table 3, Permissible Exposure Limits for Air Contaminants.
• Exposure needs to be determined from personal air samples taken in the breathing zone or from monitoring representative of the employee's breathing zone.
• Ppm refers to parts of vapor or gas per million parts of air by volume, at 25 degrees C and 760 mm Hg pressure.
• Mg/m3 refers to milligrams of substance per cubic meter of air.
• For a metal that is measured as the metal itself, only the CAS number for the metal is given. The CAS numbers for individual compounds of the metal are not provided. For more information about CAS registry numbers see the web site: http://www.cas.org.
• Time weighted averages (TWA8) represent the maximum allowed average exposure for any 8-hour time period. For work periods longer than 8 hours the TWA8 needs to be determined using the 8 continuous hours with the highest average concentration.
• Short-term exposure limits (STEL) represent maximum allowed average exposure for any fifteen-minute period, unless another time period is noted in Table 3.
• The ceiling represents the maximum allowed exposure for the shortest time period that can feasibly be measured.
• An "X" in the "skin" column indicates the substance can be absorbed through the skin, either by airborne or direct contact.
• Requirements for the use of gloves, coveralls, goggles, and other personal protective equipment can be found in WAC 296-307-100.
• The respirable fraction of particulate is measured by sampling with a size-selector having the following characteristics:
Mean aerodynamic
diameter in micrometers
Percent passing the
selector
1
97
2
91
3
74
4
50
5
30
6
17
7
9
8
5
10
1
Table 3 "Permissible Exposure Limits for Air Contaminants"
Substance
CAS
TWA8
STEL
Ceiling
Skin
Abate (Temephos)
3383-96-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Acetaldehyde
75-07-0
100 ppm
150 ppm
——
——
Acetic acid
64-19-7
10 ppm
20 ppm
——
——
Acetic anhydride
108-24-7
——
——
5 ppm
——
Acetone
67-64-1
750 ppm
1,000 ppm
——
——
Acetonitrile
75-05-8
40 ppm
60 ppm
——
——
2-Acetylaminofluorene
53-96-3
——
——
——
——
Acetylene
74-86-2
Simple asphyxiant
——
——
——
Acetylene dichloride
(1,2-Dichloroethylene)
540-59-0
200 ppm
250 ppm
——
——
Acetylene tetrabromide
79-27-6
1 ppm
3 ppm
——
——
Acetylsalicylic acid (Aspirin)
50-78-2
5 mg/m3
10 mg/m3
——
——
Acrolein
107-02-8
0.1 ppm
0.3 ppm
——
——
Acrylamide
79-06-1
0.03 mg/m3
0.09 mg/m3
——
X
Acrylic acid
79-10-7
10 ppm
20 ppm
——
X
Acrylonitrile (Vinyl cyanide)
107-13-1
2 ppm
10 ppm
——
——
Aldrin
309-00-2
0.25 mg/m3
0.75 mg/m3
——
X
Allyl alcohol
107-18-6
2 ppm
4 ppm
——
X
Allyl chloride
107-05-1
1 ppm
2 ppm
——
——
Allyl glycidyl ether (AGE)
106-92-3
5 ppm
10 ppm
——
——
Allyl propyl disulfide
2179-59-1
2 ppm
3 ppm
——
——
alpha-Alumina (Aluminum oxide)
1344-28-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Aluminum (as Al)
7429-90-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Pyro powders
——
5 mg/m3
10 mg/m3
——
——
Welding fumes
——
5 mg/m3
10 mg/m3
——
——
Soluble salts
——
2 mg/m3
4 mg/m3
——
——
Alkyls (NOC)
——
2 mg/m3
4 mg/m3
——
——
Aluminum oxide (Alundum, Corundum)
7429-90-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
4-Aminodiphenyl
92-67-1
——
——
——
——
2-Aminoethanol (Ethanolamine)
141-43-5
3 ppm
6 ppm
——
——
2-Aminopyridine
504-29-0
0.5 ppm
1.5 ppm
——
——
Amitrole
61-82-5
0.2 mg/m3
0.6 mg/m3
——
——
Ammonia
7664-41-7
25 ppm
35 ppm
——
——
Ammonium chloride, fume
12125-02-9
10 mg/m3
20 mg/m3
——
——
Ammonium sulfamate (Ammate)
7773-06-0
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5.0 mg/m3
10 mg/m3
——
——
n-Amyl acetate
628-63-7
100 ppm
150 ppm
——
——
sec-Amyl acetate
626-38-0
125 ppm
156 ppm
——
——
Aniline and homologues
62-53-3
2 ppm
4 ppm
——
X
Anisidine (o, p-isomers)
29191-52-4
0.1 ppm
0.3 ppm
——
X
Antimony and compounds (as Sb)
7440-36-0
0.5 mg/m3
1.5 mg/m3
——
——
ANTU (alpha Naphthyl thiourea)
86-88-4
0.3 mg/m3
0.9 mg/m3
——
——
Argon
7440-37-1
Simple asphyxiant
——
——
——
Arsenic, organic compounds (as As)
7440-38-2
0.2 mg/m3
0.6 mg/m3
——
——
Arsenic, inorganic compounds (as As)
(when use is covered by
WAC 296-62-07347)
7440-38-2
0.01 mg/m3
——
——
——
Arsenic, inorganic compounds (as As)
(when use is not covered by WAC
296-62-07347)
7440-38-2
0.2 mg/m3
0.6 mg/m3
——
——
Arsine
7784-42-1
0.05 ppm
0.15 ppm
——
——
Asbestos
——
——
——
——
——
Asphalt (Petroleum fumes)
8052-42-4
5 mg/m3
10 mg/m3
——
——
Atrazine
1912-24-9
5 mg/m3
10 mg/m3
——
——
Azinphos methyl (Guthion)
86-50-0
0.2 mg/m3
0.6 mg/m3
——
X
Azodrin (Monocrotophos)
6923-22-4
0.25 mg/m3
0.75 mg/m3
——
——
Barium, soluble compounds (as Ba)
7440-39-3
0.5 mg/m3
1.5 mg/m3
——
——
Barium sulfate
7727-43-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Baygon (Propoxur)
114-26-1
0.5 mg/m3
1.5 mg/m3
——
——
Benomyl
17804-35-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Benzene
71-43-2
1 ppm
5 ppm
——
——
Benzidine
92-87-5
——
——
——
——
p-Benzoquinone (Quinone)
106-51-4
0.1 ppm
0.3 ppm
——
——
Benzo(a) pyrene (Coal tar pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
——
——
Benzoyl peroxide
94-36-0
5 mg/m3
10 mg/m3
——
——
Benzyl chloride
100-44-7
1ppm
3 ppm
——
——
Beryllium and beryllium
compounds (as Be)
(See WAC 296-62-085)
7440-41-7
((0.002)) 0.0002 mg/m3
((0.005)) 0.002 mg/m3
(30 min.)
((0.025)) 0.02 mg/m3
——
Biphenyl (Diphenyl)
92-52-4
0.2 ppm
0.6 ppm
——
——
Bismuth telluride, undoped
1304-82-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Bismuth telluride, Se-doped
——
5 mg/m3
10 mg/m3
——
——
Borates, tetra, sodium salts
——
——
——
——
——
Anhydrous
1330-43-4
1 mg/m3
3 mg/m3
——
——
Decahydrate
1303-96-4
5 mg/m3
10 mg/m3
——
——
Pentahydrate
12179-04-3
1 mg/m3
3 mg/m3
——
——
Boron oxide
1303-86-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Boron tribromide
10294-33-4
——
——
1 ppm
——
Boron trifluoride
6737-07-2
——
——
1 ppm
——
Bromacil
314-40-9
1 ppm
3 ppm
——
——
Bromine
7726-95-6
0.1 ppm
0.3 ppm
——
——
Bromine pentafluoride
7789-30-2
0.1 ppm
0.3 ppm
——
——
Bromochloromethane
(Chlorobromomthane)
74-97-5
200 ppm
250 ppm
——
——
Bromoform
15-25-2
0.5 ppm
1.5 ppm
——
X
Butadiene (1,3-butadiene)
106-99-0
1 ppm
5 ppm
——
——
Butane
106-97-8
800 ppm
1,000 ppm
——
——
Butanethiol (Butyl mercaptan)
109-79-5
0.5 ppm
1.5 ppm
——
——
2-Butanone (Methyl ethyl ketone)
78-93-3
200 ppm
300 ppm
——
——
2-Butoxy ethanol (Butyl cellosolve)
111-76-2
25 ppm
38 ppm
——
X
n-Butyl acetate
123-86-4
150 ppm
200 ppm
——
——
sec-Butyl acetate
105-46-4
200 ppm
250 ppm
——
——
tert-Butyl acetate
540-88-5
200 ppm
250 ppm
——
——
Butyl acrylate
141-32-2
10 ppm
20 ppm
——
——
n-Butyl alcohol
71-36-3
——
——
50 ppm
X
sec-Butyl alcohol
78-92-2
100 ppm
150 ppm
——
——
tert-Butyl alcohol
75-65-0
100 ppm
150 ppm
——
——
Butylamine
109-73-9
——
——
5 ppm
X
Butyl cellosolve (2-Butoxy ethanol)
111-76-2
25 ppm
38 ppm
——
——
tert-Butyl chromate (as CrOs)
1189-85-1
——
——
0.1 mg/m3
X
n-Butyl glycidyl ether (BGE)
2426-08-6
25 ppm
38 ppm
——
——
n-Butyl lactate
138-22-7
5 ppm
10 ppm
—-
——
Butyl mercaptan
109-79-5
0.5 ppm
1.5 ppm
——
——
o-sec-Butylphenol
89-72-5
5 ppm
10 ppm
——
X
p-tert-Butyl-toluene
98-51-1
10 ppm
20 ppm
——
——
Cadmium oxide fume (as Cd)
1306-19-0
0.005 mg/m3
——
——
——
Cadmium dust and salts (as Cd)
7440-43-9
0.005 mg/m3
——
——
——
Calcium arsenate
——
0.01 mg/m3
——
——
——
Calcium carbonate
1317-65-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Calcium cyanamide
156-62-7
0.5 mg/m3
1.5 mg/m3
——
——
Calcium hydroxide
1305-62-0
5 mg/m3
10 mg/m3
——
——
Calcium oxide
1305-78-8
2 mg/m3
4 mg/m3
——
——
Calcium silicate
1344-95-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Calcium sulfate
7778-18-9
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Camphor (synthetic)
76-22-2
2 mg/m3
4 mg/m3
——
——
Caprolactam
105-60-2
——
——
——
——
Dust
——
1 mg/m3
3 mg/m3
——
——
Vapor
——
5 ppm
10 ppm
——
——
Captafol (Difolatan)
2425-06-1
0.1 mg/m3
0.3 mg/m3
——
X
Captan
133-06-2
5 mg/m3
10 mg/m3
——
——
Carbaryl (Sevin)
63-25-2
5 mg/m3
10 mg/m3
——
——
Carbofuran (Furadon)
1563-66-2
0.1 mg/m3
0.3 mg/m3
——
——
Carbon black
1333-86-4
3.5 mg/m3
7 mg/m3
——
——
Carbon dioxide
124-38-9
5,000 ppm
30,000 ppm
——
——
Carbon disulfide
75-15-0
4 ppm
12 ppm
——
X
Carbon monoxide
630-08-0
35 ppm
200 ppm (5 min.)
1,500 ppm
——
Carbon tetrabromide
558-13-4
0.1 ppm
0.3 ppm
——
——
Carbon tetrachloride
(Tetrachloromethane)
56-23-5
2 ppm
4 ppm
——
X
Carbonyl chloride (Phosgene)
7803-51-2
0.1 ppm
0.3 ppm
——
——
Carbonyl fluoride
353-50-4
2 ppm
5 ppm
——
——
Catechol (Pyrocatechol)
120-80-9
5 ppm
10 ppm
——
X
Cellosolve acetate
(2-Ethoxyethylacetate)
111-15-9
5 ppm
10 ppm
——
X
Cellulose (paper fiber)
9004-34-6
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Cesium hydroxide
21351-79-1
2 mg/m3
4 mg/m3
——
——
Chlordane
57-74-9
0.5 mg/m3
1.5 mg/m3
——
X
Chlorinated camphene (Toxaphen)
8001-35-2
0.5 mg/m3
1 mg/m3
——
X
Chlorinated diphenyl oxide
55720-99-5
0.5 mg/m3
1.5 mg/m3
——
——
Chlorine
7782-50-5
0.5 ppm
——
1 ppm
——
Chlorine dioxide
10049-04-4
0.1 ppm
0.3 ppm
——
——
Chlorine trifluoride
7790-91-2
——
——
0.1 ppm
——
Chloroacetaldehyde
107-20-0
——
——
1 ppm
——
a-Chloroacetophenone
(Phenacyl chloride)
532-21-4
0.05 ppm
0.15 ppm
——
——
Chloroacetyl chloride
79-04-9
0.05 ppm
0.15 ppm
——
——
Chlorobenzene (Monochlorobenzene)
108-90-7
75 ppm
113 ppm
——
——
o-Chlorobenzylidene
malononitrile (OCBM)
2698-41-1
——
——
0.05 ppm
X
Chlorobromomethane
74-97-5
200 ppm
250 ppm
——
——
2-Chloro-1, 3-butadiene
(beta-Chloroprene)
126-99-8
10 ppm
20 ppm
——
X
Chlorodifluoromethane
75-45-6
1,000 ppm
1,250 ppm
——
——
Chlorodiphenyl (42% Chlorine) (PCB)
(Polychlorobiphenyls)
53469-21-9
1 mg/m3
3 mg/m3
——
X
Chlorodiphenyl (54% Chlorine)
(Polychlorobiphenyls (PCB))
11097-69-1
0.5 mg/m3
1.5 mg/m3
——
X
1-Chloro-2, 3-epoxypropane
(Epichlorhydrin)
106-89-8
2 ppm
4 ppm
——
X
2-Chloroethanol (Ethylene chlorohydrin)
107-07-3
——
——
1 ppm
X
Chloroethylene (vinyl chloride)
75-01-4
1 ppm
5 ppm
——
——
Chloroform (Trichloromethane)
67-66-3
2 ppm
4 ppm
——
——
1-Chloro-1-nitropropane
600-25-9
2 ppm
4 ppm
——
——
bis-Chloromethyl ether
542-88-1
——
——
——
——
Chloromethyl methyl ether
(Methyl chloromethyl ether)
107-30-2
——
——
——
——
Chloropentafluoroethane
76-15-3
1,000 ppm
1,250 ppm
——
——
Chloropicrin (Nitrotrichloromethane)
76-06-2
0.1 ppm
0.3 ppm
——
——
beta-Chloroprene (2-Chloro-1,
3-butadiene)
126-99-8
10 ppm
20 ppm
——
X
o-Chlorostyrene
2039-87-4
50 ppm
75 ppm
——
——
o-Chlorotoluene
95-49-8
50 ppm
75 ppm
——
——
2-Chloro-6-trichloromethyl
pyridine (Nitrapyrin)
1929-82-4
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Chlorpyrifos
2921-88-2
0.2 mg/m3
0.6 mg/m3
——
X
Chromic acid and chromates
(as CrO3)
Varies with
compound
0.1 mg/m3
0.3 mg/m3
——
——
Chromium, soluble, chromic and
chromous salts (as Cr)
7440-47-3
0.5 mg/m3
1.5 mg/m3
——
——
Chromium (VI) compounds (as Cr)
——
0.05 mg/m3
0.15 mg/m3
——
——
Chromium metal and insoluble salts
7440-47-3
0.5 mg/m3
1.5 mg/m3
——
——
Chromyl chloride
14977-61-8
0.025 ppm
0.075 ppm
——
——
Chrysene (Coal tar pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
——
——
Clopidol
2971-90-6
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Coal dust (less than 5% SiO2)
——
——
——
——
——
Respirable fraction
——
2 mg/m3
4 mg/m3
——
——
Coal dust (greater than or
equal to 5% SiO2)
——
——
——
——
——
Respirable fraction
——
0.1 mg/m3
0.3 mg/m3
——
——
Coal tar pitch volatiles
(benzene soluble fraction)
(Particulate polycyclic
aromatic hydrocarbons)
65996-93-2
0.2 mg/m3
0.6 mg/m3
——
——
Cobalt, metal fume & dust (as Co)
7440-48-4
0.05 mg/m3
0.15 mg/m3
——
——
Cobalt carbonyl (as Co)
10210-68-1
0.1 mg/m3
0.3 mg/m3
——
——
Cobalt hydrocarbonyl (as Co)
16842-03-8
0.1 mg/m3
0.3 mg/m3
——
——
Coke oven emissions
——
0.15 mg/m3
——
——
——
Copper (as Cu)
7440-50-8
——
——
——
——
Fume
——
0.1 mg/m3
0.3 mg/m3
——
——
Dusts and mists
——
1 mg/m3
3 mg/m3
——
——
Cotton dust (raw) (waste sorting, blending, cleaning, willowing and garetting)
——
1 mg/m3
——
——
——
Corundum (Aluminum oxide)
7429-90-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Crag herbicide (Sesone, Sodium-2,
4-dichloro-phenoxyethyl sulfate)
136-78-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Cresol (all isomers)
1319-77-3
5 ppm
10 ppm
——
X
Crotonaldehyde
 
123-73-9;
4170-30-3
2 ppm
4 ppm
——
——
Crufomate
299-86-5
5 mg/m3
10 mg/m3
——
——
Cumene
98-82-8
50 ppm
75 ppm
——
X
Cyanamide
420-04-2
2 mg/m3
4 mg/m3
——
——
Cyanide (as CN)
Varies with
compound
5 mg/m3
10 mg/m3
——
X
Cyanogen
460-19-5
10 ppm
20 ppm
——
——
Cyanogen chloride
506-77-4
——
——
0.3 ppm
——
Cyclohexane
110-82-7
300 ppm
375 ppm
——
——
Cyclohexanol
108-93-0
50 ppm
75 ppm
——
X
Cyclohexanone
108-94-1
25 ppm
38 ppm
——
X
Cyclohexene
110-83-8
300 ppm
375 ppm
——
——
Cyclohexylamine
108-91-8
10 ppm
20 ppm
——
——
Cyclonite (RDX)
121-82-4
1.5 mg/m3
3.0 mg/m3
——
X
Cyclopentadiene
542-92-7
75 ppm
113 ppm
——
——
Cyclopentane
287-92-3
600 ppm
750 ppm
——
——
Cyhexatin (Tricyclohexyltin hydroxide)
13121-70-5
5 mg/m3
10 mg/m3
——
——
2,4-D (Dichlorophenoxy-acetic acid)
94-75-7
10 mg/m3
20 mg/m3
——
——
DBCP (1,2-Dibromo-3-chloropropane)
96-12-8
0.001 ppm
——
0.005 ppm
——
DDT (Dichlorodiphenyltri-chloroethane)
50-29-3
1 mg/m3
3 mg/m3
——
X
DDVP, (Dichlorvos)
62-73-7
0.1 ppm
0.3 ppm
——
X
Dasanit (Fensulfothion)
115-90-2
0.1 mg/m3
0.3 mg/m3
——
——
Decaborane
17702-41-9
0.05 ppm
0.15 ppm
——
X
Demeton
8065-48-3
0.01 ppm
0.03 ppm
——
X
Diacetone alcohol (4-hydroxy-4-methyl-
2-pentanone)
123-42-2
50 ppm
75 ppm
——
——
1, 2-Diaminoethane (Ethylenediamine)
107-15-3
10 ppm
20 ppm
——
——
Diazinon
333-41-5
0.1 mg/m3
0.3 mg/m3
——
X
Diazomethane
334-88-3
0.2 ppm
0.6 ppm
——
——
Diborane
19287-45-7
0.1 ppm
0.3 ppm
——
——
Dibrom (see Naled)
300-76-5
3 mg/m3
6 mg/m3
——
X
1, 2-Dibromo-3-chloropropane (DBCP)
96-12-8
0.001 ppm
——
0.005 ppm
——
2-N-Dibutylamino ethanol
102-81-8
2 ppm
4 ppm
——
X
Dibutyl phosphate
107-66-4
1 ppm
2 ppm
——
——
Dibutyl phthalate
84-74-2
5 mg/m3
10 mg/m3
——
——
Dichloroacetylene
7572-29-4
——
——-
0.1 ppm
——
o-Dichlorobenzene
95-50-1
——
——
50 ppm
——
p-Dichlorobenzene
106-46-7
75 ppm
110 ppm
——
——
3, 3'-Dichlorobenzidine
91-94-1
——
——
——
——
Dichlorodiphenyltri-chloroethane (DDT)
50-29-3
1 mg/m3
3 mg/m3
——
X
Dichlorodifluoromethane
75-71-8
1,000 ppm
1,250 ppm
——
——
1, 3-Dichloro-5, 5-dimethyl hydantoin
118-52-5
0.2 mg/m3
0.4 mg/m3
——
——
1, 1-Dichloroethane (Ethylidine chloride)
75-34-3
100 ppm
150 ppm
——
——
1, 2-Dichloroethane
(Ethylene dichloride)
107-06-2
1 ppm
2 ppm
——
——
1, 1-Dichloroethylene
(Vinylidene chloride)
75-35-4
1 ppm
3 ppm
——
——
1, 2-Dichloroethylene (Acetylene
dichloride)
540-59-0
200 ppm
250 ppm
——
——
Dichloroethyl ether
111-44-4
5 ppm
10 ppm
——
X
Dichlorofluoromethane
75-43-4
10 ppm
20 ppm
——
——
Dichloromethane (Methylene chloride)
75-09-2
25 ppm
125 ppm
——
——
1, 1-Dichloro-1-nitroethane
594-72-9
2 ppm
10 ppm
——
——
Dichlorophenoxyacetic acid (2, 4-D)
94-75-7
10 mg/m3
20 mg/m3
——
——
1, 2-Dichloropropane
(Propylene dichloride)
78-87-5
75 ppm
110 ppm
——
——
Dichloropropene
542-75-6
1 ppm
3 ppm
——
X
2, 2-Dichloropropionic acid
75-99-0
1 ppm
3 ppm
——
——
Dichlorotetrafluoroethane
76-14-2
1,000 ppm
1,250 ppm
——
——
Dichlorvos (DDVP)
62-73-7
0.1 ppm
0.3 ppm
——
X
Dicrotophos
141-66-2
0.25 mg/m3
0.75 mg/m3
——
X
Dicyclopentadiene
77-73-6
5 ppm
10 ppm
——
——
Dicyclopentadienyl iron
102-54-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Dieldrin
60-57-1
0.25 mg/m3
0.75 mg/m3
——
X
Diethanolamine
111-42-2
3 ppm
6 ppm
——
——
Diethylamine
109-89-7
10 ppm
25 ppm
——
——
2-Diethylaminoethanol
100-37-8
10 ppm
20 ppm
——
X
Diethylene triamine
111-40-0
1 ppm
3 ppm
——
X
Diethyl ether (Ethyl ether)
60-29-7
400 ppm
500 ppm
——
——
Diethyl ketone
96-22-0
200 ppm
250 ppm
——
——
Diethyl phthalate
84-66-2
5 mg/m3
10 mg/m3
——
——
Difluorodibromomethane
75-61-6
100 ppm
150 ppm
——
——
Difolatan (Captafol)
2425-06-1
0.1 mg/m3
0.3 mg/m3
——
X
Diglycidyl ether (DGE)
2238-07-5
0.1 ppm
0.3 ppm
——
——
Dihydroxybenzene (Hydroquinone)
123-31-9
2 mg/m3
4 mg/m3
——
——
Diisobutyl ketone (2, 6-
Dimethylheptanone)
108-83-8
25 ppm
38 ppm
——
——
Diisopropylamine
108-18-9
5 ppm
10 ppm
——
X
Dimethoxymethane (Methylal)
109-87-5
1,000 ppm
1,250 ppm
——
——
Dimethyl acetamide
127-19-5
10 ppm
20 ppm
——
X
Dimethylamine
124-40-3
10 ppm
20 ppm
——
——
4-Dimethylaminoazo benzene
60-11-7
——
——
——
——
Dimethylaminobenzene (Xylidene)
1300-73-8
2 ppm
4 ppm
——
X
Dimethylaniline (N, N-Dimethylaniline)
121-69-7
5 ppm
10 ppm
——
X
Dimethylbenzene (Xylene)
1300-73-8
100 ppm
150 ppm
——
——
Dimethyl-1, 2-dibromo-2,
2-dichloroethyl phosphate (Naled)
300-76-5
3 mg/m3
6 mg/m3
——
X
Dimethylformamide
68-12-2
10 ppm
20 ppm
——
X
2, 6-Dimethylheptanone
(Diisobutyl ketone)
108-83-8
25 ppm
38 ppm
——
——
1, 1-Dimethylhydrazine
57-14-7
0.5 ppm
1.5 ppm
——
X
Dimethyl phthalate
131-11-3
5 mg/m3
10 mg/m3
——
——
Dimethyl sulfate
77-78-1
0.1 ppm
0.3 ppm
——
X
Dinitolmide (3, 5-Dinitro-o-toluamide)
148-01-6
5 mg/m3
10 mg/m3
——
——
Dinitrobenzene (all isomers -
alpha, meta and para)
528-29-0;
99-65-0;
100-25-4
0.15 ppm
0.45 ppm
——
X
Dinitro-o-cresol
534-52-1
0.2 mg/m3
0.6 mg/m3
——
X
3, 5-Dinitro-o-toluamide (Dinitolmide)
148-01-6
5 mg/m3
10 mg/m3
——
——
Dinitrotoluene
25321-14-6
1.5 mg/m3
3 mg/m3
——
X
Dioxane (Diethylene dioxide)
123-91-1
25 ppm
38 ppm
——
X
Dioxathion
78-34-2
0.2 mg/m3
0.6 mg/m3
——
X
Diphenyl (Biphenyl)
92-52-4
0.2 ppm
0.6 ppm
——
——
Diphenylamine
122-39-4
10 mg/m3
20 mg/m3
——
——
Diphenylmethane diisocyanate
(Methylene bisphenyl
isocyanate (MDI))
101-68-8
——
——
0.02 ppm
——
Dipropylene glycol methyl ether
34590-94-8
100 ppm
150 ppm
——
X
Dipropyl ketone
123-19-3
50 ppm
75 ppm
——
——
Diquat
85-00-7
0.5 mg/m3
1.5 mg/m3
——
——
Di-sec, Octyl phthalate
(Di-2-ethylhexylphthalate)
117-81-7
5 mg/m3
10 mg/m3
——
——
Disulfram
97-77-8
2 mg/m3
4 mg/m3
——
——
Disulfoton
298-04-4
0.1 mg/m3
0.3 mg/m3
——
X
2, 6-Di-tert-butyl-p-cresol
128-37-0
10 mg/m3
20 mg/m3
——
——
Diuron
330-54-1
10 mg/m3
20 mg/m3
——
——
Divinyl benzene
1321-74-0
10 ppm
20 ppm
——
——
Emery
12415-34-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Endosulfan (Thiodan)
115-29-7
0.1 mg/m3
0.3 mg/m3
——
X
Endrin
72-20-8
0.1 mg/m3
0.3 mg/m3
——
X
Epichlorhydrin (1-Chloro-2,
3-epoxypropane)
106-89-8
2 ppm
4 ppm
——
X
EPN
2104-64-5
0.5 mg/m3
1.5 mg/m3
——
X
1, 2-Epoxypropane (Propylene oxide)
75-56-9
20 ppm
30 ppm
——
——
2, 3-Epoxy-1-propanol (Glycidol)
556-52-5
25 ppm
38 ppm
——
——
Ethane
——
Simple asphyxiant
——
——
——
Ethanethiol (Ethyl mercaptan)
75-08-1
0.5 ppm
1.5 ppm
——
——
Ethanol (Ethyl alcohol)
64-17-5
1,000 ppm
1,250 ppm
——
——
Ethanolamine (2-Aminoethanol)
141-43-5
3 ppm
6 ppm
——
——
Ethion
563-12-2
0.4 mg/m3
1.2 mg/m3
——
X
2-Ethoxyethanol (Glycol
monoethyl ether)
110-80-5
5 ppm
10 ppm
——
X
2-Ethoxyethyl acetate
(Cellosolve acetate)
111-15-9
5 ppm
10 ppm
——
X
Ethyl acetate
141-78-6
400 ppm
500 ppm
——
——
Ethyl acrylate
140-88-5
5 ppm
25 ppm
——
X
Ethyl alcohol (ethanol)
64-17-5
1,000 ppm
1,250 ppm
——
——
Ethylamine
75-04-07
10 ppm
20 ppm
——
——
Ethyl amyl ketone
(5-Methyl-3-hepatone)
541-85-5
25 ppm
38 ppm
——
——
Ethyl benzene
100-41-4
100 ppm
125 ppm
——
——
Ethyl bromide
74-96-4
200 ppm
250 ppm
——
——
Ethyl butyl ketone (3-Heptanone)
106-35-4
50 ppm
75 ppm
——
——
Ethyl chloride
75-00-3
1,000 ppm
1,250 ppm
——
——
Ethylene
74-85-1
Simple asphyxiant
——
——
——
Ethylene chlorohydrin (2-Chloroethanol)
107-07-3
——
——
1 ppm
X
Ethylenediamine (1,2-Diaminoethane)
107-15-3
10 ppm
20 ppm
——
X
Ethylene dibromide
106-93-4
0.1 ppm
0.5 ppm
——
——
Ethylene dichloride (1,2-Dichloroethane)
107-06-2
1 ppm
2 ppm
——
——
Ethylene glycol
107-21-1
——
——
50 ppm
——
Ethylene glycol dinitrate
628-96-6
——
0.1 mg/m3
——
X
Ethylene glycol monomethyl ether
acetate (Methyl cellosolve
acetate)
——
5 ppm
10 ppm
——
X
Ethyleneimine
151-56-4
——
——
——
X
Ethylene oxide
75-21-8
1 ppm
5 ppm
——
——
Ethyl ether (Diethyl ether)
60-29-7
400 ppm
500 ppm
——
——
Ethyl formate
109-94-4
100 ppm
125 ppm
——
——
Ethylidine chloride (1, 1-Dichloroethane)
107-06-2
1 ppm
2 ppm
——
——
Ethylidene norbornene
16219-75-3
——
——
5.0 ppm
——
Ethyl mercaptan (Ethanethiol)
75-08-1
0.5 ppm
1.5 ppm
——
——
n-Ethylmorpholine
100-74-3
5 ppm
10 ppm
——
X
Ethyl sec-amyl ketone
(5-methyl-3-heptanone)
541-85-5
25 ppm
38 ppm
——
——
Ethyl silicate
78-10-4
10 ppm
20 ppm
——
——
Fenamiphos
22224-92-6
0.1 mg/m3
0.3 mg/m3
——
X
Fensulfothion (Dasanit)
115-90-2
0.1 mg/m3
0.3 mg/m3
——
——
Fenthion
55-38-9
0.2 mg/m3
0.6 mg/m3
——
X
Ferbam
——
——
——
——
——
Total particulate
14484-64-1
10 mg/m3
20 mg/m3
——
——
Ferrovanadium dust
12604-58-9
1 mg/m3
3 mg/m3
——
——
Fluorides (as F)
Varies with
compound
2.5 mg/m3
5 mg/m3
——
——
Fluorine
7782-41-4
0.1 ppm
0.3 ppm
——
——
Fluorotrichloromethane
(see Trichlorofluoro methane)
75-69-4
——
——
1,000 ppm
——
Fonofos
944-22-9
0.1 mg/m3
0.3 mg/m3
——
X
Formaldehyde
50-00-0
0.75 ppm
2 ppm
——
——
Formamide
75-12-7
20 ppm
30 ppm
——
——
Formic acid
64-18-6
5 ppm
10 ppm
——
——
Furadon (carbofuran)
1563-66-2
0.1 mg/m3
0.3 mg/m3
——
——
Furfural
98-01-1
2 ppm
4 ppm
——
X
Furfuryl alcohol
98-00-0
10 ppm
15 ppm
——
X
Gasoline
8006-61-9
300 ppm
500 ppm
——
——
Germanium tetrahydride
7782-65-2
0.2 ppm
0.6 ppm
——
——
Glass, fibrous or dust
——
10 mg/m3
20 mg/m3
——
——
Gluteraldehyde
111-30-8
——
——
0.2 ppm
——
Glycerin mist
56-81-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Glycidol (2, 3-Epoxy-1-propanol)
556-52-5
25 ppm
38 ppm
——
——
Glycol monoethyl ether
(2-Ethoxyethanol)
110-80-5
5 ppm
10 ppm
——
X
Grain dust (oat, wheat, barley)
——
10 mg/m3
20 mg/m3
——
——
Graphite, natural
7782-42-5
——
——
——
——
Respirable particulate
——
2.5 mg/m3
5 mg/m3
——
——
Graphite, synthetic
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Guthion (Azinphosmethyl)
86-50-0
0.2 mg/m3
0.6 mg/m3
——
X
Gypsum
13397-24-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Hafnium
7440-58-6
0.5 mg/m3
1.5 mg/m3
——
——
Helium
——
Simple asphyxiant
——
——
——
Heptachlor
76-44-8
0.5 mg/m3
1.5 mg/m3
——
X
Heptane (n-heptane)
142-82-5
400 ppm
500 ppm
——
——
2-Heptanone (Methyl n-amyl ketone)
110-43-0
50 ppm
75 ppm
——
——
3-Heptanone (Ethyl butyl ketone)
106-35-4
50 ppm
75 ppm
——
——
Hexachlorobutadiene
87-68-3
0.02 ppm
0.06 ppm
——
X
Hexachlorocyclopentadiene
77-47-4
0.01 ppm
0.03 ppm
——
——
Hexachloroethane
67-72-1
1 ppm
3 ppm
——
X
Hexachloronaphthalene
1335-87-1
0.2 mg/m3
0.6 mg/m3
——
X
Hexafluoroacetone
684-16-2
0.1 ppm
0.3 ppm
——
X
Hexane
——
——
——
——
——
n-hexane
110-54-3
50 ppm
75 ppm
——
——
other isomers
Varies with
compound
500 ppm
1,000 ppm
——
——
2-Hexanone (Methyl-n-butyl ketone)
591-78-6
5 ppm
10 ppm
——
——
Hexone (Methyl isobutyl ketone)
108-10-1
50 ppm
75 ppm
——
——
sec-Hexyl acetate
108-84-9
50 ppm
75 ppm
——
——
Hexylene glycol
107-41-5
——
——
25 ppm
——
Hydrazine
302-01-2
0.1 ppm
0.3 ppm
——
X
Hydrogen
——
Simple asphyxiant
——
——
——
Hydrogenated terphenyls
61788-32-7
0.5 ppm
1.5 ppm
——
——
Hydrogen bromide
10035-10-6
——
——
3.0 ppm
——
Hydrogen chloride
7647-01-0
——
——
5.0 ppm
——
Hydrogen cyanide
74-90-8
——
4.7 ppm
——
X
Hydrogen fluoride
7664-39-3
——
——
3 ppm
——
Hydrogen peroxide
7722-84-1
1 ppm
3 ppm
——
——
Hydrogen selenide (as Se)
7783-07-5
0.05 ppm
0.15 ppm
——
——
Hydrogen sulfide
7783-06-4
10 ppm
15 ppm
——
——
Hydroquinone (Dihydroxybenzene)
123-31-9
2 mg/m3
4 mg/m3
——
——
4-Hydroxy-4-methyl-2-pentanone
(Diacetone alcohol)
123-42-2
50 ppm
75 ppm
——
——
2-Hydroxypropyl acrylate
99-61-1
0.5 ppm
1.5 ppm
——
X
Indene
95-13-6
10 ppm
20 ppm
——
——
Indium and compounds (as In)
7440-74-6
0.1 mg/m3
0.3 mg/m3
——
——
Iodine
7553-56-2
——
——
0.1 ppm
——
Iodoform
75-47-8
0.6 ppm
1.8 ppm
——
——
Iron oxide dust and fume (as Fe)
1309-37-1
——
——
——
——
Total particulate
——
5 mg/m3
10 mg/m3
——
——
Iron pentacarbonyl (as Fe)
13463-40-6
0.1 ppm
0.2 ppm
——
——
Iron salts, soluble (as Fe)
Varies with
compound
1 mg/m3
3 mg/m3
——
——
Isoamyl acetate
123-92-2
100 ppm
150 ppm
——
——
Isoamyl alcohol (primary and secondary)
123-51-3
100 ppm
125 ppm
——
——
Isobutyl acetate
110-19-0
150 ppm
188 ppm
——
——
Isobutyl alcohol
78-83-1
50 ppm
75 ppm
——
——
Isooctyl alcohol
26952-21-6
50 ppm
75 ppm
——
X
Isophorone
78-59-1
4 ppm
——
5 ppm
——
Isophorone diisocyanate
4098-71-9
0.005 ppm
0.02 ppm
——
X
Isopropoxyethanol
109-59-1
25 ppm
38 ppm
——
——
Isopropyl acetate
108-21-4
250 ppm
310 ppm
——
——
Isopropyl alcohol
67-63-0
400 ppm
500 ppm
——
——
Isopropylamine
75-31-0
5 ppm
10 ppm
——
——
N-Isopropylaniline
768-52-5
2 ppm
4 ppm
——
X
Isopropyl ether
108-20-3
250 ppm
313 ppm
——
——
Isopropyl glycidyl ether (IGE)
4016-14-2
50 ppm
75 ppm
——-
——
Kaolin
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Ketene
463-51-4
0.5 mg/m3
1.5 mg/m3
——
——
Lannate (Methomyl)
16752-77-5
2.5 mg/m3
5 mg/m3
——
——
Lead, inorganic (as Pb)
7439-92-1
0.05 mg/m3
——
——
——
Lead arsenate (as Pb)
3687-31-8
0.05 mg/m3
——
——
——
Lead chromate (as Pb)
7758-97-6
0.05 mg/m3
——
——
——
Limestone
1317-65-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Lindane
58-89-9
0.5 mg/m3
1.5 mg/m3
——
X
Lithium hydride
7580-67-8
0.025 mg/m3
0.075 mg/m3
——
——
L.P.G. (liquified petroleum gas)
68476-85-7
1,000 ppm
1,250 ppm
——
——
Magnesite
546-93-0
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Magnesium oxide fume
1309-48-4
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Malathion
121-75-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
X
Maleic anhydride
108-31-6
0.25 ppm
0.75 ppm
——
——
Manganese and compounds (as Mn)
7439-96-5
——
——
5 mg/m3
——
Manganese cyclopentadienyl
tricarbonyl (as Mn)
12079-65-1
0.1 mg/m3
0.3 mg/m3
——
X
Manganese tetroxide and fume (as Mn)
7439-96-5
1 mg/m3
3 mg/m3
——
——
Marble
1317-65-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
MBOCA (4, 4'-Methylene bis
(2-chloro-aniline))
101-14-4
——
——
——
X
MDA
(4, 4-Methylene dianiline)
101-77-9
0.01 ppm
0.1 ppm
——
X
MDI (Methylene bisphenyl isocyanate)
(Diphenylmethane diisocyanate)
101-68-8
——
——
0.02 ppm
——
MEK
(Methyl ethyl ketone)
(2-Butanone)
78-93-3
200 ppm
300 ppm
——
——
MEKP
(Methyl ethyl ketone peroxide)
1338-23-4
——
——
0.2 ppm
——
Mercury (as Hg)
7439-97-6
——
——
——
——
Aryl and inorganic
——
0.1 mg/m3
0.3 mg/m3
——
X
Organo-alkyl compounds
——
0.01 mg/m3
0.03 mg/m3
——
X
Vapor
——
0.05 mg/m3
0.15 mg/m3
——
X
Mesityl oxide
141-79-7
15 ppm
25 ppm
——
——
Methacrylic acid
79-41-4
20 ppm
30 ppm
——
X
Methane
——
Simple asphyxiant
——
——
——
Methanethiol (Methyl mercaptan)
74-93-1
0.5 ppm
1.5 ppm
——
——
Methanol (Methyl alcohol)
67-56-1
200 ppm
250 ppm
——
X
Methomyl (lannate)
16752-77-5
2.5 mg/m3
5 mg/m3
——
——
Methoxychlor
72-43-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
2-Methoxyethanol (Methyl cellosolve)
109-86-4
5 ppm
10 ppm
——
X
2-Methoxyethyl acetate
(Methyl cellosolve acetate)
110-49-6
5 ppm
10 ppm
——
X
4-Methoxyphenol
150-76-5
5 mg/m3
10 mg/m3
——
——
Methyl acetate
79-20-9
200 ppm
250 ppm
——
——
Methyl acetylene (propyne)
74-99-7
1,000 ppm
1,250 ppm
——
——
Methyl acetylene-propadiene
mixture (MAPP)
——
1,000 ppm
1,250 ppm
——
——
Methyl acrylate
96-33-3
10 ppm
20 ppm
——
X
Methylacrylonitrile
126-98-7
1 ppm
3 ppm
——
X
Methylal (Dimethoxy-methane)
109-87-5
1,000 ppm
1,250 ppm
——
——
Methyl alcohol (methanol)
67-56-1
200 ppm
250 ppm
——
X
Methylamine
74-89-5
10 ppm
20 ppm
——
——
Methyl amyl alcohol
(Methyl isobutyl carbinol)
108-11-2
25 ppm
40 ppm
——
X
Methyl n-amyl ketone (2-Heptanone)
110-43-0
50 ppm
75 ppm
——
——
N-Methyl aniline (Monomethyl aniline)
100-61-8
0.5 ppm
1.5 ppm
——
X
Methyl bromide
74-83-9
5 ppm
10 ppm
——
X
Methyl-n-butyl ketone (2-Hexanone)
591-78-6
5 ppm
10 ppm
——
——
Methyl cellosolve (2-Methoxyethanol)
109-86-4
5 ppm
10 ppm
——
X
Methyl cellosolve acetate
(2-Methoxyethyl acetate)
110-49-6
5 ppm
10 ppm
——
X
Methyl chloride
74-87-3
50 ppm
100 ppm
——
——
Methyl chloroform
(1, 1, 1-trichlorethane)
71-55-6
350 ppm
450 ppm
——
——
Methyl chloromethyl ether
(chloromethyl methyl ether)
107-30-2
——
——
——
——
Methyl 2-cyanoacrylate
137-05-3
2 ppm
4 ppm
——
——
Methylcyclohexane
108-87-2
400 ppm
500 ppm
——
——
Methylcyclohexanol
25639-42-3
50 ppm
75 ppm
——
——
Methylcyclohexanone
583-60-8
50 ppm
75 ppm
——
X
Methylcyclopentadienyl
manganese tricarbonyl (as Mn)
12108-13-3
0.2 mg/m3
0.6 mg/m3
——
X
Methyl demeton
8022-00-2
0.5 mg/m3
1.5 mg/m3
——
X
Methylene bisphenyl isocyanate (MDI)
(Diphenylmethane
diisocyanate)
101-68-8
——
——
0.02 ppm
——
4, 4'-Methylene bis
(2-chloro-aniline) (MBOCA)
101-14-4
——
——
——
X
Methylene bis (4-cyclohexylisocyanate)
5124-30-1
——
——
0.01 ppm
——
Methylene chloride (Dichloromethane)
75-09-2
25 ppm
125 ppm
——
——
4, 4-Methylene dianiline (MDA)
101-77-9
0.01 ppm
0.1 ppm
——
X
Methyl ethyl ketone (MEK)
(2-Butanone)
78-93-3
200 ppm
300 ppm
——
——
Methyl ethyl ketone peroxide (MEKP)
1338-23-4
——
——
0.2 ppm
——
Methyl formate
107-31-3
100 ppm
150 ppm
——
——
5-Methyl-3-heptanone
(Ethyl amyl ketone)
541-85-5
25 ppm
38 ppm
——
——
Methyl hydrazine
(Monomethyl hydrazine)
60-34-4
——
——
0.2 ppm
X
Methyl iodide
74-88-4
2 ppm
4 ppm
——
X
Methyl isoamyl ketone
110-12-3
50 ppm
75 ppm
——
——
Methyl isobutyl carbinol
(Methyl amyl alcohol)
108-11-2
25 ppm
40 ppm
——
X
Methyl isobutyl ketone (Hexone)
108-10-1
50 ppm
75 ppm
——
——
Methyl isocyanate
624-83-9
0.02 ppm
0.06 ppm
——
X
Methyl isopropyl ketone
563-80-4
200 ppm
250 ppm
——
——
Methyl mercaptan (Methanethiol)
74-93-1
0.5 ppm
1.5 ppm
——
——
Methyl methacrylate
80-62-6
100 ppm
150 ppm
——
——
Methyl parathion
298-00-0
0.2 mg/m3
0.6 mg/m3
——
X
Methyl propyl ketone (2-Pentanone)
107-87-9
200 ppm
250 ppm
——
——
Methyl silicate
684-84-5
1 ppm
3 ppm
——
——
alpha-Methyl styrene
98-83-9
50 ppm
100 ppm
——
——
Mevinphos (Phosdrin)
7786-34-7
0.01 ppm
0.03 ppm
——
X
Metribuzin
21087-64-9
5 mg/m3
10 mg/m3
——
——
Mica (Silicates) Respirable fraction
12001-26-2
3 mg/m3
6 mg/m3
——
——
Molybdenum (as Mo)
7439-98-7
——
——
——
——
Soluble compounds
——
5 mg/m3
10 mg/m3
——
——
Insoluble compounds
——
10 mg/m3
20 mg/m3
——
——
Monochlorobenzene (Chlorobenzene)
108-90-7
75 ppm
113 ppm
——
——
Monocrotophos (Azodrin)
6923-22-4
0.25 mg/m3
0.75 mg/m3
——
——
Monomethyl aniline (N-Methyl aniline)
100-61-8
0.5 ppm
1.5 ppm
——
X
Monomethyl hydrazine
——
——
——
0.2 ppm
——
Morpholine
110-91-8
20 ppm
30 ppm
——
X
Naled (Dibrom)
300-76-5
3 mg/m3
6 mg/m3
——
X
Naphtha
8030-30-6
100 ppm
150 ppm
——
X
Naphthalene
91-20-3
10 ppm
15 ppm
——
——
alpha-Naphthylamine
134-32-7
——
——
——
——
beta-Naphthylamine
91-59-8
——
——
——
——
Neon
7440-01-9
Simple asphyxiant
——
——
——
Nickel carbonyl (as Ni)
13463-39-3
0.001 ppm
0.003 ppm
——
——
Nickel (as Ni)
7440-02-0
——
——
——
——
Metal and insoluble compounds
——
1 mg/m3
3 mg/m3
——
——
Soluble compounds
——
0.1 mg/m3
0.3 mg/m3
——
——
Nicotine
54-11-5
0.5 mg/m3
1.5 mg/m3
——
X
Nitrapyrin (2-Chloro-6
trichloromethyl pyridine)
1929-82-4
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Nitric acid
7697-37-2
2 ppm
4 ppm
——
——
Nitric oxide
10102-43-9
25 ppm
38 ppm
——
——
p-Nitroaniline
100-01-6
3 mg/m3
6 mg/m3
——
X
Nitrobenzene
98-95-3
1 ppm
3 ppm
——
X
4-Nitrobiphenyl
92-93-3
——
——
——
——
p-Nitrochlorobenzene
100-00-5
0.5 mg/m3
1.5 mg/m3
——
X
4-Nitrodiphenyl
——
——
——
——
——
Nitroethane
79-24-3
100 ppm
150 ppm
——
——
Nitrogen
7727-37-9
Simple asphyxiant
——
——
——
Nitrogen dioxide
10102-44-0
——
1 ppm
——
——
Nitrogen oxide (Nitrous oxide)
10024-97-2
50 ppm
75 ppm
——
——
Nitrogen trifluoride
7783-54-2
10 ppm
20 ppm
——
——
Nitroglycerin
55-63-0
——
0.1 mg/m3
——
X
Nitromethane
75-52-5
100 ppm
150 ppm
——
——
1-Nitropropane
108-03-2
25 ppm
38 ppm
——
——
2-Nitropropane
79-46-9
10 ppm
20 ppm
——
——
N-Nitrosodimethylamine
62-75-9
——
——
——
——
Nitrotoluene
——
——
——
——
——
o-isomer
88-72-2
2 ppm
4 ppm
——
X
m-isomer
98-08-2
2 ppm
4 ppm
——
X
p-isomer
99-99-0
2 ppm
4 ppm
——
X
Nitrotrichloromethane (Chloropicrin)
76-06-2
0.1 ppm
0.3 ppm
——
——
Nitrous oxide (Nitrogen oxide)
10024-97-2
50 ppm
75 ppm
——
——
Nonane
111-84-2
200 ppm
250 ppm
——
——
Octachloronaphthalene
2234-13-1
0.1 mg/m3
0.3 mg/m3
——
X
Octane
111-65-9
300 ppm
375 ppm
——
——
Oil mist mineral (particulate)
8012-95-1
5 mg/m3
10 mg/m3
——
——
Osmium tetroxide (as Os)
20816-12-0
0.0002 ppm
0.0006 ppm
——
——
Oxalic acid
144-62-7
1 mg/m3
2 mg/m3
——
——
Oxygen difluoride
7783-41-7
——
——
0.05 ppm
——
Ozone
10028-15-6
0.1 ppm
0.3 ppm
——
——
Paper fiber (Cellulose)
9004-34-6
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Paraffin wax fume
8002-74-2
2 mg/m3
4 mg/m3
——
——
Paraquat
——
——
——
——
——
Respirable fraction
4685-14-7
0.1 mg/m3
0.3 mg/m3
——
X
 
1910-42-5
 
 
 
 
 
2074-50-2
 
 
 
 
Parathion
56-38-2
0.1 mg/m3
0.3 mg/m3
——
X
Particulate polycyclic
aromatic hydrocarbons
(benzene soluble fraction)
(coal tar pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
——
——
Particulates not otherwise regulated
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Pentaborane
19624-22-7
0.005 ppm
0.015 ppm
——
——
Pentachloronaphthalene
1321-64-8
0.5 mg/m3
1.5 mg/m3
——
X
Pentachlorophenol
87-86-5
0.5 mg/m3
1.5 mg/m3
——
X
Pentaerythritol
115-77-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Pentane
109-66-0
600 ppm
750 ppm
——
——
2-Pentanone (methyl propyl ketone)
107-87-9
200 ppm
250 ppm
——
——
Perchloroethylene (tetrachloroethylene)
127-18-4
25 ppm
38 ppm
——
——
Perchloromethyl mercaptan
594-42-3
0.1 ppm
0.3 ppm
——
——
Perchloryl fluoride
7616-94-6
3 ppm
6 ppm
——
——
Perlite
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Petroleum distillates
(Naptha, rubber solvent)
——
100 ppm
150 ppm
——
——
Phenacyl chloride
(a-Chloroacetophenone)
532-21-4
0.05 ppm
0.15 ppm
——
——
Phenol
108-95-2
5 ppm
10 ppm
——
X
Phenothiazine
92-84-2
5 mg/m3
10 mg/m3
——
X
p-Phenylene diamine
106-50-3
0.1 mg/m3
0.3 mg/m3
——
X
Phenyl ether (vapor)
101-84-8
1 ppm
3 ppm
——
——
Phenyl ether-diphenyl mixture (vapor)
——
1 ppm
3 ppm
——
——
Phenylethylene (Styrene)
100-42-5
50 ppm
100 ppm
——
——
Phenyl glycidyl ether (PGE)
122-60-1
1 ppm
3 ppm
——
——
Phenylhydrazine
100-63-0
5 ppm
10 ppm
——
X
Phenyl mercaptan
108-98-5
0.5 ppm
1.5 ppm
——
——
Phenylphosphine
638-21-1
——
——
0.05 ppm
——
Phorate
298-02-2
0.05 mg/m3
0.2 mg/m3
——
X
Phosdrin (Mevinphos)
7786-34-7
0.01 ppm
0.03 ppm
——
X
Phosgene (carbonyl chloride)
75-44-5
0.1 ppm
0.3 ppm
——
——
Phosphine
7803-51-2
0.3 ppm
1 ppm
——
——
Phosphoric acid
7664-38-2
1 mg/m3
3 mg/m3
——
——
Phosphorus (yellow)
7723-14-0
0.1 mg/m3
0.3 mg/m3
——
——
Phosphorous oxychloride
10025-87-3
0.1 ppm
0.3 ppm
——
——
Phosphorus pentachloride
10026-13-8
0.1 ppm
0.3 ppm
——
——
Phosphorus pentasulfide
1314-80-3
1 mg/m3
3 mg/m3
——
——
Phosphorus trichloride
12-2-19
0.2 ppm
0.5 ppm
——
——
Phthalic anhydride
85-44-9
1 ppm
3 ppm
——
——
m-Phthalodinitrile
626-17-5
5 mg/m3
10 mg/m3
——
——
Picloram
1918-02-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Picric acid (2, 4, 6-Trinitrophenol)
88-89-1
0.1 mg/m3
0.3 mg/m3
——
X
Pindone
(2-Pivalyl-1, 3-indandione,
Pival)
83-26-1
0.1 mg/m3
0.3 mg/m3
——
——
Piperazine dihydrochloride
142-64-3
5 mg/m3
10 mg/m3
——
——
Pival (Pindone)
83-26-1
0.1 mg/m3
0.3 mg/m3
——
——
Plaster of Paris
26499-65-0
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Platinum (as Pt)
7440-06-4
——
——
——
——
Metal
——
1 mg/m3
3 mg/m3
——
——
Soluble salts
——
0.002 mg/m3
0.006 mg/m3
——
——
Polychlorobiphenyls
(Chlorodiphenyls)
——
——
——
——
——
42% Chlorine (PCB)
53469-21-9
1 mg/m3
3 mg/m3
——
X
54% Chlorine (PCB)
11097-69-1
0.5 mg/m3
1.5 mg/m3
——
X
Portland cement
65997-15-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Potassium hydroxide
1310-58-3
——
——
2 mg/m3
——
Propane
74-98-6
1,000 ppm
1,250 ppm
——
——
Propargyl alcohol
107-19-7
1 ppm
3 ppm
——
X
beta-Propiolactone
57-57-8
——
——
——
——
Propionic acid
79-09-4
10 ppm
20 ppm
——
——
Propoxur (Baygon)
114-26-1
0.5 mg/m3
1.5 mg/m3
——
——
n-Propyl acetate
109-60-4
200 ppm
250 ppm
——
——
n-Propyl alcohol
71-23-8
200 ppm
250 ppm
——
X
n-Propyl nitrate
627-13-4
25 ppm
40 ppm
——
——
Propylene
——
Simple asphyxiant
——
——
——
Propylene dichloride
(1, 2-Dichloropropane)
78-87-5
75 ppm
110 ppm
——
——
Propylene glycol dinitrate
6423-43-4
0.05 ppm
0.15 ppm
——
X
Propylene glycol monomethyl ether
107-98-2
100 ppm
150 ppm
——
——
Propylene imine
75-55-8
2 ppm
4 ppm
——
X
Propylene oxide (1,2-Epoxypropane)
75-56-9
20 ppm
30 ppm
——
——
Propyne (Methyl acetylene)
74-99-7
1,000 ppm
1,250 ppm
——
——
Pyrethrum
8003-34-7
5 mg/m3
10 mg/m3
——
——
Pyridine
110-86-1
5 ppm
10 ppm
——
——
Pyrocatachol (Catechol)
120-80-9
5 ppm
10 ppm
——
X
Quinone (p-Benzoquinone)
106-51-4
0.1 ppm
0.3 ppm
——
——
RDX (Cyclonite)
——
1.5 mg/m3
3 mg/m3
——
X
Resorcinol
108-46-3
10 ppm
20 ppm
——
——
Rhodium (as Rh)
7440-16-6
——
——
——
——
Insoluble compounds,
metal fumes and dusts
——
0.1 mg/m3
0.3 mg/m3
——
——
Soluble compounds, salts
——
0.001 mg/m3
0.003 mg/m3
——
——
Ronnel
299-84-3
10 mg/m3
20 mg/m3
——
——
Rosin core solder, pyrolysis
products (as formaldehyde)
8050-09-7
0.1 mg/m3
0.3 mg/m3
——
——
Rotenone
83-79-4
5 mg/m3
10 mg/m3
——
——
Rouge
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Rubber solvent (naphtha)
8030-30-6
100 ppm
150 ppm
——
——
Selenium compounds (as Se)
7782-49-2
0.2 mg/m3
0.6 mg/m3
——
——
Selenium hexafluoride (as Se)
7783-79-1
0.05 ppm
0.15 ppm
——
——
Sesone (Crag herbicide)
136-78-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Sevin (Carbaryl)
63-25-2
5 mg/m3
10 mg/m3
——
——
Silane (see Silicon tetrahydride)
7803-62-5
5 ppm
10 ppm
——
——
Silica, amorphous, precipitated and gel
112926-00-8
6 mg/m3
12 mg/m3
——
——
Silica, amorphous, diatomaceous
earth, containing less than
1% crystalline silica
61790-53-2
——
——
——
——
Total particulate
——
6 mg/m3
12 mg/m3
——
——
Respirable fraction
——
3 mg/m3
6 mg/m3
——
——
Silica, crystalline cristobalite
——
——
——
——
——
Respirable fraction
Applies only where the exposure limit in chapter 296-840 WAC is not in effect.
14464-46-1
0.05 mg/m3
0.15 mg/m3
——
——
Silica, crystalline quartz
——
——
——
——
——
Respirable fraction
Applies only where the exposure limit in chapter 296-840 WAC is not in effect.
14808-60-7
0.1 mg/m3
0.3 mg/m3
——
——
Silica, crystalline tripoli (as quartz)
——
——
——
——
——
Respirable fraction
1317-95-9
0.1 mg/m3
0.3 mg/m3
——
——
Silica, crystalline tridymite
——
——
——
——
——
Respirable fraction
Applies only where the exposure limit in chapter 296-840 WAC is not in effect.
15468-32-3
0.05 mg/m3
0.15 mg/m3
——
——
Silica, fused
——
——
——
——
——
Respirable fraction
60676-86-0
0.1 mg/m3
0.3 mg/m3
——
——
Silicates (less than 1% crystalline silica )
——
——
——
——
——
Mica
——
——
——
——
——
Respirable fraction
12001-26-2
3 mg/m3
6 mg/m3
——
——
Soapstone
——
——
——
——
——
Total particulate
——
6 mg/m3
12 mg/m3
——
——
Respirable fraction
——
3 mg/m3
6 mg/m3
——
——
Talc (containing asbestos)
——
——
——
——
——
Talc (containing no asbestos)
——
——
——
——
——
Respirable fraction
14807-96-6
2 mg/m3
4 mg/m3
——
——
Tremolite
——
——
——
——
——
Silicon
7440-21-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Silicon carbide
409-21-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Silicon tetrahydride (Silane)
7803-62-5
5 ppm
10 ppm
——
——
Silver, metal dust and soluble
compounds (as Ag)
7440-22-4
0.01 mg/m3
0.03 mg/m3
——
——
Soapstone
——
——
——
——
——
Total particulate
——
6 mg/m3
12 mg/m3
——
——
Respirable fraction
——
3 mg/m3
6 mg/m3
——
——
Sodium azide (as HN3 or NaN3)
26628-22-8
——
——
0.1 ppm
X
Sodium bisulfite
7631-90-5
5 mg/m3
10 mg/m3
——
——
Sodium-2,
4-dichloro-phenoxyethyl
sulfate (Crag herbicide)
136-78-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Sodium fluoroacetate
62-74-8
0.05 mg/m3
0.15 mg/m3
——
X
Sodium hydroxide
1310-73-2
——
——
2 mg/m3
——
Sodium metabisulfite
7681-57-4
5 mg/m3
10 mg/m3
——
——
Starch
9005-25-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Stibine
7803-52-3
0.1 ppm
0.3 ppm
——
——
Stoddard solvent
8052-41-3
100 ppm
150 ppm
——
——
Strychnine
57-24-9
0.15 mg/m3
0.45 mg/m3
——
——
Styrene (Phenylethylene,
Vinyl benzene)
100-42-5
50 ppm
100 ppm
——
——
Subtilisins
9014-01-1
——
0.00006 mg/m3
——
——
 
 
 
(60 min.)
 
 
Sucrose
57-50-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Sulfotep (TEDP)
3689-24-5
0.2 mg/m3
0.6 mg/m3
——
X
Sulfur dioxide
7446-09-5
2 ppm
5 ppm
——
——
Sulfur hexafluoride
2551-62-4
1,000 ppm
1,250 ppm
——
——
Sulfuric acid
7664-93-9
1 mg/m3
3 mg/m3
——
——
Sulfur monochloride
10025-67-9
——
——
1 ppm
——
Sulfur pentafluoride
5714-22-1
——
——
0.01 ppm
——
Sulfur tetrafluoride
7783-60-0
——
——
0.1 ppm
——
Sulfuryl fluoride
2699-79-8
5 ppm
10 ppm
——
——
Sulprofos
35400-43-2
1 mg/m3
3 mg/m3
——
——
Systox (Demeton)
8065-48-3
0.01 ppm
0.03 ppm
——
X
2, 4, 5-T
93-76-5
10 mg/m3
20 mg/m3
——
——
Talc (containing asbestos)
——
——
——
——
——
Talc (containing no asbestos)
——
——
——
——
——
Respirable fraction
14807-96-6
2 mg/m3
4 mg/m3
——
——
Tantalum
——
——
——
——
——
Metal and oxide dusts
7440-25-7
5 mg/m3
10 mg/m3
——
——
TDI
(Toluene-2, 4-diisocyanate)
584-84-9
0.005 ppm
0.02 ppm
——
——
TEDP (Sulfotep)
3689-24-5
0.2 mg/m3
0.6 mg/m3
——
X
Tellurium and compounds (as Te)
13494-80-9
0.1 mg/m3
0.3 mg/m3
——
——
Tellurium hexafluoride (as Te)
7783-80-4
0.02 ppm
0.06 ppm
——
——
Temephos (Abate)
3383-96-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
TEPP
107-49-3
0.004 ppm
0.012 ppm
——
X
Terphenyls
26140-60-3
——
——
0.5 ppm
——
1, 1, 1, 2-Tetrachloro-2,
2-difluoroethane
76-11-0
500 ppm
625 ppm
——
——
1, 1, 2, 2-Tetrachloro-1,
2-difluoroethane
76-12-0
500 ppm
625 ppm
——
——
1, 1, 2, 2-Tetrachloroethane
79-34-5
1 ppm
3 ppm
——
X
Tetrachloroethylene
(Perchloroethylene)
127-18-4
25 ppm
38 ppm
——
——
Tetrachloromethane
(Carbon tetrachloride)
56-23-5
2 ppm
4 ppm
——
X
Tetrachloronaphthalene
1335-88-2
2 mg/m3
4 mg/m3
——
X
Tetraethyl lead (as Pb)
78-00-2
0.075 mg/m3
0.225 mg/m3
——
X
Tetrahydrofuran
109-99-9
200 ppm
250 ppm
——
——
Tetramethyl lead (as Pb)
75-74-1
0.075 mg/m3
0.225 mg/m3
——
X
Tetramethyl succinonitrile
3333-52-6
0.5 ppm
1.5 ppm
——
X
Tetranitromethane
509-14-8
1 ppm
3 ppm
——
——
Tetrasodium pyrophosphate
7722-88-5
5 mg/m3
10 mg/m3
——
——
Tetryl (2, 4, 6-trinitrophenyl-
methylnitramine)
479-45-8
1.5 mg/m3
3 mg/m3
——
X
Thallium (soluble compounds) (as Tl)
7440-28-0
0.1 mg/m3
0.3 mg/m3
——
X
4, 4-Thiobis
(6-tert-butyl-m-cresol)
96-69-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Thiodan (Endosulfan)
115-29-7
0.1 mg/m3
0.3 mg/m3
——
X
Thioglycolic acid
68-11-1
1 ppm
3 ppm
——-
X
Thionyl chloride
7719-09-7
——
——
1 ppm
——
Thiram
137-26-8
5 mg/m3
10 mg/m3
——
——
Tin (as Sn)
——
——
——
——
——
Inorganic compounds
7440-31-5
2 mg/m3
4 mg/m3
——
——
Tin (as Sn)
——
——
——
——
——
Organic compounds
7440-31-5
0.1 mg/m3
0.3 mg/m3
——
X
Tin oxide (as Sn)
21651-19-4
2 mg/m3
4 mg/m3
——
——
Titanium dioxide
13463-67-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
TNT (2, 4, 6-Trinitrotoluene)
118-96-7
0.5 mg/m3
1.5 mg/m3
——
X
Toluene
108-88-3
100 ppm
150 ppm
——
——
Toluene-2, 4-diisocyanate (TDI)
584-84-9
0.005 ppm
0.02 ppm
——-
——
m-Toluidine
108-44-1
2 ppm
4 ppm
——
X
o-Toluidine
95-53-4
2 ppm
4 ppm
——
X
p-Toluidine
106-49-0
2.0 ppm
4 ppm
——
X
Toxaphene (Chlorinated camphene)
8001-35-2
0.5 mg/m3
1 mg/m3
——
X
Tremolite
——
——
——
——
——
Tributyl phosphate
126-73-8
0.2 ppm
0.6 ppm
——
——
Trichloroacetic acid
76-03-9
1 ppm
3 ppm
——
——
1, 2, 4-Trichlorobenzene
120-82-1
——
——
5 ppm
——
1, 1, 1-Trichloroethane
(Methyl chloroform)
71-55-6
350 ppm
450 ppm
——
——
1, 1, 2-Trichloroethane
79-00-5
10 ppm
20 ppm
——
——
Trichloroethylene
79-01-6
50 ppm
200 ppm
——
——
Trichlorofluoromethane
(Fluorotrichloromethane)
75-69-4
——
——
1,000 ppm
——
Trichloromethane (Chloroform)
67-66-3
2 ppm
4 ppm
——
——
Trichloronaphthalene
1321-65-9
5 mg/m3
10 mg/m3
——
X
1, 2, 3-Trichloropropane
96-18-4
10 ppm
20 ppm
——
X
1, 1, 2-Trichloro-1, 2, 2-trifluoroethane
76-13-1
1,000 ppm
1,250 ppm
——
——
Tricyclohexyltin hydroxide (Cyhexatin)
13121-70-5
5 mg/m3
10 mg/m3
——
——
Triethylamine
121-44-8
10 ppm
15 ppm
——
——
Trifluorobromomethane
75-63-8
1,000 ppm
1,250 ppm
——
——
Trimellitic anhydride
552-30-7
0.005 ppm
0.015 ppm
——
——
Trimethylamine
75-50-3
10 ppm
15 ppm
——
——
Trimethyl benzene
25551-13-7
25 ppm
38 ppm
——
——
Trimethyl phosphite
121-45-9
2 ppm
4 ppm
——
——
2, 4, 6-Trinitrophenol (Picric acid)
88-89-1
0.1 mg/m3
0.3 mg/m3
——
X
2, 4, 6-Trinitrophenyl-methylnitramine
(Tetryl)
479-45-8
1.5 mg/m3
3 mg/m3
——
X
2, 4, 6-Trinitrotoluene (TNT)
118-96-7
0.5 mg/m3
1.5 mg/m3
——
X
Triorthocresyl phosphate
78-30-8
0.1 mg/m3
0.3 mg/m3
——
X
Triphenyl amine
603-34-9
5 mg/m3
10 mg/m3
——
——
Triphenyl phosphate
115-86-6
3 mg/m3
6 mg/m3
——
——
Tungsten (as W)
7440-33-7
——
——
——
——
Soluble compounds
——
1 mg/m3
3 mg/m3
——
——
Insoluble compounds
——
5 mg/m3
10 mg/m3
——
——
Turpentine
8006-64-2
100 ppm
150 ppm
——
——
Uranium (as U)
7440-61-1
——
——
——
——
Soluble compounds
——
0.05 mg/m3
0.15 mg/m3
——
——
Insoluble compounds
——
0.2 mg/m3
0.6 mg/m3
——
——
n-Valeraldehyde
110-62-3
50 ppm
75 ppm
——
——
Vanadium (as V2O5)
——
——
——
——
——
Respirable fraction
1314-62-1
0.05 mg/m3
0.15 mg/m3
——
——
Vegetable oil mist
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Vinyl acetate
108-05-1
10 ppm
20 ppm
——
——
Vinyl benzene (Styrene)
100-42-5
50 ppm
100 ppm
——
——
Vinyl bromide
593-60-2
5 ppm
10 ppm
——
——
Vinyl chloride (Chloroethylene)
75-01-4
1 ppm
5 ppm
——
——
Vinyl cyanide (Acrylonitrile)
107-13-1
2 ppm
10 ppm
——
——
Vinyl cyclohexene dioxide
106-87-6
10 ppm
20 ppm
——
X
Vinyl toluene
25013-15-4
50 ppm
75 ppm
——
——
Vinylidene chloride
(1, 1-Dichloroethylene)
75-35-4
1 ppm
3 ppm
——
——
VM & P Naphtha
8032-32-4
300 ppm
400 ppm
——
——
Warfarin
81-81-2
0.1 mg/m3
0.3 mg/m3
——
——
Welding fumes (total particulate)
——
5 mg/m3
10 mg/m3
——
——
Wood dust
——
——
——
——
——
Nonallergenic;
(All woods except
allergenics)
——
5 mg/m3
10 mg/m3
——
——
Allergenics (e.g. cedar,
mahogany and teak)
——
2.5 mg/m3
5 mg/m3
——
——
Xylenes (ortho, meta, and
para isomers)
(Dimethylbenzene)
1330-20-7
100 ppm
150 ppm
——
——
m-Xylene alpha, alpha-diamine
1477-55-0
——
——
0.1 mg/m3
X
Xylidine
(Dimethylaminobenzene)
1300-73-8
2 ppm
4 ppm
——
X
Yttrium
7440-65-5
1 mg/m3
3 mg/m3
——
——
Zinc chloride fume
7646-85-7
1 mg/m3
2 mg/m3
——
——
Zinc chromate (as CrO3)
Varies with compound
0.05 mg/m3
——
0.1 mg/m3
——
Zinc oxide
1314-13-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m
——
——
Zinc oxide fume
1314-13-2
5 mg/g3
10 mg/m3
——
——
Zinc stearate
557-05-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Zirconium compounds (as Zr)
7440-67-2
5 mg/m3
10 mg/m3
——
——
Reviser's note: The spelling error in the above section occurred in the copy filed by the agency and appears in the Register pursuant to the requirements of RCW 34.08.040.
Chapter  296-840  WAC
RESPIRABLE CRYSTALLINE SILICA
NEW SECTION
WAC 296-840-095 Definitions.
For the purposes of this chapter the following definitions apply:
Action level. A concentration of airborne respirable crystalline silica of 25 μg/m3, calculated as an 8-hour time-weighted average (TWA).
Competent person. An individual who is capable of identifying existing and foreseeable respirable crystalline silica hazards in the workplace and who has authorization to take prompt corrective measures to eliminate or minimize them. The competent person must have the knowledge and ability necessary to fulfill the responsibilities set forth in WAC 296-840-140.
Construction work. All or any part of excavation, construction, erection, alteration, repair, demolition, and dismantling, of buildings and other structures and all operations in connection therewith; the excavation, construction, alteration and repair of sewers, trenches, caissons, conduits, pipe lines, roads and all operations pertaining thereto; the moving of buildings and other structures, and to the construction, alteration, repair, or removal of wharfs, docks, bridges, culverts, trestles, piers, abutments or any other construction, alteration, repair or removal work related thereto.
Director. The director of the department of labor and industries or his/her authorized representative.
DOSH. The division of occupational safety and health, Washington state department of labor and industries.
Employee exposure. The exposure to airborne respirable crystalline silica that would occur if the employee were not using a respirator.
High-efficiency particulate air (HEPA) filter. A filter that is at least 99.97 percent efficient in removing mono-dispersed particles of 0.3 micrometers in diameter.
Objective data. Information, such as air monitoring data from industry-wide surveys or calculations based on the composition of a substance, demonstrating employee exposure to respirable crystalline silica associated with a particular product or material or a specific process, task, or activity. The data must reflect workplace conditions closely resembling or with a higher exposure potential than the processes, types of material, control methods, work practices, and environmental conditions in the employer's current operations.
Permissible exposure limit (PEL). A concentration of airborne respirable crystalline silica of 50 μg/m3, calculated as an 8-hour TWA and/or a 15-minute short-term exposure limit (STEL). Short-term exposure limits for respirable crystalline silica, as defined in this chapter, can be found in WAC 296-841-20025 and 296-307-62625.
Physician or other licensed health care professional (PLHCP). An individual whose legally permitted scope of practice (i.e., license, registration, or certification) allows him or her to independently provide or be delegated the responsibility to provide some or all of the particular health care services required by WAC 296-840-145.
Regulated area. An area, demarcated by the employer, where an employee's exposure to airborne concentrations of respirable crystalline silica exceeds, or can reasonably be expected to exceed, the PEL.
Respirable crystalline silica. Quartz, cristobalite, and/or tridymite contained in airborne particles that are determined to be respirable by a sampling device designed to meet the characteristics for respirable-particle-size-selective samplers specified in the International Organization for Standardization (ISO) 7708:1995: Air quality – Particle size fraction definitions for health-related sampling.
Specialist. An American Board Certified Specialist in Pulmonary Disease or an American Board Certified Specialist in Occupational Medicine.
NEW SECTION
WAC 296-840-100 Scope and application.
This chapter applies to all occupational exposures to respirable crystalline silica, except for the following:
(1) Where employee exposure results from the processing of sorptive clays.
(2) Where documented objective data demonstrates that employee exposures to respirable crystalline silica will remain below 25 micrograms per cubic meter of air (25 μg/m3) as an 8-hour TWA and the 15-minute STEL as defined in this chapter under any foreseeable conditions.
NEW SECTION
WAC 296-840-105 Exposure assessment.
This section applies to all occupational exposures except for tasks performed according to the requirements in WAC 296-840-110.
(1) Permissible exposure limit (PEL). You must ensure that no employee is exposed to an airborne concentration of respirable crystalline silica in excess of the 8-hour TWA PEL or the 15-minute STEL.
(2) Exposure assessment. You must assess the exposure of each employee who is or may reasonably be expected to be exposed to respirable crystalline silica at or above the action level or above the 15-minute STEL in accordance with either the performance option in (a) of this subsection or the scheduled monitoring option in (b) of this subsection.
(a) Performance option. You must assess the 8-hour TWA and the STEL for each employee on the basis of any combination of air monitoring data or objective data sufficient to accurately characterize employee exposures to respirable crystalline silica.
(b) Scheduled monitoring option:
(i) You must perform initial monitoring to assess the 8-hour TWA and the STEL for each employee on the basis of personal breathing zone air samples that reflect the exposures of employees on each shift, for each job classification, in each work area.
(ii) Where several employees perform the same tasks on the same shift and in the same work area, you may sample a representative fraction of these employees in order to meet this requirement.
(iii) In representative sampling, you must sample the employee(s) who are expected to have the highest exposure to respirable crystalline silica.
(iv) If initial monitoring indicates that employee exposures are below the action level and below the STEL, you may discontinue monitoring for those employees whose exposures are represented by such monitoring.
(v) Where the most recent exposure monitoring indicates that employee exposures are at or above the action level but at or below the PEL, you must repeat such monitoring within six months of the most recent monitoring.
(vi) Where the most recent exposure monitoring indicates that employee exposures are above the PEL, the employer shall repeat such monitoring within three months of the most recent monitoring.
(vii) Where the most recent (noninitial) exposure monitoring indicates that employee exposures are below the action level and the STEL, you must repeat such monitoring within six months of the most recent monitoring until two consecutive measurements, taken seven or more days apart, are below the action level and the STEL, at which time the employer may discontinue monitoring for those employees whose exposures are represented by such monitoring, except as otherwise provided in subsection (3) of this section.
(3) Reassessment of exposures. You must reassess exposures whenever a change in the production, process, control equipment, personnel, or work practices may reasonably be expected to result in new or additional exposures at or above the action level and/or the STEL, or when the employer has any reason to believe that new or additional exposures at or above the action level and/or the STEL have occurred.
(4) Methods of sample analysis. You must ensure that all samples taken to satisfy the monitoring requirements of subsection (2) of this section are evaluated by a laboratory that analyzes air samples for respirable crystalline silica in accordance with the procedures in WAC 296-840-165 Appendix AMethods of sample analysis of this chapter.
(5) Employee notification of assessment results.
(a) Individually notify each affected employee in writing of the results of that assessment or post the results in an appropriate location accessible to all affected employees in accordance with the following:
(i) Construction employers must notify affected employees within five working days after receiving any results of an exposure assessment in accordance with this rule.
(ii) All other employers must notify affected employees within fifteen working days after receiving any results of an exposure assessment in accordance with this rule.
(b) Whenever an exposure assessment indicates that employee exposure is above the PEL, you must describe in the written notification the corrective action being taken to reduce employee exposure to or below the PEL.
(6) Observation of monitoring.
(a) Where air monitoring is performed to comply with the requirements of this chapter, you must provide affected employees or their designated representatives an opportunity to observe any monitoring of employee exposure to respirable crystalline silica.
(b) When observation of monitoring requires entry into an area where the use of protective clothing or equipment is required for any workplace hazard, you must provide the observer with protective clothing and equipment at no cost and shall ensure that the observer uses such clothing and equipment.
NEW SECTION
WAC 296-840-110 Specified exposure control methods.
This section applies to construction work and other occupational exposures where the task performed is indistinguishable from a construction task listed in Table 1 of this section and the task will not be performed regularly in the same environment and conditions.
(1) For each employee engaged in a task identified in Table 1 of this section, you must fully and properly implement the engineering controls, work practices, and respiratory protection specified for the task in Table 1 of this section, unless you assess and limit the exposure of the employee to respirable crystalline silica in accordance with WAC 296-840-105.
(2) When implementing the control measures specified in Table 1 of this section, you must:
(a) For tasks performed indoors or in enclosed areas, provide a means of exhaust as needed to minimize the accumulation of visible airborne dust;
(b) For tasks performed using wet methods, apply water at flow rates sufficient to minimize release of visible dust;
(c) For measures implemented that include an enclosed cab or booth, ensure that the enclosed cab or booth:
(i) Is maintained as free as practicable from settled dust;
(ii) Has door seals and closing mechanisms that work properly;
(iii) Has gaskets and seals that are in good condition and working properly;
(iv) Is under positive pressure maintained through continuous delivery of fresh air;
(v) Has intake air that is filtered through a filter that is ninety-five percent efficient in the 0.3-10.0 μm range (e.g., MERV-16 or better); and
(vi) Has heating and cooling capabiliites.
(3) Where an employee performs more than one task in Table 1 of this section during the course of a shift, and the total duration of all tasks combined is more than four hours, the required respiratory protection for each task is the respiratory protection specified for more than four hours per shift. If the total duration of all tasks in Table 1 of this section combined is less than four hours, the required respiratory protection for each task is the respiratory protection specified for less than four hours per shift.
Table 1
Specified Exposure Control Methods When Working With Materials Containing Crystalline Silica
Equipment/ Task
Engineering and Work Practice Control Methods
Required Respiratory Protection and Minimum Assigned Protection Factor (APF)
≤ 4 hours/shift
> 4 hours/shift
(i) Stationary masonry saws
Use saw equipped with integrated water delivery system that continuously feeds water to the blade.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
(ii) Hand-held power saws (any blade diameter)
Use saw equipped with integrated water delivery system that continuously feeds water to the blade.
 
 
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
- When used outdoors.
- When used indoors or in an enclosed area.
None
APF 10
APF 10
APF 10
(iii) Hand-held power saws for cutting fiber-cement board (with blade diameter of 8 inches or less)
For tasks performed outdoors only:
 
 
Use saw equipped with commercially available dust collection system.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
Dust collector must provide the air flow recommended by the tool manufacturer, or greater, and have a filter with 99% or greater efficiency.
 
 
(iv) Walk-behind saws
Use saw equipped with integrated water delivery system that continuously feeds water to the blade.
 
 
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
- When used outdoors.
- When used indoors or in an enclosed area.
None
APF 10
None
APF 10
(v) Drivable saws
For tasks performed outdoors only:
 
 
 
Use saw equipped with integrated water delivery system that continuously feeds water to the blade.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
(vi) Rig-mounted core saws or drills
Use tool equipped with integrated water delivery system that supplies water to cutting surface.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
(vii) Hand-held and stand-mounted drills (including impact and rotary hammer drills)
Use drill equipped with commercially available shroud or cowling with dust collection system.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
Dust collector must provide the air flow recommended by the tool manufacturer, or greater, and have a filter with 99% or greater efficiency and a filter-cleaning mechanism.
 
 
 
Use a HEPA-filtered vacuum when cleaning holes.
 
 
(viii) Dowel drilling rigs for concrete
For tasks performed outdoors only:
 
 
 
Use shroud around drill bit with a dust collection system. Dust collector must have a filter with 99% or greater efficiency and a filter-cleaning mechanism.
APF 10
APF 10
 
Use a HEPA-filtered vacuum when cleaning holes.
 
 
(ix) Vehicle-mounted drilling rigs for rock and concrete
Use dust collection system with close capture hood or shroud around drill bit with a low-flow water spray or wet the dust at the discharge point from the dust collector.
None
None
 
OR
 
 
 
Operate from within an enclosed cab and use water for dust suppression on drill bit.
None
None
(x) Jackhammers and hand-held powered chipping tools
Use tool with water delivery system that supplies a continuous stream or spray of water at the point of impact.
 
 
 
- When used outdoors.
- When used indoors or in an enclosed area.
None
APF 10
None
APF 10
 
OR
 
 
 
Use tool equipped with commercially available shroud and dust collection system.
 
 
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
Dust collector must provide the air flow recommended by the tool manufacturer, or greater, and have a filter with 99% or greater efficiency and a filter-cleaning mechanism.
None
APF 10
 
- When used outdoors.
- When used indoors or in an enclosed area.
APF 10
APF 10
(xi) Hand-held grinders for mortar removal (i.e., tuckpointing)
Use grinder equipped with commercially available shroud and dust collection system.
APF 10
APF 25
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
Dust collector must provide 25 cubic feet per minute (cfm) or greater of airflow per inch of wheel diameter and have a filter with 99% or greater efficiency and cyclonic preseparator or filter-cleaning mechanism.
 
 
(xii) Hand-held grinders for uses other than mortar removal
For tasks performed outdoors only:
 
 
Use grinder equipped with integrated water delivery system that continuously feeds water to the grinding surface.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
OR
 
 
 
Use grinder equipped with commercially available shroud and dust collection system.
 
 
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
Dust collector must provide 25 cubic feet per minute (cfm) or greater of airflow per inch of wheel diameter and have a filter with 99% or greater efficiency and a cyclonic preseparator or filter-cleaning mechanism.
None
None
None
APF 10
 
- When used outdoors.
- When used indoors or in an enclosed area.
 
 
(xiii) Walk-behind milling machines and floor grinders
Use machine equipped with integrated water delivery system that continuously feeds water to the cutting surface.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
OR
 
 
 
Use machine equipped with dust collection system recommended by the manufacturer.
None
None
 
Operate and maintain tool in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
Dust collector must provide the air flow recommended by the manufacturer, or greater, and have a filter with 99% or greater efficiency and a filter-cleaning mechanism.
 
 
 
When used indoors or in an enclosed area, use a HEPA-filtered vacuum to remove loose dust in between passes.
 
 
(xiv) Small drivable milling machines (less than half-lane)
Use machine equipped with supplemental water sprays designed to suppress dust. Water must be combined with a surfactant.
None
None
 
Operate and maintain machine to minimize dust emissions.
 
 
(xv) Large drivable milling machines (half-lane and larger)
For cuts of any depth on asphalt only:
None
None
Use machine equipped with exhaust ventilation on drum enclosure and supplemental water sprays designed to suppress dust.
 
 
 
Operate and maintain machine to minimize dust emissions.
 
 
 
For cuts of four inches in depth or less on any substrate:
None
None
 
Use machine equipped with exhaust ventilation on drum enclosure and supplemental water sprays designed to suppress dust.
 
 
 
Operate and maintain machine to minimize dust emissions.
 
 
 
OR
 
 
 
Use a machine equipped with supplemental water spray designed to suppress dust. Water must be combined with a surfactant.
 
 
 
Operate and maintain machine to minimize dust emissions.
 
 
(xvi) Crushing machines
Use equipment designed to deliver water spray or mist for dust suppression at crusher and other points where dust is generated (e.g., hoppers, conveyers, sieves/sizing or vibrating components, and discharge points).
None
None
 
Operate and maintain machine in accordance with manufacturer's instructions to minimize dust emissions.
 
 
 
Use a ventilated booth that provides fresh, climate-controlled air to the operator, or a remote control station.
 
 
(xvii) Heavy equipment and utility vehicles used to abrade or fracture silica-containing materials (e.g., hoe-ramming, rock ripping) or used during demolition activities involving silica-containing materials
Operate equipment from within an enclosed cab.
None
None
When employees outside of the cab are engaged in the task, apply water and/or dust suppressants as necessary to minimize dust emissions.
None
None
(xviii) Heavy equipment and utility vehicles for tasks such as grading and excavating but not including: Demolishing, abrading or fracturing silica-containing materials
Apply water and/or dust suppressants as necessary to minimize dust emissions.
None
None
OR
 
 
When the equipment operator is the only employee engaged in the task, operate equipment from within an enclosed cab.
None
None
Reviser's note: The spelling error in the above section occurred in the copy filed by the agency and appears in the Register pursuant to the requirements of RCW 34.08.040.
NEW SECTION
WAC 296-840-115 Regulated areas.
This section does not apply to occupational respirable crystalline silica exposures in construction work.
(1) Establishment. You must establish a regulated area wherever an employee's exposure to airborne concentrations of respirable crystalline silica is, or can reasonably be expected to be, in excess of the PEL.
(2) Demarcation. You must demarcate the regulated areas from the rest of the workplace in a manner that minimizes the number of employees exposed to respirable crystalline silica within the regulated area.
(3) You must post signs at all entrances to regulated areas that bear the legend specified in WAC 296-840-150(2).
(4) Access. You must limit access to regulated areas to:
(a) Persons authorized by the employer and required by work duties to be present in the regulated area;
(b) Any person entering such an area as a designated representative of employees for the purpose of exercising the right to observe monitoring procedures under WAC 296-840-105; and
(c) Any person authorized by the department or regulations issued under it to be in a regulated area.
(5) Provision of respirators. You must provide each employee and the employee's designated representative entering a regulated area with an appropriate respirator in accordance with WAC 296-840-125 and must require each employee and the employee's designated representative to use the respirator while in a regulated area.
NEW SECTION
WAC 296-840-120 Methods of compliance.
This section does not apply to tasks listed and performed in accordance with Table 1 of WAC 296-840-110 Specified exposure control methods.
(1) Engineering and work practice controls. You must use engineering and work practice controls to reduce and maintain employee exposure to respirable crystalline silica to or below the PEL, unless the employer can demonstrate that such controls are not feasible. Wherever such feasible engineering and work practice controls are not sufficient to reduce employee exposure to or below the PEL, you must nonetheless use them to reduce employee exposure to the lowest feasible level and must supplement them with the use of respiratory protection that complies with the requirements of WAC 296-840-125.
(2) Abrasive blasting. In addition to the requirements of this section, you must comply with chapter 296-818 WAC, safety standards for abrasive blasting and other applicable DOSH standards where abrasive blasting is conducted using crystalline silica containing blasting agents, or where abrasive blasting is conducted on substrates that contain crystalline silica.
NEW SECTION
WAC 296-840-125 Respiratory protection.
(1) Where respiratory protection is required by this section, you must provide each employee an appropriate respirator that complies with the requirements of this section and chapter 296-842 WAC, Respirators.
(2) Respiratory protection is required:
(a) Where exposures exceed the PEL during periods necessary to install or implement feasible engineering and work practice controls;
(b) Where exposures exceed the PEL during tasks, such as certain maintenance and repair tasks, for which engineering and work practice controls are not feasible;
(c) During tasks for which an employer has implemented all feasible engineering and work practice controls and such controls are not sufficient to reduce exposures to or below the PEL;
(d) During periods when an employee or employees are in a regulated area; and
(e) Where specified for tasks performed according to the requirements in Table 1 of WAC 296-840-110 Specified exposure control methods.
NEW SECTION
WAC 296-840-130 Respiratory protection program.
(1) Where respirator use is required by this chapter, you must institute a respiratory protection program in accordance with chapter 296-842 WAC, Respirators.
(2) Specified exposure control methods. For tasks listed in Table 1 of WAC 296-840-110, if you fully and properly implement the engineering controls, work practices, and respiratory protection described in Table 1 of WAC 296-840-110, you will be considered to be in compliance with WAC 296-840-125(1) and the requirements for selection of respirators in chapter 296-842 WAC with regard to exposure to respirable crystalline silica.
NEW SECTION
WAC 296-840-135 Housekeeping.
(1) You must not allow dry sweeping or dry brushing where such activity could contribute to employee exposure to respirable crystalline silica unless wet sweeping, HEPA-filtered vacuuming or other methods that minimize the likelihood of exposure are not feasible.
(2) You must not allow compressed air to be used to clean clothing or surfaces where such activity could contribute to employee exposure to respirable crystalline silica unless:
(a) The compressed air is used in conjunction with a ventilation system that effectively captures the dust cloud created by the compressed air; or
(b) No alternative method is feasible.
NEW SECTION
WAC 296-840-140 Written exposure control plan.
(1) You must establish and implement a written exposure control plan that contains at least the following elements:
(a) A description of the tasks in the workplace that involve exposure to respirable crystalline silica;
(b) A description of the engineering controls, work practices, and respiratory protection used to limit employee exposure to respirable crystalline silica for each task; and
(c) A description of the housekeeping measures used to limit employee exposure to respirable crystalline silica.
(2) You must review and evaluate the effectiveness of the written exposure control plan at least annually and update it as necessary.
(3) You must make the written exposure control plan readily available for examination and copying, upon request, to each employee covered by this chapter, their designated representatives, and the director.
(4) In addition to the above written exposure control plan requirements, you must include the following elements for construction work:
(a) A description of the procedures used to restrict access to work areas, when necessary, to minimize the number of employees exposed to respirable crystalline silica and their level of exposure, including exposures generated by other employers or sole proprietors.
(b) A competent person to make frequent and regular inspections of job sites, materials, and equipment to implement the written exposure control plan.
NEW SECTION
WAC 296-840-145 Medical surveillance.
(1) Medical surveillance must be made available at no cost to the employee and at a reasonable time and place for any employee:
(a) Doing construction tasks and required to use a respirator for thirty or more days per year.
(b) Doing work other than construction tasks and will be occupationally exposed to respirable crystalline silica at or above the action level and/or the STEL for thirty or more days per year.
(2) You must ensure that all medical examinations and procedures required by this chapter are performed by a PLHCP as defined in WAC 296-840-095.
(3) Initial examination. You must make available an initial (baseline) medical examination within thirty days after initial assignment, unless the employee has received a medical examination that meets the requirements of this chapter within the last three years. The examination must consist of:
(a) A medical and work history, with emphasis on: Past, present, and anticipated exposure to respirable crystalline silica, dust, and other agents affecting the respiratory system; any history of respiratory system dysfunction, including signs and symptoms of respiratory disease (e.g., shortness of breath, cough, wheezing); smoking status and history; and history of tuberculosis. The history of tuberculosis should include completion of the Washington state department of labor and industries form F252-113-000, Adult Tuberculosis Screening Tool for Workers Exposed to Respirable Crystalline Silica, located in Appendix C;
(b) A physical examination with special emphasis on the respiratory system;
(c) A chest X-ray (a single posteroanterior radiographic projection or radiograph of the chest at full inspiration recorded on either film (no less than 14 x 17 inches and no more than 16 x 17 inches) or digital radiography systems), interpreted and classified according to the International Labour Office (ILO) International Classification of Radiographs of Pneumoconioses by a NIOSH-certified B Reader;
(d) A pulmonary function test to include forced vital capacity (FVC) and forced expiratory volume in one second (FEV1) and FEV1/FVC ratio, administered by a spirometry technician with a current certificate from a NIOSH-approved spirometry course;
(e) Testing for latent tuberculosis infection; and
(f) Any other test deemed appropriate by the PLHCP.
(4) Periodic examinations. You must make available medical examinations that include the procedures described in this section at least every three years or more frequently if recommended by the PLHCP.
(5) Information provided to the PLHCP. You must ensure that the examining PLHCP has a copy of this standard, and must provide the PLHCP with the following information:
(a) A description of the employee's former, current, and anticipated duties as they relate to the employee's occupational exposure to respirable crystalline silica;
(b) The employee's former, current, and anticipated levels of occupational exposure to respirable crystalline silica;
(c) A description of any personal protective equipment used or to be used by the employee, including when and for how long the employee has used or will use that equipment; and
(d) Information from records of employment-related medical examinations previously provided to the employee and currently within the control of the employer.
(6) PLHCP's written medical report for the employee. You must ensure that the PLHCP explains to the employee the results of the medical examination and provides each employee with a written medical report within thirty days of each medical examination performed. The written report must contain:
(a) A statement indicating the results of the medical examination, including any medical condition(s) that would place the employee at increased risk of material impairment to health from exposure to respirable crystalline silica and any medical conditions that require further evaluation or treatment;
(b) Any recommended limitations on the employee's use of respirators;
(c) Any recommended limitations on the employee's exposure to respirable crystalline silica; and
(d) A statement that the employee should be examined by a specialist under subsection (9)(a) of this section if the chest X-ray provided in accordance with this chapter is classified as 1/0 or higher by the B Reader, or if referral to a specialist is otherwise deemed appropriate by the PLHCP.
(7) PLHCP's written medical opinion for employers. You must obtain a written medical opinion from the PLHCP within thirty days of the medical examination. The written opinion must contain only the following:
(a) The date of the examination;
(b) A statement that the examination has met the requirements of this section;
(c) Any recommended limitations on the employee's use of respirators; and
(d) If the employee provides written authorization, the written opinion shall also contain either or both of the following:
(i) Any recommended limitations on the employee's exposure to respirable crystalline silica;
(ii) A statement that the employee should be examined by a specialist under subsection (9)(a) of this section if the chest X-ray provided in accordance with this chapter is classified as 1/0 or higher by the B Reader, or if referral to a specialist is otherwise deemed appropriate by the PLHCP.
(8) You must ensure that each employee receives a copy of the written medical opinion described in subsection (7) of this section within thirty days of each medical examination performed.
(9) Additional examinations.
(a) If the PLHCP's written medical opinion indicates that an employee should be examined by a specialist, you must make available a medical examination by a specialist within thirty days after receiving the PLHCP's written opinion. You must ensure that:
(i) The examining specialist is provided with all of the information that the employer is obligated to provide to the PLHCP in accordance with subsection (5) of this section.
(ii) The specialist explains to the employee the results of the medical examination and provides each employee with a written medical report within thirty days of the examination. The written report shall meet the requirements of subsection (6)(a), (b), and (c) of this section.
(b) You must obtain a written opinion from the specialist within thirty days of the medical examination. The written opinion shall meet the requirements of subsection (7), except (b) and (d)(ii) of this section.
NEW SECTION
WAC 296-840-150 Communication of respirable crystalline silica hazards to employees.
(1) Regarding hazard communication you must:
(a) Include respirable crystalline silica in the program established to comply with chapter 296-901 WAC, Globally harmonized system for hazard communication.
(b) Ensure that each employee has access to labels on containers of crystalline silica and safety data sheets, and is trained in accordance with WAC 296-901-14016 and subsection (3) of this section. The employer shall ensure that at least the following hazards are addressed: Cancer, lung effects, immune system effects, and kidney effects.
(2) Signs. Where a regulated area is established you must post signs at all entrances to the regulated areas that bear the following legend:
DANGER
RESPIRABLE CRYSTALLINE SILICA
MAY CAUSE CANCER
CAUSES DAMAGE TO LUNGS
WEAR RESPIRATORY PROTECTION IN THIS AREA
AUTHORIZED PERSONNEL ONLY
(3) Regarding employee information and training, you must ensure that each employee covered by this chapter can demonstrate knowledge and understanding of at least the following:
(a) The health hazards associated with exposure to respirable crystalline silica;
(b) Specific tasks in the workplace that could result in exposure to respirable crystalline silica;
(c) Specific measures you have implemented to protect employees from exposure to respirable crystalline silica, including engineering controls, work practices, and respirators to be used;
(d) The contents of this chapter;
(e) The purpose and a description of the medical surveillance program required by WAC 296-840-145, and notice that the medical surveillance program under this chapter is not intended to reduce a worker's legal rights under Title 51 RCW;
(f) The identity of the competent person designated by the employer in accordance with WAC 296-840-140 (4)(b).
(4) You must make a copy of this chapter readily available without cost to each employee covered by this chapter.
NEW SECTION
WAC 296-840-155 Recordkeeping.
(1) Air monitoring data.
(a) You must make and maintain an accurate record of all exposure measurements taken to assess employee exposure to respirable crystalline silica, as prescribed in WAC 296-840-105(2). This record must include at least the following information:
(i) The date of measurement for each sample taken;
(ii) The task monitored;
(iii) Sampling and analytical methods used;
(iv) Number, duration, and results of samples taken;
(v) Identity of the laboratory that performed the analysis;
(vi) Type of personal protective equipment, such as respirators, worn by the employees monitored; and
(vii) Name, Social Security number, and job classification of all employees represented by the monitoring, indicating which employees were actually monitored.
(b) You must ensure that exposure records are maintained and made available in accordance with chapter 296-802 WAC, Employee medical and exposure records.
(2) Objective data.
(a) You must make and maintain an accurate record of all objective data relied upon to comply with the requirements of this chapter. This record must include at least the following information:
(i) The crystalline silica-containing material in question;
(ii) The source of the objective data;
(iii) The testing protocol and results of testing;
(iv) A description of the process, task, or activity on which the objective data were based; and
(v) Other data relevant to the process, task, activity, material, or exposures on which the objective data were based.
(b) You must ensure that objective data are maintained and made available in accordance with chapter 296-802 WAC, Employee medical and exposure records.
(3) Medical surveillance.
(a) You must make and maintain an accurate record for each employee covered by medical surveillance under WAC 296-840-145. The record must include the following information about the employee:
(i) Name and Social Security number;
(ii) A copy of the PLHCPs' and specialists' written medical opinions; and
(iii) A copy of the information provided to the PLHCPs and specialists.
(b) You must ensure that medical records are maintained and made available in accordance with chapter 296-802 WAC, Employee medical and exposure records.
NEW SECTION
WAC 296-840-160 Effective dates.
This chapter becomes effective on February 26, 2018. Employers must comply with obligations of this chapter in accordance with the following:
(1) For occupational exposures to respirable crystalline silica in construction work, employers must comply with all obligations of this chapter by October 1, 2018. This includes the sample analysis requirement.
(2) For all occupational exposures to respirable crystalline silica other than construction work, employers must comply with this chapter by July 1, 2019, except as follows:
(a) Where employee exposure to respirable crystalline silica is above the PEL for thirty or more days per year medical surveillance requirements in WAC 296-840-145 must be complied with by October 1, 2018.
(b) Where employee exposure to respirable crystalline silica is at or above the action level or the STEL for thirty or more days per year medical surveillance requirements in WAC 296-840-145 must be complied with by June 23, 2020.
(c) For hydraulic fracturing operations in the oil and gas industry, obligations for engineering controls under WAC 296-840-120(1) begin July 1, 2022.
NEW SECTION
WAC 296-840-165 Appendix AMethods of sample analysis.
This appendix specifies the procedures for analyzing air samples for respirable crystalline silica, as well as the quality control procedures that employers must ensure that laboratories use when performing an analysis required under WAC 296-840-105(4). Employers must ensure that such a laboratory:
(1) Evaluates all samples using the procedures specified in one of the following analytical methods: OSHA ID-142; NMAM 7500; NMAM 7602; NMAM 7603; MSHA P-2; or MSHA P-7;
(2) Is accredited to ANS/ISO/IEC Standard 17025:2005 with respect to crystalline silica analyses by a body that is compliant with ISO/IEC Standard 17011:2004 for implementation of quality assessment programs;
(3) Uses the most current National Institute of Standards and Technology (NIST) or NIST traceable standards for instrument calibration or instrument calibration verification;
(4) Implements an internal quality control (QC) program that evaluates analytical uncertainty and provides employers with estimates of sampling and analytical error;
(5) Characterizes the sample material by identifying polymorphs of respirable crystalline silica present, identifies the presence of any interfering compounds that might affect the analysis, and makes any corrections necessary in order to obtain accurate sample analysis; and
(6) Analyzes quantitatively for crystalline silica only after confirming that the sample matrix is free of uncorrectable analytical interferences, corrects for analytical interferences, and uses a method that meets the following performance specifications:
(a) Each day that samples are analyzed, performs instrument calibration checks with standards that bracket the sample concentrations;
(b) Uses five or more calibration standard levels to prepare calibration curves and ensures that standards are distributed through the calibration range in a manner that accurately reflects the underlying calibration curve; and
(c) Optimizes methods and instruments to obtain a quantitative limit of detection that represents a value no higher than 25 percent of the PEL based on sample air volume.
AMENDATORY SECTION (Amending WSR 17-18-075, filed 9/5/17, effective 10/6/17)
WAC 296-841-20025 Permissible exposure limits (PELs).
IMPORTANT:
The following information applies to Table 3, Permissible Exposure Limits (PELs) for Airborne Contaminants.
(1) Ppm refers to parts of vapor or gas per million parts of air by volume, at 25 degrees C and 760 mm Hg pressure.
(2) Mg/m3 refers to milligrams of an airborne contaminant per cubic meter of air.
(3) F/cc refers to fibers per cubic centimeter of air.
(4) For a metal that is measured as the metal itself, only the CAS number for the metal is given. The CAS numbers for individual compounds of the metal are not provided. For more information about CAS registry numbers see the web site: http://www.cas.org.
(5) Short-term exposure limits (STEL) pertain to fifteen-minute exposure periods, unless another time period is noted in Table 3.
(6) An "X" in the "skin" column indicates the contaminant can be absorbed through the skin, either by airborne or direct contact.
(a) Personal protective equipment (PPE) to prevent skin contact may be needed to minimize the risk for adverse health effects when employees are exposed to these chemicals.
(b) Requirements for the use of gloves, coveralls, goggles, and other personal protective equipment can be found in WAC 296-800-160, Personal protective equipment (PPE).
(7) Nuisance dusts (also known as inert dusts) are included in the Table 3 listing, particulates not otherwise regulated (PNOR).
The PNOR listing in Table 3 also applies to other particulate airborne contaminants for which a specific PEL is NOT listed unless the airborne contaminant is found to require a lower limit.
(8) The respirable fraction of a particulate airborne contaminant is measured by sampling with a size-selector having the following characteristics:
Mean aerodynamic
diameter in micrometers
Percent passing the selector
1
97
2
91
3
74
4
50
5
30
6
17
7
9
8
5
10
1
Table 3 "Permissible Exposure Limits (PELs) for Airborne Contaminants"
Airborne contaminant
CAS
TWA8
STEL
Ceiling
Skin
Abate (Temephos)
3383-96-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Acetaldehyde
75-07-0
100 ppm
150 ppm
——
——
Acetic acid
64-19-7
10 ppm
20 ppm
——
——
Acetic anhydride
108-24-7
——
——
5 ppm
——
Actinolite (asbestiform) (as asbestos)
(see WAC 296-62-077 and
chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Acetone
67-64-1
750 ppm
1,000 ppm
——
——
Acetonitrile
75-05-8
40 ppm
60 ppm
——
——
2-Acetylaminofluorene
(see WAC 296-62-073)
53-96-3
——
——
——
——
Acetylene
74-86-2
Simple asphyxiant
——
——
——
Acetylene dichloride
(1,2-Dichloroethylene)
540-59-0
200 ppm
250 ppm
——
——
Acetylene tetrabromide
79-27-6
1 ppm
3 ppm
——
——
Acetylsalicylic acid
(Aspirin)
50-78-2
5 mg/m3
10 mg/m3
——
——
Acrolein
107-02-8
0.1 ppm
0.3 ppm
——
——
Acrylamide
79-06-1
0.03 mg/m3
0.09 mg/m3
——
X
Acrylic acid
79-10-7
10 ppm
20 ppm
——
X
Acrylonitrile (Vinyl cyanide)
(see WAC 296-62-07336)
107-13-1
2 ppm
10 ppm
——
——
Aldrin
309-00-2
0.25 mg/m3
0.75 mg/m3
——
X
Allyl alcohol
107-18-6
2 ppm
4 ppm
——
X
Allyl chloride
107-05-1
1 ppm
2 ppm
——
——
Allyl glycidyl ether (AGE)
106-92-3
5 ppm
10 ppm
——
——
Allyl propyl disulfide
2179-59-1
2 ppm
3 ppm
——
——
alpha-Alumina
(Aluminum oxide)
1344-28-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Aluminum (as Al)
7429-90-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Pyro powders
——
5 mg/m3
10 mg/m3
——
——
Welding fumes
——
5 mg/m3
10 mg/m3
——
——
Soluble salts
——
2 mg/m3
4 mg/m3
——
——
Alkyls (NOC)
——
2 mg/m3
4 mg/m3
——
——
Aluminum oxide (Alundum,
Corundum)
7429-90-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
4-Aminodiphenyl
(see WAC 296-62-073)
92-67-1
——
——
——
——
2-Aminoethanol
(Ethanolamine)
141-43-5
3 ppm
6 ppm
——
——
2-Aminopyridine
504-29-0
0.5 ppm
1.5 ppm
——
——
Amitrole
61-82-5
0.2 mg/m3
0.6 mg/m3
——
——
Ammonia
7664-41-7
25 ppm
35 ppm
——
——
Ammonium chloride, fume
12125-02-9
10 mg/m3
20 mg/m3
——
——
Ammonium sulfamate (Ammate)
7773-06-0
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5.0 mg/m3
10 mg/m3
——
——
Amosite (as asbestos)
(see WAC 296-62-077 ((and))
and chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
n-Amyl acetate
628-63-7
100 ppm
150 ppm
——
——
sec-Amyl acetate
626-38-0
125 ppm
156 ppm
——
——
Aniline and homologues
62-53-3
2 ppm
4 ppm
——
X
Anisidine (o, p-isomers)
29191-52-4
0.1 ppm
0.3 ppm
——
X
Anthophyllite (asbestiform) (as
asbestos)
(see WAC 296-62-077 and
chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Antimony and compounds (as Sb)
7440-36-0
0.5 mg/m3
1.5 mg/m3
——
——
ANTU
(alpha Naphthyl thiourea)
86-88-4
0.3 mg/m3
0.9 mg/m3
——
——
Argon
7440-37-1
Simple asphyxiant
——
——
——
Arsenic,
organic compounds (as As)
7440-38-2
0.2 mg/m3
0.6 mg/m3
——
——
Arsenic, inorganic
compounds (as As) (when
use is covered by chapter
296-848 WAC)
7440-38-2
0.01 mg/m3
——
——
——
Arsenic, inorganic
compounds (as As)
(when use is not
covered by chapter
296-848 WAC)
7440-38-2
0.2 mg/m3
0.6 mg/m3
——
——
Arsine
7784-42-1
0.05 ppm
0.15 ppm
——
——
Asbestos
(see WAC 296-62-077
and chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Asphalt (Petroleum fumes)
8052-42-4
5 mg/m3
10 mg/m3
——
——
Atrazine
1912-24-9
5 mg/m3
10 mg/m3
——
——
Azinphos methyl (Guthion)
86-50-0
0.2 mg/m3
0.6 mg/m3
——
X
Azodrin (Monocrotophos)
6923-22-4
0.25 mg/m3
0.75 mg/m3
——
——
Barium, soluble
compounds (as Ba)
7440-39-3
0.5 mg/m3
1.5 mg/m3
——
——
Barium sulfate
7727-43-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Baygon (Propoxur)
114-26-1
0.5 mg/m3
1.5 mg/m3
——
——
Benomyl
17804-35-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Benzene
(see chapter 296-849 WAC)
71-43-2
1 ppm
5 ppm
——
——
Benzidine
(see WAC 296-62-073)
92-87-5
——
——
——
——
p-Benzoquinone
(Quinone)
106-51-4
0.1 ppm
0.3 ppm
——
——
Benzo(a) pyrene
(Coal tar pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
——
——
Benzoyl peroxide
94-36-0
5 mg/m3
10 mg/m3
——
——
Benzyl chloride
100-44-7
1ppm
3 ppm
——
——
Beryllium and beryllium
compounds (as Be)
7440-41-7
((0.002)) 0.0002 mg/m3
((0.005)) 0.002 mg/m3
(30 min.)
0.025 mg/m3
——
(See WAC 296-62-085)
 
 
 
 
 
Biphenyl (Diphenyl)
92-52-4
0.2 ppm
0.6 ppm
——
——
Bismuth telluride, undoped
1304-82-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Bismuth telluride, Se-doped
——
5 mg/m3
10 mg/m3
——
——
Borates, tetra, sodium salts
——
——
——
——
——
Anhydrous
1330-43-4
1 mg/m3
3 mg/m3
——
——
Decahydrate
1303-96-4
5 mg/m3
10 mg/m3
——
——
Pentahydrate
12179-04-3
1 mg/m3
3 mg/m3
——
——
Boron oxide
1303-86-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Boron tribromide
10294-33-4
——
——
1 ppm
——
Boron trifluoride
6737-07-2
——
——
1 ppm
——
Bromacil
314-40-9
1 ppm
3 ppm
——
——
Bromine
7726-95-6
0.1 ppm
0.3 ppm
——
——
Bromine pentafluoride
7789-30-2
0.1 ppm
0.3 ppm
——
——
Bromochloromethane
(((Chlorobromomthane)))
(Chlorobromomethane)
 
74-97-5
200 ppm
250 ppm
——
——
Bromoform
15-25-2
0.5 ppm
1.5 ppm
——
X
Butadiene
(1,3-butadiene)
(see WAC 296-62-07460)
106-99-0
1 ppm
5 ppm
——
——
Butane
106-97-8
800 ppm
1,000 ppm
——
——
Butanethiol
(Butyl mercaptan)
109-79-5
0.5 ppm
1.5 ppm
——
——
2-Butanone
(Methyl ethyl ketone)
78-93-3
200 ppm
300 ppm
——
——
2-Butoxy ethanol
(Butyl cellosolve)
111-76-2
25 ppm
38 ppm
——
X
n-Butyl acetate
123-86-4
150 ppm
200 ppm
——
——
sec-Butyl acetate
105-46-4
200 ppm
250 ppm
——
——
tert-Butyl acetate
540-88-5
200 ppm
250 ppm
——
——
Butyl acrylate
141-32-2
10 ppm
20 ppm
——
——
n-Butyl alcohol
71-36-3
——
——
50 ppm
X
sec-Butyl alcohol
78-92-2
100 ppm
150 ppm
——
——
tert-Butyl alcohol
75-65-0
100 ppm
150 ppm
——
——
Butylamine
109-73-9
——
——
5 ppm
X
Butyl cellosolve (2-Butoxy ethanol)
111-76-2
25 ppm
38 ppm
——
——
tert-Butyl chromate
(as Cr)
(see WAC 296-62-08003)
1189-85-1
0.005 mg/m3
——
0.1 mg/m3
X
n-Butyl glycidyl ether (BGE)
2426-08-6
25 ppm
38 ppm
——
——
n-Butyl lactate
138-22-7
5 ppm
10 ppm
—-
——
Butyl mercaptan
109-79-5
0.5 ppm
1.5 ppm
——
——
o-sec-Butylphenol
89-72-5
5 ppm
10 ppm
——
X
p-tert-Butyl-toluene
98-51-1
10 ppm
20 ppm
——
——
Cadmium oxide fume (as Cd)
(see WAC 296-62-074
and 296-155-174)
1306-19-0
0.005 mg/m3
——
——
——
Cadmium dust and salts (as Cd)
(see WAC 296-62-074
and 296-155-174)
7440-43-9
0.005 mg/m3
——
——
——
Calcium arsenate
(see chapter 296-848 WAC)
——
0.01 mg/m3
——
——
——
Calcium carbonate
1317-65-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Calcium cyanamide
156-62-7
0.5 mg/m3
1.5 mg/m3
——
——
Calcium hydroxide
1305-62-0
5 mg/m3
10 mg/m3
——
——
Calcium oxide
1305-78-8
2 mg/m3
4 mg/m3
——
——
Calcium silicate
1344-95-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Calcium sulfate
7778-18-9
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Camphor (synthetic)
76-22-2
2 mg/m3
4 mg/m3
——
——
Caprolactam
105-60-2
——
——
——
——
Dust
——
1 mg/m3
3 mg/m3
——
——
Vapor
——
5 ppm
10 ppm
——
——
Captafol
(Difolatan)
2425-06-1
0.1 mg/m3
0.3 mg/m3
——
X
Captan
133-06-2
5 mg/m3
10 mg/m3
——
——
Carbaryl (Sevin)
63-25-2
5 mg/m3
10 mg/m3
——
——
Carbofuran (Furadon)
1563-66-2
0.1 mg/m3
0.3 mg/m3
——
——
Carbon black
1333-86-4
3.5 mg/m3
7 mg/m3
——
——
Carbon dioxide
124-38-9
5,000 ppm
30,000 ppm
——
——
Carbon disulfide
75-15-0
4 ppm
12 ppm
——
X
Carbon monoxide
630-08-0
35 ppm
200 ppm (5 min.)
1,500 ppm
——
Carbon tetrabromide
558-13-4
0.1 ppm
0.3 ppm
——
——
Carbon tetrachloride
(Tetrachloromethane)
56-23-5
2 ppm
4 ppm
——
X
Carbonyl chloride
(Phosgene)
7803-51-2
0.1 ppm
0.3 ppm
——
——
Carbonyl fluoride
353-50-4
2 ppm
5 ppm
——
——
Catechol (Pyrocatechol)
120-80-9
5 ppm
10 ppm
——
X
Cellosolve acetate
(2-Ethoxyethylacetate)
111-15-9
5 ppm
10 ppm
——
X
Cellulose (paper fiber)
9004-34-6
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Cesium hydroxide
21351-79-1
2 mg/m3
4 mg/m3
——
——
Chlordane
57-74-9
0.5 mg/m3
1.5 mg/m3
——
X
Chlorinated camphene
(Toxaphen)
8001-35-2
0.5 mg/m3
1 mg/m3
——
X
Chlorinated diphenyl oxide
55720-99-5
0.5 mg/m3
1.5 mg/m3
——
——
Chlorine
7782-50-5
0.5 ppm
——
1 ppm
——
Chlorine dioxide
10049-04-4
0.1 ppm
0.3 ppm
——
——
Chlorine trifluoride
7790-91-2
——
——
0.1 ppm
——
Chloroacetaldehyde
107-20-0
——
——
1 ppm
——
a-Chloroacetophenone
(Phenacyl chloride)
532-21-4
0.05 ppm
0.15 ppm
——
——
Chloroacetyl chloride
79-04-9
0.05 ppm
0.15 ppm
——
——
Chlorobenzene
(Monochlorobenzene)
108-90-7
75 ppm
113 ppm
——
——
o-Chlorobenzylidene
malononitrile (OCBM)
2698-41-1
——
——
0.05 ppm
X
Chlorobromomethane
74-97-5
200 ppm
250 ppm
——
——
2-Chloro-1, 3-butadiene
(beta-Chloroprene)
126-99-8
10 ppm
20 ppm
——
X
Chlorodifluoromethane
75-45-6
1,000 ppm
1,250 ppm
——
——
Chlorodiphenyl
(42% Chlorine) (PCB)
(Polychlorobiphenyls)
53469-21-9
1 mg/m3
3 mg/m3
——
X
Chlorodiphenyl
(54% Chlorine)
(Polychlorobiphenyls
(PCB))
11097-69-1
0.5 mg/m3
1.5 mg/m3
——
X
1-Chloro-2, 3-epoxypropane
(Epichlorhydrin)
106-89-8
2 ppm
4 ppm
——
X
2-Chloroethanol
(Ethylene chlorohydrin)
107-07-3
——
——
1 ppm
X
Chloroethylene
(vinyl chloride)
(See WAC 296-62-07329)
75-01-4
1 ppm
5 ppm
——
——
Chloroform (Trichloromethane)
67-66-3
2 ppm
4 ppm
——
——
1-Chloro-1-nitropropane
600-25-9
2 ppm
4 ppm
——
——
bis-Chloromethyl ether
(see WAC 296-62-073)
542-88-1
——
——
——
——
Chloromethyl methyl ether
(Methyl chloromethyl
ether)
(see WAC 296-62-073)
107-30-2
——
——
——
——
Chloropentafluoroethane
76-15-3
1,000 ppm
1,250 ppm
——
——
Chloropicrin (Nitrotrichloromethane)
76-06-2
0.1 ppm
0.3 ppm
——
——
beta-Chloroprene (2-Chloro-1,
3-butadiene)
126-99-8
10 ppm
20 ppm
——
X
o-Chlorostyrene
2039-87-4
50 ppm
75 ppm
——
——
o-Chlorotoluene
95-49-8
50 ppm
75 ppm
——
——
2-Chloro-6-trichloromethyl
pyridine (Nitrapyrin)
1929-82-4
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Chlorpyrifos
2921-88-2
0.2 mg/m3
0.6 mg/m3
——
X
Chromic acid and chromates
(as Cr)
(when the compound is not
covered by WAC
296-62-08003)
Varies with
compound
——
——
0.1 mg/m3
——
Chromium
——
——
——
——
——
Chromium (VI) compounds
(as Cr) (when the compound
is covered by
WAC 296-62-08003)
——
0.005 mg/m3
——
——
——
Chromium metal
or Chromium (II) compounds
Or
Chromium (III) compounds
7440-47-3
0.5 mg/m3
——
——
——
Chromyl chloride (as Cr)
(see WAC 296-62-08003)
14977-61-8
0.005 mg/m3
——
——
——
Chrysene (Coal tar
pitch volatiles)
65996-93-2
0.2 mg/m3
0.6 mg/m3
——
——
Chrysotile (as asbestos)
(see WAC 296-62-077
and chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Clopidol
2971-90-6
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Coal dust (less than 5% SiO2)
——
——
——
——
——
Respirable fraction
——
2 mg/m3
4 mg/m3
——
——
Coal dust (greater than or
equal to 5% SiO2)
——
——
——
——
——
Respirable fraction
——
0.1 mg/m3
0.3 mg/m3
——
——
Coal tar pitch volatiles
(benzene soluble fraction)
Acridine
Anthracene
Benzo (a) pyrene
Chrysene
Phenanthrene
Pyrene
65996-93-2
0.2 mg/m3
0.6 mg/m3
——
——
Cobalt, metal fume & dust
(as Co)
7440-48-4
0.05 mg/m3
0.15 mg/m3
——
——
Cobalt carbonyl (as Co)
10210-68-1
0.1 mg/m3
0.3 mg/m3
——
——
Cobalt hydrocarbonyl (as Co)
16842-03-8
0.1 mg/m3
0.3 mg/m3
——
——
Coke oven emissions
(see WAC 296-62-200)
——
0.15 mg/m3
——
——
——
Copper (as Cu)
7440-50-8
——
——
——
——
Fume
——
0.1 mg/m3
0.3 mg/m3
——
——
Dusts and mists
——
1 mg/m3
3 mg/m3
——
——
Cotton dust (raw) (waste sorting, blending, cleaning, willowing and garetting) (see WAC 296-62-14533)
——
1 mg/m3
——
——
——
Corundum (Aluminum oxide)
7429-90-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Crag herbicide (Sesone, Sodium-2,
4-dichloro-phenoxyethyl
sulfate)
136-78-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Cresol (all isomers)
1319-77-3
5 ppm
10 ppm
——
X
Crocidolite (as asbestos)
(see WAC 296-62-077 and
chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Crotonaldehyde
123-73-9;
4170-30-3
2 ppm
4 ppm
——
——
Crufomate
299-86-5
5 mg/m3
10 mg/m3
——
——
Cumene
98-82-8
50 ppm
75 ppm
——
X
Cyanamide
420-04-2
2 mg/m3
4 mg/m3
——
——
Cyanide (as CN)
Varies with
compound
5 mg/m3
10 mg/m3
——
X
Cyanogen
460-19-5
10 ppm
20 ppm
——
——
Cyanogen chloride
506-77-4
——
——
0.3 ppm
——
Cyclohexane
110-82-7
300 ppm
375 ppm
——
——
Cyclohexanol
108-93-0
50 ppm
75 ppm
——
X
Cyclohexanone
108-94-1
25 ppm
38 ppm
——
X
Cyclohexene
110-83-8
300 ppm
375 ppm
——
——
Cyclohexylamine
108-91-8
10 ppm
20 ppm
——
——
Cyclonite (RDX)
121-82-4
1.5 mg/m3
3.0 mg/m3
——
X
Cyclopentadiene
542-92-7
75 ppm
113 ppm
——
——
Cyclopentane
287-92-3
600 ppm
750 ppm
——
——
Cyhexatin (Tricyclohexyltin
hydroxide)
13121-70-5
5 mg/m3
10 mg/m3
——
——
2,4-D (Dichlorophenoxy-
acetic acid)
94-75-7
10 mg/m3
20 mg/m3
——
——
DBCP (1,2-Dibromo-3-
chloropropane)
(See WAC 296-62-07342)
96-12-8
0.001 ppm
——
0.005 ppm
——
DDT (Dichlorodiphenyltri-
chloroethane)
50-29-3
1 mg/m3
3 mg/m3
——
X
DDVP, (Dichlorvos)
62-73-7
0.1 ppm
0.3 ppm
——
X
Dasanit
(Fensulfothion)
115-90-2
0.1 mg/m3
0.3 mg/m3
——
——
Decaborane
17702-41-9
0.05 ppm
0.15 ppm
——
X
Demeton
8065-48-3
0.01 ppm
0.03 ppm
——
X
Diacetone alcohol
(4-hydroxy-4-methyl-
2-pentanone)
123-42-2
50 ppm
75 ppm
——
——
1, 2-Diaminoethane
(Ethylenediamine)
107-15-3
10 ppm
20 ppm
——
——
Diazinon
333-41-5
0.1 mg/m3
0.3 mg/m3
——
X
Diazomethane
334-88-3
0.2 ppm
0.6 ppm
——
——
Diborane
19287-45-7
0.1 ppm
0.3 ppm
——
——
Dibrom (see Naled)
300-76-5
3 mg/m3
6 mg/m3
——
X
1, 2-Dibromo-3-chloropropane
(DBCP)
(see WAC
296-62-07342)
96-12-8
0.001 ppm
——
0.005 ppm
——
2-N-Dibutylamino ethanol
102-81-8
2 ppm
4 ppm
——
X
Dibutyl phosphate
107-66-4
1 ppm
2 ppm
——
——
Dibutyl phthalate
84-74-2
5 mg/m3
10 mg/m3
——
——
Dichloroacetylene
7572-29-4
——
——-
0.1 ppm
——
o-Dichlorobenzene
95-50-1
——
——
50 ppm
——
p-Dichlorobenzene
106-46-7
75 ppm
110 ppm
——
——
3, 3'-Dichlorobenzidine
(see WAC 296-62-073)
91-94-1
——
——
——
——
Dichlorodiphenyltri-
chloroethane (DDT)
50-29-3
1 mg/m3
3 mg/m3
——
X
Dichlorodifluoromethane
75-71-8
1,000 ppm
1,250 ppm
——
——
1, 3-Dichloro-5, 5-dimethyl
hydantoin
118-52-5
0.2 mg/m3
0.4 mg/m3
——
——
1, 1-Dichloroethane
(Ethylidine chloride)
75-34-3
100 ppm
150 ppm
——
——
1, 2-Dichloroethane
(Ethylene dichloride)
107-06-2
1 ppm
2 ppm
——
——
1, 1-Dichloroethylene
(Vinylidene chloride)
75-35-4
1 ppm
3 ppm
——
——
1, 2-Dichloroethylene (Acetylene
dichloride)
540-59-0
200 ppm
250 ppm
——
——
Dichloroethyl ether
111-44-4
5 ppm
10 ppm
——
X
Dichlorofluoromethane
75-43-4
10 ppm
20 ppm
——
——
Dichloromethane
(Methylene chloride)
(See chapter 296-859 WAC)
75-09-2
25 ppm
125 ppm
——
——
1, 1-Dichloro-1-nitroethane
594-72-9
2 ppm
10 ppm
——
——
Dichlorophenoxyacetic acid
(2, 4-D)
94-75-7
10 mg/m3
20 mg/m3
——
——
1, 2-Dichloropropane
(Propylene dichloride)
78-87-5
75 ppm
110 ppm
——
——
Dichloropropene
542-75-6
1 ppm
3 ppm
——
X
2, 2-Dichloropropionic acid
75-99-0
1 ppm
3 ppm
——
——
Dichlorotetrafluoroethane
76-14-2
1,000 ppm
1,250 ppm
——
——
Dichlorvos (DDVP)
62-73-7
0.1 ppm
0.3 ppm
——
X
Dicrotophos
141-66-2
0.25 mg/m3
0.75 mg/m3
——
X
Dicyclopentadiene
77-73-6
5 ppm
10 ppm
——
——
Dicyclopentadienyl iron
102-54-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Dieldrin
60-57-1
0.25 mg/m3
0.75 mg/m3
——
X
Diethanolamine
111-42-2
3 ppm
6 ppm
——
——
Diethylamine
109-89-7
10 ppm
25 ppm
——
——
2-Diethylaminoethanol
100-37-8
10 ppm
20 ppm
——
X
Diethylene triamine
111-40-0
1 ppm
3 ppm
——
X
Diethyl ether (Ethyl ether)
60-29-7
400 ppm
500 ppm
——
——
Diethyl ketone
96-22-0
200 ppm
250 ppm
——
——
Diethyl phthalate
84-66-2
5 mg/m3
10 mg/m3
——
——
Difluorodibromomethane
75-61-6
100 ppm
150 ppm
——
——
Difolatan (Captafol)
2425-06-1
0.1 mg/m3
0.3 mg/m3
——
X
Diglycidyl ether (DGE)
2238-07-5
0.1 ppm
0.3 ppm
——
——
Dihydroxybenzene
(Hydroquinone)
123-31-9
2 mg/m3
4 mg/m3
——
——
Diisobutyl ketone (2, 6-
Dimethylheptanone)
108-83-8
25 ppm
38 ppm
——
——
Diisopropylamine
108-18-9
5 ppm
10 ppm
——
X
Dimethoxymethane (Methylal)
109-87-5
1,000 ppm
1,250 ppm
——
——
Dimethyl acetamide
127-19-5
10 ppm
20 ppm
——
X
Dimethylamine
124-40-3
10 ppm
20 ppm
——
——
4-Dimethylaminoazo benzene
(see WAC 296-62-073)
60-11-7
——
——
——
——
Dimethylaminobenzene
(Xylidene)
1300-73-8
2 ppm
4 ppm
——
X
Dimethylaniline
(N, N-Dimethylaniline)
121-69-7
5 ppm
10 ppm
——
X
Dimethylbenzene (Xylene)
1300-73-8
100 ppm
150 ppm
——
——
Dimethyl-1, 2-dibromo-2,
2-dichloroethyl phosphate
(Naled)
300-76-5
3 mg/m3
6 mg/m3
——
X
Dimethylformamide
68-12-2
10 ppm
20 ppm
——
X
2, 6-Dimethylheptanone
(Diisobutyl ketone)
108-83-8
25 ppm
38 ppm
——
——
1, 1-Dimethylhydrazine
57-14-7
0.5 ppm
1.5 ppm
——
X
Dimethyl phthalate
131-11-3
5 mg/m3
10 mg/m3
——
——
Dimethyl sulfate
77-78-1
0.1 ppm
0.3 ppm
——
X
Dinitolmide
(3, 5-Dinitro-o-toluamide)
148-01-6
5 mg/m3
10 mg/m3
——
——
Dinitrobenzene (all isomers -
alpha, meta and para)
528-29-0;
99-65-0;
100-25-4
0.15 ppm
0.45 ppm
——
X
Dinitro-o-cresol
534-52-1
0.2 mg/m3
0.6 mg/m3
——
X
3, 5-Dinitro-o-toluamide
(Dinitolmide)
148-01-6
5 mg/m3
10 mg/m3
——
——
Dinitrotoluene
25321-14-6
1.5 mg/m3
3 mg/m3
——
X
Dioxane (Diethylene dioxide)
123-91-1
25 ppm
38 ppm
——
X
Dioxathion
78-34-2
0.2 mg/m3
0.6 mg/m3
——
X
Diphenyl (Biphenyl)
92-52-4
0.2 ppm
0.6 ppm
——
——
Diphenylamine
122-39-4
10 mg/m3
20 mg/m3
——
——
Diphenylmethane diisocyanate
(Methylene bisphenyl isocyanate (MDI))
101-68-8
——
——
0.02 ppm
——
Dipropylene glycol methyl ether
34590-94-8
100 ppm
150 ppm
——
X
Dipropyl ketone
123-19-3
50 ppm
75 ppm
——
——
Diquat
85-00-7
0.5 mg/m3
1.5 mg/m3
——
——
Di-sec, Octyl phthalate
(Di-2-ethylhexylphthalate)
117-81-7
5 mg/m3
10 mg/m3
——
——
Disulfram
97-77-8
2 mg/m3
4 mg/m3
——
——
Disulfoton
298-04-4
0.1 mg/m3
0.3 mg/m3
——
X
2, 6-Di-tert-butyl-p-cresol
128-37-0
10 mg/m3
20 mg/m3
——
——
Diuron
330-54-1
10 mg/m3
20 mg/m3
——
——
Divinyl benzene
1321-74-0
10 ppm
20 ppm
——
——
Emery
12415-34-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Endosulfan (Thiodan)
115-29-7
0.1 mg/m3
0.3 mg/m3
——
X
Endrin
72-20-8
0.1 mg/m3
0.3 mg/m3
——
X
Epichlorhydrin (1-Chloro-2,
3-epoxypropane)
106-89-8
2 ppm
4 ppm
——
X
EPN
2104-64-5
0.5 mg/m3
1.5 mg/m3
——
X
1, 2-Epoxypropane
(Propylene oxide)
75-56-9
20 ppm
30 ppm
——
——
2, 3-Epoxy-1-propanol
(Glycidol)
556-52-5
25 ppm
38 ppm
——
——
Ethane
——
Simple asphyxiant
——
——
——
Ethanethiol
(Ethyl mercaptan)
75-08-1
0.5 ppm
1.5 ppm
——
——
Ethanol
(Ethyl alcohol)
64-17-5
1,000 ppm
1,250 ppm
——
——
Ethanolamine (2-Aminoethanol)
141-43-5
3 ppm
6 ppm
——
——
Ethion
563-12-2
0.4 mg/m3
1.2 mg/m3
——
X
2-Ethoxyethanol (Glycol
monoethyl ether)
110-80-5
5 ppm
10 ppm
——
X
2-Ethoxyethyl acetate
(Cellosolve acetate)
111-15-9
5 ppm
10 ppm
——
X
Ethyl acetate
141-78-6
400 ppm
500 ppm
——
——
Ethyl acrylate
140-88-5
5 ppm
25 ppm
——
X
Ethyl alcohol (ethanol)
64-17-5
1,000 ppm
1,250 ppm
——
——
Ethylamine
75-04-07
10 ppm
20 ppm
——
——
Ethyl amyl ketone
(5-Methyl-3-hepatone)
541-85-5
25 ppm
38 ppm
——
——
Ethyl benzene
100-41-4
100 ppm
125 ppm
——
——
Ethyl bromide
74-96-4
200 ppm
250 ppm
——
——
Ethyl butyl ketone
(3-Heptanone)
106-35-4
50 ppm
75 ppm
——
——
Ethyl chloride
75-00-3
1,000 ppm
1,250 ppm
——
——
Ethylene
74-85-1
Simple asphyxiant
——
——
——
Ethylene chlorohydrin
(2-Chloroethanol)
107-07-3
——
——
1 ppm
X
Ethylenediamine (1,2-
Diaminoethane)
107-15-3
10 ppm
20 ppm
——
X
Ethylene dibromide
106-93-4
0.1 ppm
0.5 ppm
——
——
Ethylene dichloride
(1,2-Dichloroethane)
107-06-2
1 ppm
2 ppm
——
——
Ethylene glycol
107-21-1
——
——
50 ppm
——
Ethylene glycol dinitrate
628-96-6
——
0.1 mg/m3
——
X
Ethylene glycol monomethyl ether
acetate (Methyl cellosolve acetate)
——
5 ppm
10 ppm
——
X
Ethyleneimine
(see WAC 296-62-073)
151-56-4
——
——
——
X
Ethylene oxide
(see chapter 296-855 WAC)
75-21-8
1 ppm
5 ppm
——
——
Ethyl ether (Diethyl ether)
60-29-7
400 ppm
500 ppm
——
——
Ethyl formate
109-94-4
100 ppm
125 ppm
——
——
Ethylidine chloride
(1, 1-Dichloroethane)
107-06-2
1 ppm
2 ppm
——
——
Ethylidene norbornene
16219-75-3
——
——
5.0 ppm
——
Ethyl mercaptan (Ethanethiol)
75-08-1
0.5 ppm
1.5 ppm
——
——
n-Ethylmorpholine
100-74-3
5 ppm
10 ppm
——
X
Ethyl sec-amyl ketone
(5-methyl-3-heptanone)
541-85-5
25 ppm
38 ppm
——
——
Ethyl silicate
78-10-4
10 ppm
20 ppm
——
——
Fenamiphos
22224-92-6
0.1 mg/m3
0.3 mg/m3
——
X
Fensulfothion (Dasanit)
115-90-2
0.1 mg/m3
0.3 mg/m3
——
——
Fenthion
55-38-9
0.2 mg/m3
0.6 mg/m3
——
X
Ferbam
——
——
——
——
——
Total particulate
14484-64-1
10 mg/m3
20 mg/m3
——
——
Ferrovanadium dust
12604-58-9
1 mg/m3
3 mg/m3
——
——
Fluorides (as F)
Varies with
compound
2.5 mg/m3
5 mg/m3
——
——
Fluorine
7782-41-4
0.1 ppm
0.3 ppm
——
——
Fluorotrichloromethane
(see Trichlorofluoro methane)
75-69-4
——
——
1,000 ppm
——
Fonofos
944-22-9
0.1 mg/m3
0.3 mg/m3
——
X
Formaldehyde
(see chapter 296-856 WAC)
50-00-0
0.75 ppm
2 ppm
——
——
Formamide
75-12-7
20 ppm
30 ppm
——
——
Formic acid
64-18-6
5 ppm
10 ppm
——
——
Furadon
(carbofuran)
1563-66-2
0.1 mg/m3
0.3 mg/m3
——
——
Furfural
98-01-1
2 ppm
4 ppm
——
X
Furfuryl alcohol
98-00-0
10 ppm
15 ppm
——
X
Gasoline
8006-61-9
300 ppm
500 ppm
——
——
Germanium tetrahydride
7782-65-2
0.2 ppm
0.6 ppm
——
——
Glass, fibrous or dust
——
10 mg/m3
20 mg/m3
——
——
Glutaraldehyde
111-30-8
——
——
0.2 ppm
——
Glycerin mist
56-81-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Glycidol
(2, 3-Epoxy-1-propanol)
556-52-5
25 ppm
38 ppm
——
——
Glycol monoethyl ether
(2-Ethoxyethanol)
110-80-5
5 ppm
10 ppm
——
X
Grain dust (oat, wheat, barley)
——
10 mg/m3
20 mg/m3
——
——
Graphite, natural
7782-42-5
——
——
——
——
Respirable particulate
——
2.5 mg/m3
5 mg/m3
——
——
Graphite, synthetic
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Guthion
(Azinphosmethyl)
86-50-0
0.2 mg/m3
0.6 mg/m3
——
X
Gypsum
13397-24-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Hafnium
7440-58-6
0.5 mg/m3
1.5 mg/m3
——
——
Helium
——
Simple asphyxiant
——
——
——
Heptachlor
76-44-8
0.5 mg/m3
1.5 mg/m3
——
X
Heptane (n-heptane)
142-82-5
400 ppm
500 ppm
——
——
2-Heptanone
(Methyl n-amyl ketone)
110-43-0
50 ppm
75 ppm
——
——
3-Heptanone
(Ethyl butyl ketone)
106-35-4
50 ppm
75 ppm
——
——
Hexachlorobutadiene
87-68-3
0.02 ppm
0.06 ppm
——
X
Hexachlorocyclopentadiene
77-47-4
0.01 ppm
0.03 ppm
——
——
Hexachloroethane
67-72-1
1 ppm
3 ppm
——
X
Hexachloronaphthalene
1335-87-1
0.2 mg/m3
0.6 mg/m3
——
X
Hexafluoroacetone
684-16-2
0.1 ppm
0.3 ppm
——
X
Hexane
——
——
——
——
——
n-hexane
110-54-3
50 ppm
75 ppm
——
——
other isomers
Varies with
compound
500 ppm
1,000 ppm
——
——
2-Hexanone
(Methyl-n-butyl ketone)
591-78-6
5 ppm
10 ppm
——
——
Hexone
(Methyl isobutyl ketone)
108-10-1
50 ppm
75 ppm
——
——
sec-Hexyl acetate
108-84-9
50 ppm
75 ppm
——
——
Hexylene glycol
107-41-5
——
——
25 ppm
——
Hydrazine
302-01-2
0.1 ppm
0.3 ppm
——
X
Hydrogen
——
Simple asphyxiant
——
——
——
Hydrogenated terphenyls
61788-32-7
0.5 ppm
1.5 ppm
——
——
Hydrogen bromide
10035-10-6
——
——
3.0 ppm
——
Hydrogen chloride
7647-01-0
——
——
5.0 ppm
——
Hydrogen cyanide
74-90-8
——
4.7 ppm
——
X
Hydrogen fluoride
7664-39-3
——
——
3 ppm
——
Hydrogen peroxide
7722-84-1
1 ppm
3 ppm
——
——
Hydrogen selenide (as Se)
7783-07-5
0.05 ppm
0.15 ppm
——
——
Hydrogen sulfide
7783-06-4
10 ppm
15 ppm
——
——
Hydroquinone
(Dihydroxybenzene)
123-31-9
2 mg/m3
4 mg/m3
——
——
4-Hydroxy-4-methyl-2-pentanone
(Diacetone alcohol)
123-42-2
50 ppm
75 ppm
——
——
2-Hydroxypropyl acrylate
99-61-1
0.5 ppm
1.5 ppm
——
X
Indene
95-13-6
10 ppm
20 ppm
——
——
Indium and compounds (as In)
7440-74-6
0.1 mg/m3
0.3 mg/m3
——
——
Iodine
7553-56-2
——
——
0.1 ppm
——
Iodoform
75-47-8
0.6 ppm
1.8 ppm
——
——
Iron oxide dust and fume (as Fe)
1309-37-1
——
——
——
——
Total particulate
——
5 mg/m3
10 mg/m3
——
——
Iron pentacarbonyl (as Fe)
13463-40-6
0.1 ppm
0.2 ppm
——
——
Iron salts, soluble (as Fe)
Varies with
compound
1 mg/m3
3 mg/m3
——
——
Isoamyl acetate
123-92-2
100 ppm
150 ppm
——
——
Isoamyl alcohol
(primary and secondary)
123-51-3
100 ppm
125 ppm
——
——
Isobutyl acetate
110-19-0
150 ppm
188 ppm
——
——
Isobutyl alcohol
78-83-1
50 ppm
75 ppm
——
——
Isooctyl alcohol
26952-21-6
50 ppm
75 ppm
——
X
Isophorone
78-59-1
4 ppm
——
5 ppm
——
Isophorone diisocyanate
4098-71-9
0.005 ppm
0.02 ppm
——
X
Isopropoxyethanol
109-59-1
25 ppm
38 ppm
——
——
Isopropyl acetate
108-21-4
250 ppm
310 ppm
——
——
Isopropyl alcohol
67-63-0
400 ppm
500 ppm
——
——
Isopropylamine
75-31-0
5 ppm
10 ppm
——
——
N-Isopropylaniline
768-52-5
2 ppm
4 ppm
——
X
Isopropyl ether
108-20-3
250 ppm
313 ppm
——
——
Isopropyl glycidyl ether (IGE)
4016-14-2
50 ppm
75 ppm
——-
——
Kaolin
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Ketene
463-51-4
0.5 mg/m3
1.5 mg/m3
——
——
Lannate
(Methomyl)
16752-77-5
2.5 mg/m3
5 mg/m3
——
——
Lead, inorganic (as Pb)
(see WAC 296-62-07521
and 296-155-176)
7439-92-1
0.05 mg/m3
——
——
——
Lead arsenate (as Pb)
(see WAC 296-62-07521,
296-155-176, and chapter
296-848 WAC)
3687-31-8
0.05 mg/m3
——
——
——
Lead chromate (as Pb)
(see WAC 296-62-08003,
296-62-07521, and
296-155-176)
7758-97-6
0.05 mg/m3
——
——
——
Limestone
1317-65-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Lindane
58-89-9
0.5 mg/m3
1.5 mg/m3
——
X
Lithium hydride
7580-67-8
0.025 mg/m3
0.075 mg/m3
——
——
L.P.G.
(liquified petroleum gas)
68476-85-7
1,000 ppm
1,250 ppm
——
——
Magnesite
546-93-0
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Magnesium oxide fume
1309-48-4
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Malathion
121-75-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
X
Maleic anhydride
108-31-6
0.25 ppm
0.75 ppm
——
——
Manganese and compounds (as Mn)
7439-96-5
——
——
5 mg/m3
——
Manganese cyclopentadienyl
tricarbonyl (as Mn)
12079-65-1
0.1 mg/m3
0.3 mg/m3
——
X
Manganese tetroxide and
fume (as Mn)
7439-96-5
1 mg/m3
3 mg/m3
——
——
Marble
1317-65-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
MBOCA
(4, 4'-Methylene bis
(2-chloro-aniline))
(see WAC 296-62-073)
101-14-4
——
——
——
X
MDA
(4, 4-Methylene dianiline)
(see WAC 296-62-076
and 296-155-173)
101-77-9
0.01 ppm
0.1 ppm
——
X
MDI
(Methylene bisphenyl
isocyanate)
(Diphenylmethane
diisocyanate)
101-68-8
——
——
0.02 ppm
——
MEK
(Methyl ethyl ketone)
(2-Butanone)
78-93-3
200 ppm
300 ppm
——
——
MEKP
(Methyl ethyl ketone peroxide)
1338-23-4
——
——
0.2 ppm
——
Mercury (as Hg)
7439-97-6
——
——
——
——
Aryl and inorganic
——
0.1 mg/m3
0.3 mg/m3
——
X
Organo-alkyl compounds
——
0.01 mg/m3
0.03 mg/m3
——
X
Vapor
——
0.05 mg/m3
0.15 mg/m3
——
X
Mesityl oxide
141-79-7
15 ppm
25 ppm
——
——
Methacrylic acid
79-41-4
20 ppm
30 ppm
——
X
Methane
——
Simple asphyxiant
——
——
——
Methanethiol
(Methyl mercaptan)
74-93-1
0.5 ppm
1.5 ppm
——
——
Methanol
(Methyl alcohol)
67-56-1
200 ppm
250 ppm
——
X
Methomyl (lannate)
16752-77-5
2.5 mg/m3
5 mg/m3
——
——
Methoxychlor
72-43-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
2-Methoxyethanol
(Methyl cellosolve)
109-86-4
5 ppm
10 ppm
——
X
2-Methoxyethyl acetate
(Methyl cellosolve acetate)
110-49-6
5 ppm
10 ppm
——
X
4-Methoxyphenol
150-76-5
5 mg/m3
10 mg/m3
——
——
Methyl acetate
79-20-9
200 ppm
250 ppm
——
——
Methyl acetylene (propyne)
74-99-7
1,000 ppm
1,250 ppm
——
——
Methyl acetylene-propadiene
mixture (MAPP)
——
1,000 ppm
1,250 ppm
——
——
Methyl acrylate
96-33-3
10 ppm
20 ppm
——
X
Methylacrylonitrile
126-98-7
1 ppm
3 ppm
——
X
Methylal (Dimethoxy-methane)
109-87-5
1,000 ppm
1,250 ppm
——
——
Methyl alcohol (methanol)
67-56-1
200 ppm
250 ppm
——
X
Methylamine
74-89-5
10 ppm
20 ppm
——
——
Methyl amyl alcohol
(Methyl isobutyl carbinol)
108-11-2
25 ppm
40 ppm
——
X
Methyl n-amyl ketone
(2-Heptanone)
110-43-0
50 ppm
75 ppm
——
——
N-Methyl aniline
(Monomethyl aniline)
100-61-8
0.5 ppm
1.5 ppm
——
X
Methyl bromide
74-83-9
5 ppm
10 ppm
——
X
Methyl-n-butyl ketone
(2-Hexanone)
591-78-6
5 ppm
10 ppm
——
——
Methyl cellosolve
(2-Methoxyethanol)
109-86-4
5 ppm
10 ppm
——
X
Methyl cellosolve acetate
(2-Methoxyethyl acetate)
110-49-6
5 ppm
10 ppm
——
X
Methyl chloride
74-87-3
50 ppm
100 ppm
——
——
Methyl chloroform
(1, 1, 1-trichlorethane)
71-55-6
350 ppm
450 ppm
——
——
Methyl chloromethyl ether
(chloromethyl methyl
ether)
(see WAC 296-62-073)
107-30-2
——
——
——
——
Methyl 2-cyanoacrylate
137-05-3
2 ppm
4 ppm
——
——
Methylcyclohexane
108-87-2
400 ppm
500 ppm
——
——
Methylcyclohexanol
25639-42-3
50 ppm
75 ppm
——
——
Methylcyclohexanone
583-60-8
50 ppm
75 ppm
——
X
Methylcyclopentadienyl
manganese tricarbonyl (as Mn)
12108-13-3
0.2 mg/m3
0.6 mg/m3
——
X
Methyl demeton
8022-00-2
0.5 mg/m3
1.5 mg/m3
——
X
Methylene bisphenyl isocyanate
(MDI)
(Diphenylmethane diisocyanate)
101-68-8
——
——
0.02 ppm
——
4, 4'-Methylene bis
(2-chloro-aniline) (MBOCA)
(see WAC 296-62-073)
101-14-4
——
——
——
X
Methylene bis
(4-cyclohexylisocyanate)
5124-30-1
——
——
0.01 ppm
——
Methylene chloride
(Dichloromethane)
(see chapter 296-859 WAC)
75-09-2
25 ppm
125 ppm
——
——
4, 4-Methylene dianiline (MDA)
(see WAC 296-62-076
and 296-155-173)
101-77-9
0.01 ppm
0.1 ppm
——
X
Methyl ethyl ketone (MEK)
(2-Butanone)
78-93-3
200 ppm
300 ppm
——
——
Methyl ethyl ketone peroxide
(MEKP)
1338-23-4
——
——
0.2 ppm
——
Methyl formate
107-31-3
100 ppm
150 ppm
——
——
5-Methyl-3-heptanone
(Ethyl amyl ketone)
541-85-5
25 ppm
38 ppm
——
——
Methyl hydrazine
(Monomethyl hydrazine)
60-34-4
——
——
0.2 ppm
X
Methyl iodide
74-88-4
2 ppm
4 ppm
——
X
Methyl isoamyl ketone
110-12-3
50 ppm
75 ppm
——
——
Methyl isobutyl carbinol
(Methyl amyl alcohol)
108-11-2
25 ppm
40 ppm
——
X
Methyl isobutyl ketone
(Hexone)
108-10-1
50 ppm
75 ppm
——
——
Methyl isocyanate
624-83-9
0.02 ppm
0.06 ppm
——
X
Methyl isopropyl ketone
563-80-4
200 ppm
250 ppm
——
——
Methyl mercaptan (Methanethiol)
74-93-1
0.5 ppm
1.5 ppm
——
——
Methyl methacrylate
80-62-6
100 ppm
150 ppm
——
——
Methyl parathion
298-00-0
0.2 mg/m3
0.6 mg/m3
——
X
Methyl propyl ketone
(2-Pentanone)
107-87-9
200 ppm
250 ppm
——
——
Methyl silicate
684-84-5
1 ppm
3 ppm
——
——
alpha-Methyl styrene
98-83-9
50 ppm
100 ppm
——
——
Mevinphos (Phosdrin)
7786-34-7
0.01 ppm
0.03 ppm
——
X
Metribuzin
21087-64-9
5 mg/m3
10 mg/m3
——
——
Mica (Silicates)
Respirable fraction
12001-26-2
3 mg/m3
6 mg/m3
——
——
Molybdenum (as Mo)
7439-98-7
——
——
——
——
Soluble compounds
——
5 mg/m3
10 mg/m3
——
——
Insoluble compounds
——
10 mg/m3
20 mg/m3
——
——
Monochlorobenzene
(Chlorobenzene)
108-90-7
75 ppm
113 ppm
——
——
Monocrotophos (Azodrin)
6923-22-4
0.25 mg/m3
0.75 mg/m3
——
——
Monomethyl aniline
(N-Methyl aniline)
100-61-8
0.5 ppm
1.5 ppm
——
X
Monomethyl hydrazine
——
——
——
0.2 ppm
——
Morpholine
110-91-8
20 ppm
30 ppm
——
X
Naled (Dibrom)
300-76-5
3 mg/m3
6 mg/m3
——
X
Naphtha
8030-30-6
100 ppm
150 ppm
——
X
Naphthalene
91-20-3
10 ppm
15 ppm
——
——
alpha-Naphthylamine
(see WAC 296-62-073)
134-32-7
——
——
——
——
beta-Naphthylamine
(see WAC 296-62-073)
91-59-8
——
——
——
——
Neon
7440-01-9
Simple asphyxiant
——
——
——
Nickel carbonyl (as Ni)
13463-39-3
0.001 ppm
0.003 ppm
——
——
Nickel (as Ni)
7440-02-0
——
——
——
——
Metal and insoluble
compounds
——
1 mg/m3
3 mg/m3
——
——
Soluble compounds
——
0.1 mg/m3
0.3 mg/m3
——
——
Nicotine
54-11-5
0.5 mg/m3
1.5 mg/m3
——
X
Nitrapyrin
(2-Chloro-6
trichloromethyl pyridine)
1929-82-4
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Nitric acid
7697-37-2
2 ppm
4 ppm
——
——
Nitric oxide
10102-43-9
25 ppm
38 ppm
——
——
p-Nitroaniline
100-01-6
3 mg/m3
6 mg/m3
——
X
Nitrobenzene
98-95-3
1 ppm
3 ppm
——
X
4-Nitrobiphenyl
(see WAC 296-62-073)
92-93-3
——
——
——
——
p-Nitrochlorobenzene
100-00-5
0.5 mg/m3
1.5 mg/m3
——
X
4-Nitrodiphenyl
(see WAC 296-62-073)
——
——
——
——
——
Nitroethane
79-24-3
100 ppm
150 ppm
——
——
Nitrogen
7727-37-9
Simple asphyxiant
——
——
——
Nitrogen dioxide
10102-44-0
——
1 ppm
——
——
Nitrogen oxide
(Nitrous oxide)
10024-97-2
50 ppm
75 ppm
——
——
Nitrogen trifluoride
7783-54-2
10 ppm
20 ppm
——
——
Nitroglycerin
55-63-0
——
0.1 mg/m3
——
X
Nitromethane
75-52-5
100 ppm
150 ppm
——
——
1-Nitropropane
108-03-2
25 ppm
38 ppm
——
——
2-Nitropropane
79-46-9
10 ppm
20 ppm
——
——
N-Nitrosodimethylamine
(see WAC 296-62-073)
62-75-9
——
——
——
——
Nitrotoluene
——
——
——
——
——
o-isomer
88-72-2
2 ppm
4 ppm
——
X
m-isomer
98-08-2
2 ppm
4 ppm
——
X
p-isomer
99-99-0
2 ppm
4 ppm
——
X
Nitrotrichloromethane
(Chloropicrin)
76-06-2
0.1 ppm
0.3 ppm
——
——
Nitrous oxide
(Nitrogen oxide)
10024-97-2
50 ppm
75 ppm
——
——
Nonane
111-84-2
200 ppm
250 ppm
——
——
Nuisance dusts (see Particulates
not otherwise regulated)
——
——
——
——
——
Octachloronaphthalene
2234-13-1
0.1 mg/m3
0.3 mg/m3
——
X
Octane
111-65-9
300 ppm
375 ppm
——
——
Oil mist mineral (particulate)
8012-95-1
5 mg/m3
10 mg/m3
——
——
Osmium tetroxide (as Os)
20816-12-0
0.0002 ppm
0.0006 ppm
——
——
Oxalic acid
144-62-7
1 mg/m3
2 mg/m3
——
——
Oxygen
See requirements in other
chapters such as:
Chapter 296-809 WAC,
Confined spaces; chapter
296-843 WAC, Hazardous
waste operations; chapter
296-824 WAC, Emergency
response; WAC 296-62-100,
Oxygen deficient
atmospheres
——
——
——
——
——
Oxygen difluoride
7783-41-7
——
——
0.05 ppm
——
Ozone
10028-15-6
0.1 ppm
0.3 ppm
——
——
Paper fiber
(Cellulose)
9004-34-6
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Paraffin wax fume
8002-74-2
2 mg/m3
4 mg/m3
——
——
Paraquat
——
——
——
——
——
Respirable fraction
4685-14-7
0.1 mg/m3
0.3 mg/m3
——
X
 
1910-42-5
 
 
 
 
 
2074-50-2
 
 
 
 
Parathion
56-38-2
0.1 mg/m3
0.3 mg/m3
——
X
Particulate polycyclic
aromatic hydrocarbons
(see coal tar pitch volatiles)
 
 
 
——
——
Particulates not otherwise
regulated
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Pentaborane
19624-22-7
0.005 ppm
0.015 ppm
——
——
Pentachloronaphthalene
1321-64-8
0.5 mg/m3
1.5 mg/m3
——
X
Pentachlorophenol
87-86-5
0.5 mg/m3
1.5 mg/m3
——
X
Pentaerythritol
115-77-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Pentane
109-66-0
600 ppm
750 ppm
——
——
2-Pentanone
(methyl propyl ketone)
107-87-9
200 ppm
250 ppm
——
——
Perchloroethylene
(tetrachloroethylene)
127-18-4
25 ppm
38 ppm
——
——
Perchloromethyl mercaptan
594-42-3
0.1 ppm
0.3 ppm
——
——
Perchloryl fluoride
7616-94-6
3 ppm
6 ppm
——
——
Perlite
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Petroleum distillates
(Naptha, rubber solvent)
——
100 ppm
150 ppm
——
——
Phenacyl chloride
(a-Chloroacetophenone)
532-21-4
0.05 ppm
0.15 ppm
——
——
Phenol
108-95-2
5 ppm
10 ppm
——
X
Phenothiazine
92-84-2
5 mg/m3
10 mg/m3
——
X
p-Phenylene diamine
106-50-3
0.1 mg/m3
0.3 mg/m3
——
X
Phenyl ether (vapor)
101-84-8
1 ppm
3 ppm
——
——
Phenyl ether-diphenyl
mixture (vapor)
——
1 ppm
3 ppm
——
——
Phenylethylene (Styrene)
100-42-5
50 ppm
100 ppm
——
——
Phenyl glycidyl ether (PGE)
122-60-1
1 ppm
3 ppm
——
——
Phenylhydrazine
100-63-0
5 ppm
10 ppm
——
X
Phenyl mercaptan
108-98-5
0.5 ppm
1.5 ppm
——
——
Phenylphosphine
638-21-1
——
——
0.05 ppm
——
Phorate
298-02-2
0.05 mg/m3
0.2 mg/m3
——
X
Phosdrin (Mevinphos)
7786-34-7
0.01 ppm
0.03 ppm
——
X
Phosgene (carbonyl chloride)
75-44-5
0.1 ppm
0.3 ppm
——
——
Phosphine
7803-51-2
0.3 ppm
1 ppm
——
——
Phosphoric acid
7664-38-2
1 mg/m3
3 mg/m3
——
——
Phosphorus (yellow)
7723-14-0
0.1 mg/m3
0.3 mg/m3
——
——
Phosphorous oxychloride
10025-87-3
0.1 ppm
0.3 ppm
——
——
Phosphorus pentachloride
10026-13-8
0.1 ppm
0.3 ppm
——
——
Phosphorus pentasulfide
1314-80-3
1 mg/m3
3 mg/m3
——
——
Phosphorus trichloride
12-2-19
0.2 ppm
0.5 ppm
——
——
Phthalic anhydride
85-44-9
1 ppm
3 ppm
——
——
m-Phthalodinitrile
626-17-5
5 mg/m3
10 mg/m3
——
——
Picloram
1918-02-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Picric acid (2, 4, 6-
Trinitrophenol)
88-89-1
0.1 mg/m3
0.3 mg/m3
——
X
Pindone
(2-Pivalyl-1, 3-indandione,
Pival)
83-26-1
0.1 mg/m3
0.3 mg/m3
——
——
Piperazine dihydrochloride
142-64-3
5 mg/m3
10 mg/m3
——
——
Pival (Pindone)
83-26-1
0.1 mg/m3
0.3 mg/m3
——
——
Plaster of Paris
26499-65-0
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Platinum (as Pt)
7440-06-4
——
——
——
——
Metal
——
1 mg/m3
3 mg/m3
——
——
Soluble salts
——
0.002 mg/m3
0.006 mg/m3
——
——
Polychlorobiphenyls
(Chlorodiphenyls)
——
——
——
——
——
42% Chlorine (PCB)
53469-21-9
1 mg/m3
3 mg/m3
——
X
54% Chlorine (PCB)
11097-69-1
0.5 mg/m3
1.5 mg/m3
——
X
Portland cement
65997-15-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Potassium hydroxide
1310-58-3
——
——
2 mg/m3
——
Propane
74-98-6
1,000 ppm
1,250 ppm
——
——
Propargyl alcohol
107-19-7
1 ppm
3 ppm
——
X
beta-Propiolactone
(see WAC 296-62-073)
57-57-8
——
——
——
——
Propionic acid
79-09-4
10 ppm
20 ppm
——
——
Propoxur (Baygon)
114-26-1
0.5 mg/m3
1.5 mg/m3
——
——
n-Propyl acetate
109-60-4
200 ppm
250 ppm
——
——
n-Propyl alcohol
71-23-8
200 ppm
250 ppm
——
X
n-Propyl nitrate
627-13-4
25 ppm
40 ppm
——
——
Propylene
——
Simple asphyxiant
——
——
——
Propylene dichloride
(1, 2-Dichloropropane)
78-87-5
75 ppm
110 ppm
——
——
Propylene glycol dinitrate
6423-43-4
0.05 ppm
0.15 ppm
——
X
Propylene glycol
monomethyl ether
107-98-2
100 ppm
150 ppm
——
——
Propylene imine
75-55-8
2 ppm
4 ppm
——
X
Propylene oxide (1,2-
Epoxypropane)
75-56-9
20 ppm
30 ppm
——
——
Propyne (Methyl acetylene)
74-99-7
1,000 ppm
1,250 ppm
——
——
Pyrethrum
8003-34-7
5 mg/m3
10 mg/m3
——
——
Pyridine
110-86-1
5 ppm
10 ppm
——
——
Pyrocatachol
(Catechol)
120-80-9
5 ppm
10 ppm
——
X
Quinone (p-Benzoquinone)
106-51-4
0.1 ppm
0.3 ppm
——
——
RDX (Cyclonite)
——
1.5 mg/m3
3 mg/m3
——
X
Resorcinol
108-46-3
10 ppm
20 ppm
——
——
Rhodium (as Rh)
7440-16-6
——
——
——
——
Insoluble compounds,
metal fumes and dusts
——
0.1 mg/m3
0.3 mg/m3
——
——
Soluble compounds, salts
——
0.001 mg/m3
0.003 mg/m3
——
——
Ronnel
299-84-3
10 mg/m3
20 mg/m3
——
——
Rosin core solder, pyrolysis
products (as formaldehyde)
8050-09-7
0.1 mg/m3
0.3 mg/m3
——
——
Rotenone
83-79-4
5 mg/m3
10 mg/m3
——
——
Rouge
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Rubber solvent (naphtha)
8030-30-6
100 ppm
150 ppm
——
——
Selenium compounds (as Se)
7782-49-2
0.2 mg/m3
0.6 mg/m3
——
——
Selenium hexafluoride (as Se)
7783-79-1
0.05 ppm
0.15 ppm
——
——
Sesone (Crag herbicide)
136-78-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Sevin
(Carbaryl)
63-25-2
5 mg/m3
10 mg/m3
——
——
Silane (see Silicon tetrahydride)
7803-62-5
5 ppm
10 ppm
——
——
Silica, amorphous, precipitated
and gel
112926-00-8
6 mg/m3
12 mg/m3
——
——
Silica, amorphous, diatomaceous
earth, containing less than
1% crystalline silica
61790-53-2
——
——
——
——
Total particulate
——
6 mg/m3
12 mg/m3
——
——
Respirable fraction
——
3 mg/m3
6 mg/m3
——
——
Silica, crystalline cristobalite
——
——
——
——
——
Respirable fraction
Applies only where the exposure limit in chapter 296-840 WAC is not in effect.
14464-46-1
0.05 mg/m3
0.15 mg/m3
——
——
Silica, crystalline quartz
——
——
——
——
——
Respirable fraction
Applies only where the exposure limit in chapter 296-840 WAC is not in effect.
14808-60-7
0.1 mg/m3
0.3 mg/m3
——
——
Silica, crystalline tripoli
(as quartz)
——
——
——
——
——
Respirable fraction
1317-95-9
0.1 mg/m3
0.3 mg/m3
——
——
Silica, crystalline tridymite
——
——
——
——
——
Respirable fraction
Applies only where the exposure limit in chapter 296-840 WAC is not in effect.
15468-32-3
0.05 mg/m3
0.15 mg/m3
——
——
Silica, fused
——
——
——
——
——
Respirable fraction
60676-86-0
0.1 mg/m3
0.3 mg/m3
——
——
Silicates (less than 1% crystalline silica)
——
——
——
——
——
Mica
——
——
——
——
——
Respirable fraction
12001-26-2
3 mg/m3
6 mg/m3
——
——
Soapstone
——
——
——
——
——
Total particulate
——
6 mg/m3
12 mg/m3
——
——
Respirable fraction
——
3 mg/m3
6 mg/m3
——
——
Talc (containing asbestos)
(as asbestos)
(see WAC
296-62-07705 and
chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Talc (containing no
asbestos)
——
——
——
——
——
Respirable fraction
14807-96-6
2 mg/m3
4 mg/m3
——
——
Tremolite
(asbestiform)
(as asbestos)
(see WAC
296-62-07705
and chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Silicon
7440-21-3
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Silicon carbide
409-21-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Silicon tetrahydride (Silane)
7803-62-5
5 ppm
10 ppm
——
——
Silver, metal dust and soluble
compounds (as Ag)
7440-22-4
0.01 mg/m3
0.03 mg/m3
——
——
Soapstone
——
——
——
——
——
Total particulate
——
6 mg/m3
12 mg/m3
——
——
Respirable fraction
——
3 mg/m3
6 mg/m3
——
——
Sodium azide (as HN3 or NaN3)
26628-22-8
——
——
0.1 ppm
X
Sodium bisulfite
7631-90-5
5 mg/m3
10 mg/m3
——
——
Sodium-2,
4-dichloro-
phenoxyethyl
sulfate
(Crag herbicide)
136-78-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Sodium fluoroacetate
62-74-8
0.05 mg/m3
0.15 mg/m3
——
X
Sodium hydroxide
1310-73-2
——
——
2 mg/m3
——
Sodium metabisulfite
7681-57-4
5 mg/m3
10 mg/m3
——
——
Starch
9005-25-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Stibine
7803-52-3
0.1 ppm
0.3 ppm
——
——
Stoddard solvent
8052-41-3
100 ppm
150 ppm
——
——
Strychnine
57-24-9
0.15 mg/m3
0.45 mg/m3
——
——
Styrene (Phenylethylene,
Vinyl benzene)
100-42-5
50 ppm
100 ppm
——
——
Subtilisins
9014-01-1
——
0.00006 mg/m3
——
——
 
 
 
(60 min.)
 
 
Sucrose
57-50-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Sulfotep (TEDP)
3689-24-5
0.2 mg/m3
0.6 mg/m3
——
X
Sulfur dioxide
7446-09-5
2 ppm
5 ppm
——
——
Sulfur hexafluoride
2551-62-4
1,000 ppm
1,250 ppm
——
——
Sulfuric acid
7664-93-9
1 mg/m3
3 mg/m3
——
——
Sulfur monochloride
10025-67-9
——
——
1 ppm
——
Sulfur pentafluoride
5714-22-1
——
——
0.01 ppm
——
Sulfur tetrafluoride
7783-60-0
——
——
0.1 ppm
——
Sulfuryl fluoride
2699-79-8
5 ppm
10 ppm
——
——
Sulprofos
35400-43-2
1 mg/m3
3 mg/m3
——
——
Systox (Demeton)
8065-48-3
0.01 ppm
0.03 ppm
——
X
2, 4, 5-T (2, 4, 5- tri-
chlorophenoxyacetic acid)
93-76-5
10 mg/m3
20 mg/m3
——
——
Talc (containing asbestos)
(as asbestos)
(see WAC 296-62-07705
and chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Talc (containing no asbestos)
——
——
——
——
——
Respirable fraction
14807-96-6
2 mg/m3
4 mg/m3
——
——
Tantalum
——
——
——
——
——
Metal and oxide dusts
7440-25-7
5 mg/m3
10 mg/m3
——
——
TDI
(Toluene-2, 4-diisocyanate)
584-84-9
0.005 ppm
0.02 ppm
——
——
TEDP (Sulfotep)
3689-24-5
0.2 mg/m3
0.6 mg/m3
——
X
Tellurium and compounds (as Te)
13494-80-9
0.1 mg/m3
0.3 mg/m3
——
——
Tellurium hexafluoride (as Te)
7783-80-4
0.02 ppm
0.06 ppm
——
——
Temephos (Abate)
3383-96-8
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
TEPP
107-49-3
0.004 ppm
0.012 ppm
——
X
Terphenyls
26140-60-3
——
——
0.5 ppm
——
1, 1, 1, 2-Tetrachloro-2,
2-difluoroethane
76-11-0
500 ppm
625 ppm
——
——
1, 1, 2, 2-Tetrachloro-1,
2-difluoroethane
76-12-0
500 ppm
625 ppm
——
——
1, 1, 2, 2-Tetrachloroethane
79-34-5
1 ppm
3 ppm
——
X
Tetrachloroethylene
(Perchloroethylene)
127-18-4
25 ppm
38 ppm
——
——
Tetrachloromethane
(Carbon tetrachloride)
56-23-5
2 ppm
4 ppm
——
X
Tetrachloronaphthalene
1335-88-2
2 mg/m3
4 mg/m3
——
X
Tetraethyl lead (as Pb)
78-00-2
0.075 mg/m3
0.225 mg/m3
——
X
Tetrahydrofuran
109-99-9
200 ppm
250 ppm
——
——
Tetramethyl lead (as Pb)
75-74-1
0.075 mg/m3
0.225 mg/m3
——
X
Tetramethyl succinonitrile
3333-52-6
0.5 ppm
1.5 ppm
——
X
Tetranitromethane
509-14-8
1 ppm
3 ppm
——
——
Tetrasodium pyrophosphate
7722-88-5
5 mg/m3
10 mg/m3
——
——
Tetryl (2, 4, 6-trinitrophenyl-
methylnitramine)
479-45-8
1.5 mg/m3
3 mg/m3
——
X
Thallium (soluble compounds)
(as Tl)
7440-28-0
0.1 mg/m3
0.3 mg/m3
——
X
4, 4-Thiobis
(6-tert-butyl-m-cresol)
96-69-5
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Thiodan
(Endosulfan)
115-29-7
0.1 mg/m3
0.3 mg/m3
——
X
Thioglycolic acid
68-11-1
1 ppm
3 ppm
——-
X
Thionyl chloride
7719-09-7
——
——
1 ppm
——
Thiram
(see WAC 296-62-07519)
137-26-8
5 mg/m3
10 mg/m3
——
——
Tin (as Sn)
——
——
——
——
——
Inorganic compounds
7440-31-5
2 mg/m3
4 mg/m3
——
——
Tin (as Sn)
——
——
——
——
——
Organic compounds
7440-31-5
0.1 mg/m3
0.3 mg/m3
——
X
Tin oxide (as Sn)
21651-19-4
2 mg/m3
4 mg/m3
——
——
Titanium dioxide
13463-67-7
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
TNT
(2, 4, 6-Trinitrotoluene)
118-96-7
0.5 mg/m3
1.5 mg/m3
——
X
Toluene
108-88-3
100 ppm
150 ppm
——
——
Toluene-2, 4-diisocyanate (TDI)
584-84-9
0.005 ppm
0.02 ppm
——-
——
m-Toluidine
108-44-1
2 ppm
4 ppm
——
X
o-Toluidine
95-53-4
2 ppm
4 ppm
——
X
p-Toluidine
106-49-0
2.0 ppm
4 ppm
——
X
Toxaphene
(Chlorinated camphene)
8001-35-2
0.5 mg/m3
1 mg/m3
——
X
Tremolite (asbestiform)
(as asbestos)
(see WAC
296-62-07705 and
chapter 296-65 WAC)
——
0.1 f/cc
1.0 f/cc (30 minutes)
——
——
Tributyl phosphate
126-73-8
0.2 ppm
0.6 ppm
——
——
Trichloroacetic acid
76-03-9
1 ppm
3 ppm
——
——
1, 2, 4-Trichlorobenzene
120-82-1
——
——
5 ppm
——
1, 1, 1-Trichloroethane
(Methyl chloroform)
71-55-6
350 ppm
450 ppm
——
——
1, 1, 2-Trichloroethane
79-00-5
10 ppm
20 ppm
——
——
Trichloroethylene
79-01-6
50 ppm
200 ppm
——
——
Trichlorofluoromethane
(Fluorotrichloromethane)
75-69-4
——
——
1,000 ppm
——
Trichloromethane
(Chloroform)
67-66-3
2 ppm
4 ppm
——
——
Trichloronaphthalene
1321-65-9
5 mg/m3
10 mg/m3
——
X
1, 2, 3-Trichloropropane
96-18-4
10 ppm
20 ppm
——
X
1, 1, 2-Trichloro-1, 2,
2-trifluoroethane
76-13-1
1,000 ppm
1,250 ppm
——
——
Tricyclohexyltin hydroxide
(Cyhexatin)
13121-70-5
5 mg/m3
10 mg/m3
——
——
Triethylamine
121-44-8
10 ppm
15 ppm
——
——
Trifluorobromomethane
75-63-8
1,000 ppm
1,250 ppm
——
——
Trimellitic anhydride
552-30-7
0.005 ppm
0.015 ppm
——
——
Trimethylamine
75-50-3
10 ppm
15 ppm
——
——
Trimethyl benzene
25551-13-7
25 ppm
38 ppm
——
——
Trimethyl phosphite
121-45-9
2 ppm
4 ppm
——
——
2, 4, 6-Trinitrophenol
(Picric acid)
88-89-1
0.1 mg/m3
0.3 mg/m3
——
X
2, 4, 6-Trinitrophenyl-
methylnitramine
(Tetryl)
479-45-8
1.5 mg/m3
3 mg/m3
——-
X
2, 4, 6-Trinitrotoluene (TNT)
118-96-7
0.5 mg/m3
1.5 mg/m3
——
X
Triorthocresyl phosphate
78-30-8
0.1 mg/m3
0.3 mg/m3
——
X
Triphenyl amine
603-34-9
5 mg/m3
10 mg/m3
——
——
Triphenyl phosphate
115-86-6
3 mg/m3
6 mg/m3
——
——
Tungsten (as W)
7440-33-7
——
——
——
——
Soluble compounds
——
1 mg/m3
3 mg/m3
——
——
Insoluble compounds
——
5 mg/m3
10 mg/m3
——
——
Turpentine
8006-64-2
100 ppm
150 ppm
——
——
Uranium (as U)
7440-61-1
——
——
——
——
Soluble compounds
——
0.05 mg/m3
0.15 mg/m3
——
——
Insoluble compounds
——
0.2 mg/m3
0.6 mg/m3
——
——
n-Valeraldehyde
110-62-3
50 ppm
75 ppm
——
——
Vanadium (as V2O5)
——
——
——
——
——
Respirable fraction
1314-62-1
0.05 mg/m3
0.15 mg/m3
——
——
Vegetable oil mist
——
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Vinyl acetate
108-05-1
10 ppm
20 ppm
——
——
Vinyl benzene (Styrene)
100-42-5
50 ppm
100 ppm
——
——
Vinyl bromide
593-60-2
5 ppm
10 ppm
——
——
Vinyl chloride (Chloroethylene)
(see WAC 296-62-07329)
75-01-4
1 ppm
5 ppm
——
——
Vinyl cyanide (Acrylonitrile)
(see WAC 296-62-07336)
107-13-1
2 ppm
10 ppm
——
——
Vinyl cyclohexene dioxide
106-87-6
10 ppm
20 ppm
——
X
Vinyl toluene
25013-15-4
50 ppm
75 ppm
——
——
Vinylidene chloride
(1, 1-Dichloroethylene)
75-35-4
1 ppm
3 ppm
——
——
VM & P Naphtha
8032-32-4
300 ppm
400 ppm
——
——
Warfarin
81-81-2
0.1 mg/m3
0.3 mg/m3
——
——
Welding fumes
(total particulate)
——
5 mg/m3
10 mg/m3
——
——
Wood dust
——
——
——
——
——
Nonallergenic;
(All woods except
allergenics)
——
5 mg/m3
10 mg/m3
——
——
Allergenics (e.g. cedar,
mahogany and teak)
——
2.5 mg/m3
5 mg/m3
——
——
Xylenes (ortho, meta, and
para isomers)
(Dimethylbenzene)
1330-20-7
100 ppm
150 ppm
——
——
m-Xylene alpha, alpha-diamine
1477-55-0
——
——
0.1 mg/m3
X
Xylidine
(Dimethylaminobenzene)
1300-73-8
2 ppm
4 ppm
——
X
Yttrium
7440-65-5
1 mg/m3
3 mg/m3
——
——
Zinc chloride fume
7646-85-7
1 mg/m3
2 mg/m3
——
——
Zinc chromate (as Cr)
(see WAC 296-62-08003)
Varies with compound
0.005 mg/m3
——
0.1 mg/m3
——
Zinc oxide
1314-13-2
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m
——
——
Zinc oxide fume
1314-13-2
5 mg/g3
10 mg/m3
——
——
Zinc stearate
557-05-1
——
——
——
——
Total particulate
——
10 mg/m3
20 mg/m3
——
——
Respirable fraction
——
5 mg/m3
10 mg/m3
——
——
Zirconium compounds (as Zr)
7440-67-2
5 mg/m3
10 mg/m3
——
——