(1) Standard for ozone. The three-year average of the annual fourth highest daily maximum eight-hour average concentration of ozone in the ambient air must not exceed 0.070 ppmv.
(2) Measurement method. The levels of ozone in the ambient air must be measured by:
(a) A FRM based on 40 C.F.R. Part 50, Appendix D and designated according to 40 C.F.R. Part 53; or
(b) A FEM designated according to 40 C.F.R. Part 53.
(3) Interpretation method. The interpretation method found in 40 C.F.R. Part 50, Appendix U must be followed.
[Statutory Authority: RCW
70.94.152,
70.94.331,
70.94.860. WSR 16-12-099 (Order 16-01), § 173-476-150, filed 5/31/16, effective 7/1/16. Statutory Authority: Chapter
70.94 RCW. WSR 13-24-010 (Order 12-05), § 173-476-150, filed 11/21/13, effective 12/22/13.]