Carbon monoxide (CO) is a colorless, nearly odorless gas that results from the incomplete oxidation of carbon during combustion.  Carbon monoxide can originate from a variety of sources, including heaters, stoves, fireplaces, generators, and automobile exhaust.  

Carbon monoxide is regulated as one of the six criteria air pollutants for which the United States Environmental Protection Agency establishes National Ambient Air Quality Standards for outdoor air pollution.  At the state level, CO alarms are required under State Building Code Council rules in most residential occupancies, and CO warning stickers must be affixed to certain motor-driven vessels.  The presence of CO alarms are one of the items that must be addressed on residential and commercial real estate seller disclosure forms.

The Department of Health must convene an interagency carbon monoxide (CO) workgroup that includes representatives from the Department of Ecology, the Washington State Patrol, and the Office of the Attorney General.  The workgroup must nominate a chair, who may nominate up to two additional participants.  The purpose of the workgroup is to produce a report on current and future state agency activities to prevent CO poisoning from sources outside of the home, increase awareness of CO among at-risk populations, collect data on CO incidents, and identify funding sources for public awareness campaigns.  The workgroup must submit a report to the Legislature by December 1, 2024, that contains recommendations on actions to reduce CO poisoning in Washington.
 
An intent section is included, and the act may be known and cited as Mary's Law.