Carbon monoxide is a colorless, odorless and, thus, very dangerous gas emitted from combustion processes, primarily from automobiles. Other sources include stoves, engines, lanterns, grills, fireplaces, gas ranges and furnaces. The EPA’s regulation under the Clean Air Act mostly deals with carbon monoxide emitted into the ambient air, or air that is not confined.

Health and Welfare Effects

Carbon monoxide can limit the amount of oxygen delivered to the body’s organs and, at extremely high levels, cause death. Each year, carbon monoxide poisoning kills more than 400 Americans. Symptoms include headache, dizziness, weakness, upset stomach, vomiting, chest pain and confusion.

Carbon Monoxide Plans

Fortunately, after years of successful control measures, all areas within the U.S. are currently meeting 2011 carbon monoxide standards. In the past, two areas — Maricopa County and Pima County — were designated nonattainment but are now maintaining the standards. Therefore, each area has a maintenance State Implementation Plan (SIP) to protect air quality.

Maricopa County

2013 Carbon Monoxide Maintenance SIP | Download >

Pima County

2008 Carbon Monoxide Maintenance SIP | Download >