Carbon monoxide is produced primarily from transportation, fuel burning for space heating, and electrical generation. Industrial processes, as well as wood, agricultural, and refuse burning, also contribute to emissions of carbon monoxide. Carbon monoxide can exert toxic effects on humans by limiting oxygen distribution to organs and tissues. People with impaired circulatory systems are more vulnerable at lower levels than healthy individuals. Exposure to carbon monoxide can impair visual perception, work capacity, manual dexterity, learning ability, and the performance of complex tasks.

Statewide annual carbon monoxide levels over the last decade generally have remained at one-third of the standard. A peak in the statewide average level during 1994 was due to two exceedances of the standard at one air monitoring site in Detroit. No exceedances of either 1-hour or 8-hour carbon monoxide standards have occurred in the last ten years. All areas in Michigan have been in attainment with the 1-hour and 8‑hour standards since August 30, 1999.

Other Resources:

• Carbon Monoxide Attainment Map
• Carbon Monoxide Monitoring Network
• Carbon Monoxide Real-Time Data

EPA Websites:

• CO - How Carbon Monoxide Affects the Way We Live and Breathe
• Automobiles and Carbon Monoxide - Carbon monoxide (CO) is a colorless, odorless, poisonous gas.
• Sources of Information on Indoor Air Quality: Carbon Monoxide (CO) - This page provides information about carbon monoxide.
• National Air Quality Status and Trends: Carbon Monoxide (CO)-   Carbon monoxide is a colorless, odorless, poisonous gas formed when carbon in fuels is not burned completely.
• Protect Your Family and Yourself from Carbon Monoxide Poisoning- You can't see or smell carbon monoxide, but at high levels it can kill a person in minutes.
• What You Should Know About Combustion Appliances and Indoor Air Pollution-   Combustion appliances are those which burn fuels for warmth, cooking, or decorative purposes.