CO
This pollutant is produced by the incomplete (non-ideal) burning of fuels such as natural gas, coal, wood, gasoline, etc. Common sources of carbon monoxide are unvented gas space heaters, gas stoves, fireplaces, generators, gasoline-powered equipment, including automobiles. In particular, dangerous sources can be old or poorly functioning combustion devices. In high enough quantities, this pollutant can pose immediate threats to human health and life.
Learn more about carbon monoxide
Sources:
Reference Levels
CO Molecule
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.5 - 5 ppm: typical range in homes with no gas stoves
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5 - 15 ppm: typical range in homes with gas stoves
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1-70 ppm: Prolonged exposure to this range typically does not cause symptoms in healthy people
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> 70 ppm: Symptoms of CO poisoning will begin to appear in healthy people
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> 150 - 200 ppm: Dangerous levels of CO exposure