What are the sources of carbon monoxide?

Carbon monoxide is found in combustion fumes produced by vehicles, cigarettes, and household appliances. Other sources also include small gasoline engines, gas water heaters, gas ranges, stoves, heating systems, spray paint, solvents, degreasers, paint removers, as well as burning charcoal and wood.

Prolonged stay in poorly ventilated enclosed or semi-enclosed areas where any carbon monoxide-producing sources are being used, CO poisoning can occur.