Environmental

Carbon monoxide is a hazardous indoor air pollutant that is:

ANaturally occurring in soil and rock
BColorless, odorless, and produced by incomplete combustion of fuels✓ Correct
CThe same gas as radon
DOnly found in homes with asbestos

Explanation

Carbon monoxide is a colorless, odorless gas produced by incomplete combustion from furnaces, water heaters, gas appliances, and vehicles — it is a leading cause of accidental poisoning.

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