Environmental

Carbon monoxide (CO) is produced in homes primarily by:

ALead paint deterioration
BIncomplete combustion from gas appliances, furnaces, and fireplaces✓ Correct
CRadon decay products
DFormaldehyde off-gassing from new materials

Explanation

Carbon monoxide is a colorless, odorless gas produced by incomplete combustion of fuels. Common sources in homes include gas furnaces, water heaters, fireplaces, wood stoves, and attached garages with idling vehicles. CO detectors are required in many Kentucky homes.

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