Environmental

Carbon monoxide (CO) is a health hazard in homes because:

AIt has a strong odor that indicates gas leaks
BIt is colorless, odorless, and can cause illness or death from combustion appliances✓ Correct
CIt is produced only by industrial factories
DIt only affects homes built before 1978

Explanation

CO is a colorless, odorless gas produced by combustion appliances (furnaces, water heaters, fireplaces). It can cause poisoning and death, making CO detectors essential.

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