Environmental

Carbon monoxide (CO) detectors are required in Rhode Island residential properties because CO is:

AA visible brownish gas from vehicle exhaust
BA colorless, odorless poisonous gas that can be fatal at high concentrations✓ Correct
CA type of mold that grows near gas appliances
DA radon byproduct found in basements

Explanation

Carbon monoxide is a colorless, odorless gas produced by incomplete combustion of fossil fuels. High concentrations can cause rapid loss of consciousness and death.

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