Environmental

Carbon monoxide (CO) detectors are required in New Hampshire residential properties because:

ACO is a visible gas that alerts occupants naturally
BCO is an odorless, colorless gas produced by combustion appliances that can be lethal✓ Correct
CCO only affects commercial buildings
DCO detectors are required only in homes with wood stoves

Explanation

Carbon monoxide is odorless, colorless, and potentially lethal. NH law requires CO detectors in residential properties with fossil fuel appliances or attached garages to protect occupants from accidental poisoning.

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