Environmental

Carbon monoxide (CO) detectors are required in Washington residential dwellings because:

ACO causes property damage
BCO is an odorless, colorless toxic gas that can cause death; state law requires CO detectors in most residential buildings✓ Correct
CCO is required by federal OSHA standards in homes
DCO detectors are required only in homes with gas appliances

Explanation

Washington state law (RCW 19.27.

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