Environmental

The primary concern with carbon monoxide in residential properties is that it:

ACauses structural damage to wood framing

BIs a colorless, odorless, toxic gas produced by incomplete combustion that is undetectable without a detector✓ Correct

CContaminates drinking water in older homes

DIs only a concern in industrial properties

Explanation

Carbon monoxide (CO) is a colorless, odorless, and tasteless toxic gas produced by incomplete combustion from furnaces, fireplaces, gas appliances, and generators. Because it cannot be detected without a detector, Illinois requires CO detectors in most residences.

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