Environmental

Carbon monoxide is a hazard in Wisconsin homes primarily associated with:

AOld lead paint
BCombustion appliances such as furnaces, fireplaces, and attached garages✓ Correct
CRadon gas from soil
DAsbestos pipe insulation

Explanation

Carbon monoxide is produced by combustion appliances (furnaces, water heaters, fireplaces) and car exhaust in attached garages; it is odorless and colorless, making detectors essential.

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