Environmental

In Illinois, carbon monoxide (CO) detectors are required in:

AOnly commercial buildings
BResidential dwellings with fuel-burning appliances or attached garages under the Carbon Monoxide Alarm Detector Act✓ Correct
COnly buildings near highways where exhaust fumes are a concern
DCO detectors are recommended but not legally required in Illinois

Explanation

Illinois's Carbon Monoxide Alarm Detector Act (430 ILCS 135) requires carbon monoxide alarms in residential dwellings (including apartments and rental units) that have fuel-burning appliances (gas furnaces, stoves, water heaters) or attached garages. Landlords are responsible for installing CO detectors in rental properties. CO is odorless and colorless, making detectors essential for preventing carbon monoxide poisoning, which claims lives in Illinois each year.

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