Environmental

A NH property inspection reveals a malfunctioning oil furnace with suspected carbon monoxide (CO) leaks. This is a serious concern because:

ACO is visible and smells like exhaust, making it easy to detect
BCO is a colorless, odorless, toxic gas that can cause illness or death without detection✓ Correct
CCO only affects properties in urban areas
DNH building code allows CO levels up to 50 ppm in residential settings

Explanation

Carbon monoxide (CO) is a colorless, odorless, highly toxic gas produced by incomplete combustion in oil, gas, and wood-burning appliances. NH requires CO detectors in residential dwellings.

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