Environmental

In Alaska, 'carbon monoxide' is a household safety concern in real estate primarily due to:

AOld lead water pipes releasing CO into drinking water
BImproperly vented heating systems, generators, and attached garages producing the odorless, colorless gas✓ Correct
CFrozen permafrost releasing CO when it thaws
DWildfire smoke entering homes through ventilation systems

Explanation

Carbon monoxide is an odorless, colorless, toxic gas produced by incomplete combustion. In Alaska, where heating systems run heavily during cold winters and generators are commonly used, improperly vented furnaces, boilers, wood stoves, and generators are significant sources of CO risk.

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