| http://www.w3.org/ns/prov#value | - nausea, fatigue, confusion and dizziness that disappear when a person breathes fresh air.Unusually high indoor humidity with persistent heavy condensation on walls and windows and soot or water collecting near a burner or ventStuffy or stale indoor air.Carbon monoxide is created when fuels such as gasoline, wood, coal, natural gas, propane, oil or methane don???t burn completely.
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