Carbon monoxide (CO) is produced by the incomplete combustion of carbon-based fuels such as natural gas, oil, wood, charcoal, gasoline, and kerosene. In the home carbon monoxide may be released by fuel-burning equipment such as portable generators, fireplaces, water heaters, space heaters, and stoves, particularly if these devices are poorly vented, malfunctioning, or allowing exhaust gases to enter indoor spaces. Another source is the exhaust of internal-combustion engines, such as those in motor vehicles, especially when vehicles are left running in attached and closed garages. Tobacco smoke is also a possible household source.
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