Carbon monoxide (CO) is a highly toxic, colorless, odorless, flammable gas formed by the incomplete conversion of carbon or carbon-containing fuels to carbon dioxide. It is present in the exhaust gases of internal-combustion engines and in emissions from furnaces, boilers, generators, and other fuel-burning appliances. Carbon monoxide may be released in greater amounts when such sources are faulty, poorly installed, or used in enclosed or poorly ventilated spaces.
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