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What produces this dangerous gas?

Carbon monoxide is the nation's leading indoor air pollution problem. It is produced when fuels containing carbon are burned in areas where there is too little oxygen or as a result of burning fuels at very high temperatures. Death and injury can occur when CO escapes from sources such as furnaces, space heaters, stoves, ovens and automobiles where there is improper ventilation. Learn more about the sources of CO in your home and the precautions you can take to avoid exposure to carbon monoxide.