Carbon monoxide (CO) is produced due to the incomplete oxidation of carbon during the process of combustion when any fuel is burned. Diesel, biodiesel, gasoline, propane, natural gas, oil, wood and coal all produce carbon monoxide when burned. In the United States, 60% of CO emissions are from vehicle exhaust. In congested urban areas, up to 95% of CO emissions can be attributed to on-road and off-road vehicles. Other sources of CO emissions are industrial boilers and incinerators, unflued or defective gas heaters and heating appliances.

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