4. Carbon Monoxide Most of our serious air pollution is produced either directly or indirectly by the combustion of fuels Incomplete combustion of carbon leads to the formation of carbon monoxide: 2C+O2→2CO A prime source of Co is the gasoline-fueled, spark-ignited internal combustion engine, where the burning of gasoline takes place at high pressure and temperature but not in an over-abundance of oxygen Motor vehicles account for more than 50% of the carbon monoxides In Los angeles County, there are over 3 million cars and more than 8000 tons of co emitted every day from internal combustion engines( about 5 pounds per vehicle per day)4. Carbon Monoxide Most of our serious air pollution is produced either directly or indirectly by the combustion of fuels. Incomplete combustion of carbon leads to the formation of carbon monoxide: 2C + O2 → 2CO A prime source of CO is the gasoline-fueled, spark-ignited internal combustion engine, where the burning of gasoline takes place at high pressure and temperature but not in an over-abundance of oxygen. Motor vehicles account for more than 50% of the carbon monoxides. In Los Angeles County, there are over 3 million cars and more than 8000 tons of CO emitted every day from internal combustion engines ( about 5 pounds per vehicle per day)