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Dirty cars, dirty airIn 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.This air pollution carries significant risks for human health and the environment. Through clean vehicle and fuel technologies, we can significantly reduce air pollution from our cars and trucks, while cutting projected U.S. oil use in half within the next 20 years.The ingredients of air pollutionCars and trucks produce air pollution throughout their life, including pollution emitted during vehicle operation, refueling, manufacturing, and disposal. Additional emissions are associated with the refining and distribution of vehicle fuel.Air pollution from cars and trucks is split into primary and secondary pollution. Primary pollution is emitted directly into the atmosphere; secondary pollution results from chemical reactions between pollutants in the atmosphere. The following are the major pollutants from motor vehicles:
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