Air pollution, by definition, is made up of foreign particles present in the air that do not belong there. Several dangerous pollutants from cars are: hydrocarbons from car exhaust (a toxic compound of hydrogen and carbon), nitrogen oxides, particulate matter, when the carbon in the fuel does not burn These pollutants have been linked to contributing to heart disease, potential premature babies, birth defects, eye irritation and cancer. Scientists believe that air pollutants may also lead to global warming (Brinson, n.d., p3). According to Brinson, “although the United States Environmental Protection Agency (EPA) Cars are declared “mobile sources” of pollution, but they are not the only ones responsible. Ships and boats, trains and even snow blowers pollute the air According to the EPA, motor vehicles are collectively responsible for 75% of carbon monoxide pollution in the United States. Fund (EDF) estimates that road vehicles are responsible for one-third of the air pollution that produces smog in the United States, and that transportation is responsible for 27 percent of greenhouse gas emissions. the world's automobiles, but they contribute about half of global car emissions. The United States began imposing strict regulations on automobiles.