Air pollution from cars are believed to cause cancer and provide to such problems as asthma, heart disease, birth defects and eye irritation. However, emissions from cars increase the levels of carbon dioxide (CO2) and other greenhouse gases in the atmosphere. At normal levels, greenhouse gases keep some of the sun’s heat in the atmosphere and help warm the Earth. So, we should taking public transportation for reduce the amount of cars on the road. Reducing use of oil for improve the quality of air better. Causing gases that cause global warming.