There are many different chemical substance that contribute to air pollution, these chemicals come from a variety of sources. Among the many types of air pollutants are nitrogen oxides,carbon monoxides, and organic compounds that can evaporate and enter the atmosphere. Air pollutants have sources that are both natural and human. Now humans contribute substantially more to the air pollution problem. Usually, natural air pollution does not occur in a bandance in particular locations. The pollution is spread around throughout the world. And as a result, poses little threat to the health of people and ecosystem. Though some pollution comes from these natural sources, most pollution is the result of human activity. The biggest causes are the operation of fossil feul-burning power plants and automobiles that combust fuel. Some cities suffer severely because of heavy industrial use of chemicals that cause air pollution. Keep your enviroment to make your breath pure!