Air pollution refers to the presence of foriegn substances that harm plants, animals, and property.
Air pollution is a problem in countries where urban and population growth have been accompanied by industrial development and the use of the automoble. Some pollutants of the air comes from little things like aerosols that we take for granted. Dust, mists and gaseous pollutants are natural sources of air pollution. Smoke and fumes are a growing problem. They come from industries and automobles.