Air pollution refers to weather conditions with contaminants in higher than normal levels for a long time cause harm to humans, animal, plant or various assets and may occur spontaneously such as dust particles from storm winds, volcano eruption, earthquake,
forest fires, natural gas and air pollution occurs. By nature is very little danger to humans.
Cases caused by human actions include pollution from the exhaust pipe of car, production process of industrial plants, agricultural activity, evaporation of some kind gas which caused solid waste and waste, etc.