Air pollution mean Air condition with adulterated substances in quantities higher than the normal level for a period long enough to cause harm to humans. Animals, plants or other property may occur naturally, such as dust from wind storm. Volcanic earthquake bomb forest fires Natural gas bad weather happens. By nature, is harmful to humans, very little, because the source is far, and the quantity that enters the environment of humans and animals have less. If it is caused by human actions such as pollution from the exhaust of cars from factories from the movement from the agricultural activity from some types of gas evaporation caused by waste and scrap, etc.