Air pollution refers to contaminants in the air are higher than normal for the time. Long enough to cause harm to humans, animals, crops or other property may occur naturally, such as dust storms. Volcanic eruptions, earthquakes, forest fires, natural gas, air pollution occurs. By nature is very little danger to humans. The origin is far and quantities into the environment with little human and animal. Cases are caused by human activities, including pollution from the exhaust of the car from the factory of production of agricultural activity from the evaporation of gas species. Caused by garbage and waste and so on.
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