Air pollution occurs both naturally and physically causing health and environmental risks. The man made pollutants created are mostly primary this means they occur directly from a action. For example: turning on your car engine creates chemicals which are primary these are things like: http://www.science.org.au/nova/015/015key.htm We also create secondary pollutants these occur in the atmospheric level when the primary pollutants react with each other, this leads to things like ground level ozone. This contributes greatly to global warming. The following are secondary air pollutants:
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