I have told you about many ways that air pollution can be caused by man and society. But humans are not the only cause of air pollution. There are also many natural causes of air pollution such as, vegitation, pollon, biological decay, forest fires, volcanes oceans and even lightning strikes.For example;
*sulphur dioxide include release from volcanoes, biological decay and forest fires
*nitrogen oxides include volcanoes, oceans, biological decay and lightning strikes
*particulate matter include volcanoes and dust storms*Volatile organic compounds (VOCs) are naturally produced by plants and trees. some VOC's including Isoprene are believed to be significant trigger for asthma.
*Plant, grass and trees are also a source of pollen, which can act as triggers in some asthmatics
(read more on this website http://www.ace.mmu.ac.uk/eae/air_quality/older/Natural_Air_Pollution.html )
Come back to learn more.- cn

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