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Carbon monoxide=Produce by incomplete combustion of fuels
Sulfur dioxide =IT is produce by volcanoes,industries,acid rain
 nitrogen oxide=It is produce by very high combustion
 VOC's =Methane and non methane gases
CFC's=Ultra Violet Rays 
 Particulates=Forest Fires
Toxic things=Polythene Bags
 Emmision= from factories
Ammonia=Agricultural Process
Peroxyacetyl nitrate (PAN)= NOx and VOCs. 
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