What are the various activity by which human beings that make air impure?
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By releasing CO2 during respiration..
Green house effect which cause global warming..and release of poisonous gas by factory..
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Burning of plastics, wood , cowdung , fossil fuels, petrol used in vehicles , harmful gas releasing factories , industries ,without proper measures given by government etc... give off CO2 and other harmful gasaes like oxsides and nitrides of sulphur
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