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Air pollution is mainly caused by industries and vehicles running on petrol and diesel. The fuel such as diesel or gasoline in vehicles or coal in industries is burned to form oxides of carbon, nitrogen and sulfur and emit small particulate matters. These oxides and especially oxides of nitrogen and carbon are responsible for global warming. Particulate matters in an air and mainly those who are lower than 2.5 microns are carcinogenic and affect human health badly. Cleaner fuel and better technology can minimize the particulate matter, which will help in reducing air pollution.