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1. One of the main causes of air pollution is manufacturing.
2. This source of 
pollution spews particulate matter and chemicals into the atmosphere.
3. The exhaust from a factory includes, sulphur oxides, nitrogen oxides, carbon monoxide and dioxide, as well as volatile organic compounds and particulates.
4. Dangerous gas evolved from vehicles.
5. Factories and Industries.
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Air pollution is caused due to release of toxic gases in the air. Carbon monoxide, carbon dioxide, sulphur dioxide are the gases which cause air pollution. Their is release of harmful gases into the atmosphere due to vehicles and factories.