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Explain the sources of air pollution?
Air consists of a mixture of gases -nitrogen (78%) oxygen (21 %) and other gases like CO2 argon ,methane ,helium ,ozone and water vapour are present in very small amounts

Main causes of air pollution
1.Excessive burning of fossil fuels like coal,kerosene ,petrol and diesel.
2.Smoke from vehicles .
3. Smoke from factories and thermal power stations.
4.Deforestation .
5.Usage of chlorofluorocarbon in refrigerators and spray cans .
 


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