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प्रश्न
Describe the major source of air pollution.
उत्तर
Combustion of coal, petrol, and diesel, industrial processes, solid waste disposal, sewage disposal, etc. are the major sources of air pollution because they add oxides of sulfur, oxides of nitrogen, carbon monoxide, hydrocarbons, ammonia, lead aldehydes, asbestos, and helium in the atmosphere.
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