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How do industrial units pollute air in India? Explain any four points.

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Industries cause different types of pollution—land, air and water. 

  • Air pollution is caused by the release of undesirable gases and smoke like sulphur dioxide, carbon monoxide. 
  • Air-borne particulate materials like dust, sprays, mist and smoke cause air pollution. 
  • Smoke is emitted from chemical and paper mills, brick kilns, refineries, smelting plants. 
  • Burning of fossil fuels in big and small factories which do not follow pollution norms. Toxic gas leaks can be very hazardous with long-term effects. 
  • Air pollution adversely affects human health, plants and animals. In human beings, air pollution can cause respiratory problems. Smog in the atmosphere cause respiratory problems.

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