Answer:
Industries cause four different kinds of pollution, namely, air, water, thermal and noise pollution.
Air pollution is caused
(i) by the presence of undesirable gases beyond certain levels like sulphur dioxide and carbon monoxide.
(ii) by the emission of smoke from chemicals paper industries, burning of fossil fuels,
(iii) by the leakage of poisonous gases and hazardous chemicals,
Water pollution is caused by discharge of industrial effluents into rivers. Industries like paper, Chemical, textile and dyeing, tanneries, petroleum, refining, detergents, soaps that let out chemical and solid wastes pollute the water bodies.
Thermal pollution is caused by discharge of hot water from factories into rivers and ponds, affect the aquatic life. Wastes from nuclear power plants, chemicals cause land and soil pollution. Percolation of rainwater pollutes the groundwater also.
Noise pollution Undesirable noise produced from industries like pneumatic drills, construction activities cause impairment of hearsing, blood pressure and other health problems.
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