Name the different types of pollution which lead to the degradation of the environment.
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Air pollution: Air pollution is caused mainly due to the release of following materials in the atmosphere.
Undesirable gases like sulphur dioxide and carbon monoxide.
Air borne particulate matter containing smoke, dust and spray mist.
Toxic gases by burning fossil fuels in the industries.
Water pollution:
Caused by organic and inorganic industrial wastes discharged into the rivers.
Liquid wastes produced by chemical and textile industry, tanneries, petroleum refineries, electroplating industries and metallic pesticides etc.
Solid wastes like fly ash, phospo-gypsum and slags produced by iron and steel industries.
Land pollution: All the pollutants that cause water pollution, along with wastes from nuclear power plants are responsible for land pollution. Water and land pollution are closely related. All the liquid and solid affluent if not going into the rivers goes into the soil and degrade the land areas.
Noise pollution: All the unwanted sound caused due to industrial and construction activities, machinery, generators and drilling activities create irritants and are a source of stress.
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Why is aluminium smelting industry close to power sector? Describe other important factors for location of aluminium smelting. Why is this industry gaining importance? Give reasons.