8th Class Science Notes- Pollution of Air and Water

Air pollution is basically the occurrence of the chemical in the air in quantities which are harmful to human health and the environment.

The common air pollutants and their main sources:-

Particulate Matter: – It is made up of tiny particles suspended in air. Major particulate matter sources are volcanic eruption, dust storm, burning of fossil fuel in thermal plants and forest fire. They are also present in exhaust fumes of automobiles and power plants as soot, fly ash and lead particles.
Chlorofluorocarbons (CFCs) – They are commonly used as coolants in refrigerators, air conditioners and as propellants in aerosol spray cans. They are also used in home insulation, plastic foam, and throwaway metallic cans.
Burning of fossil fuels- They are coal and petroleum in thermal power plants and automobile releases oxides of sulphur and nitrogen into the air.
Burning of carbon– Carbon-rich fuels such as firewood, coal, and petroleum releases carbon dioxide and carbon monoxide into the atmosphere.

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