Full Name :K.MANIVANNAN
College Name :VELAMMAL ENGINNERING CLG
Subject Code :GE6351
Subject Name :EVS
Study Material Description :
IT IS USEFULL MATERIAL
Air pollution is defined as the presence of one (or) more contaminants like dust, smoke, mist and odour in the atmosphere which causes damage to plants, animals and human beings.
Composition of air: N- 78%, O2 – 21%, Argon <1%, CO2, 0637%, Tracer of O3, He, NH3.
(i) National Source: Volcanic eruption, forest fires, biological decay, radioactive materials.
(ii)Man-made: Thermal power plants, Automobile emission, forest fires , fuel burning, agricultural activities.
CLASSIFICATION OF AIR POLLUTANTS
Primary pollutions, secondary pollutions
Primary Pollutantsollutants emitted directly into the atmospheres in harmful form.
E.g.: CO, NO, SO2 etc.
Secondary Pollutants: Some of primary pollutnts react with one another (or) with basic
Components of air to form new polluants. E.g.: NO/No2 Moist HNO3/NO3 etc.
Indoor Air Pollutants: These are primary air pollutants Important indoor air pollutant is radon gas.
Sources of I.A. Pollutants: Radon gas in emitted by the building materials like bricks, concrete, tiles which are derived from soil containing radium.
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