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Environmental Issues
Air pollution. Release of harmful materials into the air that leads to the degradation of air quality and atmosphere condition. Air pollutants include gaseous materials, suspended particles and radioactive substances.
(a) The gaseous pollutants of air come from automobiles and industries. These include CO, CO2, NO, NO2, SO2, SO3, hydrocarbons, fluorides and photochemical oxidants, such as peroxyacyl nitrate (PAN), ozone (O3), and aldehydes. .
(b) The particulate contaminants of air also come from industries and automobiles. These include fly-ash, soot, metal dust, cotton fibres, asbestos, fibres, lead, aerosols (chlorofluorocarbons or CFCs), polychlorinated biphenyls (PCBg), tobacco smoke, smog, pollen, spores, cysts and bacteria.
(c) Radioactive substances are released by nuclear explosions and war explosives.
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1. Increase in concentration of soluble salts in the soil is called.........
2. Aforestation can check the advancement of......... .
3. DDT is a serious pollutant as it is a.........pollutant and undergoes......... .
4 .........plant has become a troublesome weed in agricultural fields.
5 .........are major aerosol pollutant present in jet aircraft emission.
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