Air pollution:
Air might tend to be harmful to human, animals and plants. Or else, air pollution can be stated as any undesirable change in physical, chemical and biological characteristics of air which might be injurious to living organisms and living circumstances.
Excessive discharge of air pollutants in the atmosphere by human actions disturb the dynamic equilibrium in the atmosphere and thus affect man and his atmosphere.Sources of air pollution:
The most general gaseous air pollutants are sulphur-dioxide, carbon monoxide, oxides of nitrogen, hydrogen sulphide, chlorine, carbon-dioxide, hydrocarbon & oxidants. The other pollutants in the air are dusts, heavy metals such as cadmium and chromium. The main sources for carbon-dioxide pollutant are unfinished combustion of fuels, automobile exhausts, blast furnaces, jet engine emissions, and tobacco smoking. The main sources for sulphur dioxide pollutant are combustion of coal, oil refining industries, petroleum industries, power houses and sulphuric acid plants and metallurgical operations. The main sources for oxides of nitrogen are in adding up to automobile exhausts, explosives industry, boilers, and production of nitric acid industry and combustion of wood and decline.
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