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(iv) At a concentration above 150 g/100m, cotton dust in ginning process produces pneumoconiosis or lung fibrosis called byssinosis.
Essay on Air Pollution: Causes, Effects and Control of Air Pollution!
The World Health Organization defines air pollution as “the presence of materials in the air in such concentration which are harmful to man and his environment.” In fact air pollution is the occurrence or addition of foreign particles, gases and other pollutants into the air which have an adverse effect on human beings, animals, vegetation, buildings, etc.
Due to excessive combustion activity, the content of C0 has been steadily rising.
As carbon dioxide accumulates in the atmosphere it absorbs more and more of the reflected infrared radiation.
Human activity forms nitrogen oxides in combustion process of industries, automobiles, incinerators and nitrogen fertilizers.
Nitrogen oxides act on unsaturated hydrocarbons to form peroxy-acyl nitrates or PAN. They cause eye irritation, respiratory troubles, blood congestion and dilation of arteries.
(iii) Particulate matter suspended in air, scatters and partly absorbs light.
In industrial and urban areas, sunlight is reduced to 1/3 in summer and 2/3 in winter.
The major cause of pollution in the urban areas is automobiles which inefficiently burn petroleum, releases 75% of noise and 80% of air pollutants.
Concentration of industries in one area is another major cause of air pollution.