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This could cause an increase in temperature referred to as the green house effect.Melting polar ice caps and glaciers could cause sea levels to rise, flooding most of the major population centres and fertile lands.Phosgene (COCl) is a poisonous and suffocating volatile liquid which is employed in dye industry and synthesis of organic compounds.
Air pollutants are broadly classified into particulate and gaseous.
The particulate substances include solid and liquid particles.
Burning of plastics produces polychlorinated biphenyls (PCBs).
The latter are persistent and pass into the food chain.
The different air pollutants and their effects are as follows: It is of two types—settleable and suspended.
The settleable dusts have a particle longer than 10 (am.
Carbon monoxide combines with haemoglobin of blood and impairs its oxygen carrying capacity. Sulphur dioxide, above 1 ppm, affects human beings.
At higher concentration, carbon monoxide proves lethal. It is produced in large quantity during smelting of metallic ores and burning of petroleum and coal in industries, thermal plants, home and motor vehicles. It causes irritation to eyes and injury to respiratory tract.
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.