Air pollution is caused by release of particulates, biological molecules or harmful gases into atmosphere, which causes death to humans and damage to living organisms like food crops. Water pollution occurs by the contamination of water bodies like lakes, rivers, oceans. Therefore environment degradation occurs which causes the pollutants to discharge directly or indirectly into water bodies.
Discussions about the effects of air pollution have focused mainly on human health but attention is being directed to environmental quality and amenity as well. Air pollutants are found as gases or particles, and on a restricted scale they can be trapped inside buildings as indoor air pollutants. Urban air pollution has long been an important concern for civic administrators, but increasingly, air pollution has become an international problem.
The most characteristic sources of air pollution have always been combustion processes. Here the most obvious pollutant is smoke. However, the widespread use of fossil fuels has made sulfur and nitrogen oxides pollutants of great concern. With increasing use of petroleum-based fuels, a range of organic compounds have become widespread in the atmosphere.
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