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(a) Air pollution: This kind of pollution is caused by the emission of harmful gases into the atmosphere. Smoke and chemicals emitted by factories and vehicles degrade the air quality and causes air pollution.
(b) Water pollution: Discharge of industrial and household wastes into rivers, streams or lakes causes degradation of the water quality. Over time, the increase in water pollution often results in the deaths of several animals and poses serious threats to human beings.
(c) Land pollution: This is caused due to the dumping of toxic material and wastes on land, which in turn damages the quality of land, making it unfit and unproductive for agriculture and crop plantation.