There are a number of industries which are source of toxin transport to the environment. Petroleum refineries are the major source of gaseous pollutants.There are many food and fertiliser industries which emit gaseous pollutants. There are also chemical manufacturing industries which emit acid vapours in air.
There are a number of thermal power stations and super thermal power stations in the country. The chief pollutants are fly ash, oxides of sulphur, nitrogen oxides, carbon monooxide, hydrocarbons, aldehydes and particulate matter. The toxic vehicular exhausts are a source of considerable air pollution.