Pollution generally classified according to environmental segment in which it is occurring. Sometimes it is also classified according to the type of pollutant by which pollution is caused. In general, there are nine different type of pollution
i) Air pollution
ii) Water pollution
iii) Soil pollution
iv) Radioactive pollution
v) Noise pollution
vi) Light pollution
vii) Visual pollution
viii) Solid waste pollution
ix) Thermal pollution
The presence of one or more contaminants in atmosphere in such quantity and for such duration so that it become injurious to human health or welfare of animals or plants life industrial modernization, increase in the population and urbanization are some of the major factors responsible for air pollution.
The industries that emit a large number of pollutants in air include thermal power plant, cement, steel, refineries, petro chemicals and mines. Air is a mixture of gases in varying amounts.
Sources of air pollutant
Air pollution results from a variety of causes, may be either natural or artificial. Dust storms in desert areas and smoke from forest fires and grass fires contribute to chemical and particulate pollution of air. This is an example of artificial air pollution.
The artificial air pollutants introduced into the environment mainly by at least five major sources
i) Automobiles (N20, CO and hydrocarbons)
ii) Electrical power plants (S02)
iii) Industrial processors (heavy metals, volatile compounds)
N20, CO, SPM, VOC, Pb SOx NOx CO C02
iv) Heating plants for homes, apartments, schools etc.
v) Transportation industry