Anything that alters the normal composition of our natural atmospheric air will leads to air pollution. The natural composition of our unpolluted atmospheric air is 78% Nitrogen, 21% oxygen, 0.9% Argon, 0.04% Carbon dioxide and remaining traces of other gases . In general air is polluted by pollutants like dust particles or particulate matter from industrial emissions, pollen’s, burning of wood and coal, power plants, fumes, vapors or odorous molecules from manufacturing industries, paints, sewage plants etc..
Causes of Air pollution.
Air cannot be 100% pure without any of this harmful particles but there is a minimum allowable limit for presence of each harmful pollutants as guided by environmental norms and standards, above which it will adversely affect our health and leads to premature deaths. In simple anything overdosed, even good or bad will always leads to problem. There are many causes for air pollution. Here i am curating top ten most important factors that causes more than 99% of air pollution.
1. Vehicular exhaust
2.Thermal power plants (Burning Coals and fossil fuels)
4. Manufacturing Plants
5.Fertilizers and Pesticides
6.Indoor Air Pollution.
7. Natural sources like forest fire, Volcanoes and tornados
8. Mining & Quarrying
9. Cigarette smoking
10. Wood firing at households for Cooking.
Other notables are
Air conditioners and refrigerators emitting Chlorofluorocarbons (CFCs)
Untreated Municipal and sewage wastes