Air pollution
Greenhouse Gas
Sulfur oxides - especially sulfur dioxide,Sulfur oxide is produced by volcanoes and in various industrial processes. Since coal and petroleum often contain sulfur compounds, their combustion generates sulfur dioxide. Further oxidation of Sulfur oxide,and thus acid rain. This is one of the causes for concern over the environmental impact of the use of these fuels as power sources.

Nitrogen oxides - especially nitrogen dioxide are emitted from high temperature combustion. Can be seen as the brown haze dome above or plume downwind of cities. It is one of the several nitrogen oxides. This reddish-brown toxic gas has a characteristic sharp, biting odor. Nitrogen oxide is one of the most prominent air pollutants.

Carbon monoxide - is a colourless, odourless, non-irritating but very poisonous gas. It is a product by incomplete combustion of fuel such as natural gas, coal or wood. Vehicular exhaust is a major source of carbon monoxide.

Carbon dioxide - a greenhouse gas emitted from combustion but is also a gas vital to living organisms. It is a natural gas in the atmosphere.

Toxic Metals
Chlorofluorocarbons - harmful to the ozone layer emitted from products currently banned from use.
Ammonia - emitted from agricultural processes. . It is normally encountered as a gas with a characteristic pungent odor. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to foodstuffs and fertilizers. Ammonia, either directly or indirectly, is also a building block for the synthesis of many pharmaceuticals. Although in wide use, ammonia is both caustic and hazardous.
Radioactive pollutants - produced by nuclear explosions, war explosives, and natural processes such as the radioactive decay of radon.
Causes of Air pollution
Volcano eruption,Forest fire and Burning of land to build farm
Url:http://en.wikipedia.org/wiki/Air_pollution

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