Air pollution is woven throughout the fabric of our modern
life. Pollution problems began with the growth of cities and population and
their related water, industrial and disposal needs. With the increase of
urbanization man began to intrude on the beautiful, balanced mechanism of the
atmosphere.
Nitrogen oxides include chiefly NO, NO2 and HNO3 mostly
released by automobiles, power-plants and chemical from industries. The
industries manufacturing HNO3 and other chemicals and the automobile exhausts
are the chief source of the Nitric Oxide (NO) gas to the environment.
At high temperature, combustion of gasoline produces this
gas. A number of chemical reactions serially convert a large amount of NO to more toxic NO2
in the atmosphere.
NO is responsible for the several photochemical reactions in the atmosphere, particularly
in the formation of several secondary pollutants like PAN, O3, Carbonyl
compounds, etc.,
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