Air is one of the important constituent in the environment that is prone to pollution.
Pollution of air refers to that part of atmosphere which is very nearest to the earth’s surface extending to a height of around 80 km.
This part is known as homosphere as it consist of homogenous mixture of various constituent.
It constitutes about 99.9% of the total atmosphere.
Air pollution can also be defined as any atmosphere condition in which the presence of certain concentration produce harmful effects on man and his local environment.
These substances include :-
(i) Gases such as oxides of CO, sulphur, oxide of N2 and hydrocarbons
(ii) Particulate matter such as smoke, fumes, dust etc.
(iii) Radioactive material and many others.