2.9 Tropospheric pollution or Air pollution

2.1 Pollutant
2.2 Contaminant
2.3 Source
2.4 Sink
2.5 Receptor
2.6 Threshold limit value (TLV)
2.7 Flow sheet of Environmental pollution process
2.8 Atmospheric Pollution
2.9 Tropospheric pollution or Air pollution

3.1 Primary pollutants
3.2 Particulate Matter
3.3 Inorganic gases
3.4 Secondary Pollutants
3.5 Major air pollutants

6.1 Role of Ozone Layer
6.2 Depletion of Ozone Layer

7.1 Chemistry of acid rain
7.2 Harmful effect of acid rain

8.1 Green house effect around the earth
8.2 Advantages of green house effect
8.3 Harmful effects of green house effect
8.4 Water Pollution

10.1 Control of water pollution
10.2 Land Pollution
10.3 Pesticides
10.4 Control of soil pollution
10.5 Green Chemistry: A new route to protection of environment

Air is one of the important constituent of the environment that is prone to pollution. Pollution of air refers to that part of atmosphere which is nearest to the earth’s surface extending to a height of about 80 km. This part is known as homosphere because it consist of homogenous mixture of various constituent. It constitutes about 99.9% of total atmosphere.

Air pollution may be defined as any atmosphere condition in which the presence of certain concentration produce harmful effects on man and his environment. These substances include:

(i) Gases such as oxides of sulphur, $CO,$ oxide of ${N_2}$ and hydrocarbons

(ii) Particulate matter such as dust, smoke, fumes etc.

(iii) Radioactive material & many others.