There are following main methods of air pollution control which are as under:

1. The emission of contaminants to the atmosphere should be reduced by proper planning and zoning of industrial areas. It can be controlled by making proper changes in raw materials, operation and system control.

2. The concentration of the pollutants at the recipient is affected by atmospheric dispersion. Air pollution can be controlled by dispersion of the sources of air pollutants through allocation of land.

The dispersion in industrial process which can be varied to take advantage of the periods when dispersion conditions are so good that contaminants may be distributed over a large area in less time, and hence dilute the concentration of pollutants near the source

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3. Collection the contaminants is the easiest solution to air pollution problem. It is also called prevention. Before collecting, we must investigate the main sources of inputs. The engineer must consider the possibility of controlling the emissions by changing the process new change should be economical.

4. Various control devices are used for controlling different types of pollutants emitting from different sources.

Some specific measures to control air pollutants in air are as under:

(i) Unleaded petrol is used to reduce lead concentration ambient air due to vehicles,

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(ii) Use of filter.

(iii) The vehicles should be driven with electricity or Hydrogen, methane as a source of energy.

(iv) Bauxite flux should be used to in place of fluorine containing fluorspar.

(v) To reduce the emission of NO, one should adopt two-stage combustion.

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(vi) To control evaporation from fuel tank and carburetor.

(vii) Control through law.