Control measures:

(i) destroying the pollutants by thermal or catalytic combustion

(ii) conversion of the pollutants to a less toxic form

(iii) collection of the pollutant

♤ Different types of air pollutants can be eliminated / minimised by following methods:

a) Control of particulate matter: Two types of devices -arresters and scrubbers are used to remove particulate pollutants from air. These are arresters and scrubbers.

i. Arresters: These are used to separate particulate matters from contaminated air.

ii. Scrubbers: These are used to clean air for both dusts and gases by passing it through a dry or wet packing material.

b) Control of Gaseous Pollutants:

The gaseous pollutants can be controlled through the techniques of Combustion, absorption and adsorption.

c) Control of Automobile Exhaust

i. use of efficient engines (e.g. multipoint fuel injection engine).

ii. Catalytic converter filters in the vehicles can convert nitrogen oxide to nitrogen and reduce the potential hazards of NOx.

iii. use of good quality automobile fuels

iv. use of lead free petrol.

v. Use of compressed natural gas (CNG).