Sources of pollution in automobile and The ways for controlling emission control

Sources of pollution in automobile:

There are four source of pollution in automobile

a.      Without controls carburetor. 

b.      Fuel tank emit fuel vapor. 

c.      Crankcase emit blow by emission.

d.      Tail pipe emit exhaust gases contain pollutants.

The ways for controlling emission control:

There are four ways for emission controlling and they are

i.                    PCV (Positive crankcase  ventilation)

ii.                 Evaporative emission control

iii.               Exhaust after treatment

iv.               Catalytic converter