Diesel engine
Petrol engine
LPG engine
CNG engine
Banian cloth
Cotton roll
Paper filter
Activated charcoal
Exhaust gas recirculation
Positive crank case ventilation
Catalytic convention
Selective catalytic reduction
Reduce CO2
Reduce PM
Reduce Nox
Reduce HC
Due to complete combustion
Due to incomplete combustion
Due to excess air supplied
Due to atmospheric mixture