Reduce Nox

Reduce CO

Reduce CO₂

Reduce SO₂

Diesel pressure filter

Diesel primary filter

Diesel particulate filter

Direct particulate filter

To trap the exhaust gas

to trap fresh air

to trap the leak off

to trap the fuel vapour

From fuel tank

From carburettor

From crank case blow by

From exhaust system

CO

CO₂

HC

Nox