All vehicles registered from 1 October 2006 have to meet Euro 4 legislation. Euro 5 comes into force on 1 October 2009.
The new Euro norms for exhaust reduction impose tough demands on all vehicle manufacturers. The difference in exhaust emissions requirements between a Euro 3 and a Euro 4 engine is considerable. Emissions of nitrogen oxides (NOx) have to be cut from 5 to 3.5 g/kWh, a reduction of 30%. Particulate (PM) emissions must drop from 0.1 to 0.02 g/kWh. This corresponds to a reduction of no less than 80%.
The diagram to the right shows the dramatic decrease in NOx and PM necessary to meet the Euro 4 and especially Euro 5 legislations: