European Union in its effort to reduce the environmental pollution caused by heavy vehicles established certain rules about the vehicle's emissions. All vehicle manufacturers already meet those requirements. Starting October 2006 the legislation - known as euro 4 - permits NOx emissions up to 3.5 gr/kWh.

Next directice -known as euro 5 - that the vehicle manufacturers should comply with the latest in October 2009 regulates emissions NOx at 2.0 grKh.

In the table below you can see the emission standards for both euro 4 and euro 5.

EURO Emission standard (g/kWh)

	EURO 4	EURO 5
NOx	3.50	2.00
Carbon monoxide	1.50	1.50
Hydrocarbons	0.46	0.46
Carbon particles	0.02	0.02