EURO 6

EURO 6 is an European standard about the reduction of pollutant emissions of light passenger and commercial vehicles in force from Sept. 2014 for new models and from Sept. 2015 for any vehicle.
EURO 6 concerns mainly the emissions of nitrogen oxides (NOx) which can affect the human breathing.
In order to reduce NOx emissions, manufacturers are adopting the SCR (Selective Catalyst Reduction) system, the efficiency of which has already been proven since this system has been used on trucks and heavy vehicles in general since several years.