The European emission standards, or Euro standards (harmful emissions classifications), define the emission classes for new automobiles. Harmful emissions play an important role in the control of a vehicle. The legislation is also in line with the classification in the different Euro standards. The code number in the vehicle registration certificate indicates the emission class for every automobile.
The statutory regulations controlling emissions have become gradually more stringent: Just recently, the European Parliament has again decided to lower the limits for harmful emissions from cars. Euro 5 took effect on September 1st 2009. At the same time, the EU has already informed the automotive industry of the proposed limits of the Euro 6 standard (to be enforced from 2014).