The Euro emission standards set the maximal limits about rejections of pollutants (nitrogen oxides, carbon monoxide, hydrocarbons and particles) for vehicles. These standards, which have been considerably strengthened, aim to limit the air pollution due to road transport. The current norm is Euro VI.  The Euro VII standard is expected to enter into force in 2025.

NGV environmental efficiency is far better than traditional fuels’ one.This efficiency can be seen through nitrogen oxides emissions or micro particles emissions. Both pollutants are strongly concentrated in high density urban areas.