x], PM and NMVOC are important local pollutants that participate also as ozone precursors affecting the global atmospheric chemistry.
Similarly, gasoline vehicles have been estimated to contribute nearly to 75% of the total NMVOC emissions from the interurban road transport.
According to the European Commission, the emission standards of new heavy duty vehicles have been reduced by 88% (between 1982 and 2007), 95% (1982-2007), 97% (1982-2007) and 98% (1992-2007) for CO, NMVOC, N[O.
Interurban road modes present a high variation in emissions of pollutants depending on vehicle and fuel types: buses have pollutant intensity values similar to trucks for CO and NMVOC, and gasoline cars present values of over 5 g CO/p-km and 0.
The decrease of CO and NMVOC and the increase of N[O.