A diesel car emits four times more NOx than a bus
The Norwegian Centre for Transport Research and the Finnish Technical Research Centre VTT have conducted emission measurements on 12 Euro VI heavy vehicles and seven Euro 6 diesel cars. The vehicles were tested in a laboratory under conditions that as far as possible should correspond to the actual use of the vehicles.
Their measurements show that Euro 6 type-approved diesel cars emit 4–20 times more NOx in city traffic and during cold weather than the type approval limit value of 80 mg/km. Moreover, the average NOx emissions from the tested Euro 6 diesel cars were about four times higher than the average NOx emissions from the tested city buses and heavy vehicles with Euro VI engines.