Real-world diesel car emissions

A new study has compared official laboratory-test and on-road nitrogen oxides (NOx) and carbon dioxide (CO2) emissions for 541 Euro 5 and Euro 6 diesel passenger cars, representing 145 of the most popular European models.

For the Euro 5 diesel cars tested, the actual NOx emissions were on average more than four times the legal limit of 180 mg/km and for Euro 6 cars, the average emission level was 4.5 times the legal limit of 80 mg/km. The difference between individual vehicle models is particularly remarkable, with some Euro 6 diesel cars emitting less NOx than the limit, while others exceed the regulatory limit by a factor of 12. Only 10 per cent of tested Euro 6 vehicles would meet the Euro 6 limits on the road.

Looking at CO2 performance, the average divergence for both Euro 5 and Euro 6 cars was approximately 30 per cent. The discrepancy among newer vehicles was even higher, with 2015 cars on average emitting 40 per cent more CO2 and consuming 40 per cent more fuel than advertised.

Source: ICCT, 3 September 2017.


In this issue