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|Title:||Will Euro 6 reduce the NOx emissions of new diesel cars? - Insights from on-road tests with Portable Emissions Measurement Systems (PEMS)|
|Authors:||WEISS MARTIN; BONNEL Pierre; KÜHLWEIN JÖRG; PROVENZA ALESSIO; LAMBRECHT Udo; ALESSANDRINI Stefano; CARRIERO Massimo; COLOMBO Rinaldo; FORNI Fausto; LANAPPE Gaston; LE LIJOUR Philippe; MANFREDI Urbano; MONTIGNY Francois; SCULATI Mirco|
|Citation:||ATMOSPHERIC ENVIRONMENT vol. 62 p. 657-665|
|Publisher:||PERGAMON-ELSEVIER SCIENCE LTD|
|Type:||Articles in periodicals and books|
|Abstract:||The nitrogen dioxide (NO2) pollution in urban areas of Europe can be partially attributed to the increasing market penetration of diesel cars that show higher distance-specific nitrogen oxides (NOx) emissions than gasoline cars. The on-road NOx emissions of diesel cars, furthermore, appear to exceed substantially applicable emissions standards. This observation raises concerns that the introduction of more stringent Euro 6 emissions standards in 2014 may not adequately reduce the distance-specific on-road NOx emissions of new diesel cars. We address the existing concerns by analyzing the gaseous emissions of one novel Euro 6 diesel car and six Euro 4-5 diesel cars with Portable Emissions Measurement Systems (PEMS). We find that the average on-road NOx emissions of the Euro 6 car (0.21 ± 0.09 gram per kilometer [g/km]) are considerably lower than those of the Euro 4 cars (0.76 ± 0.12 g/km) and the Euro 5 cars (0.71 ± 0.30 g/km). The selective catalytic reduction (SCR) system of the Euro 6 diesel car is suitable to limit NOx emissions during real-world on-road driving. Still, all tested cars, including the Euro 6 diesel car, exceed their NOx emissions standards on the road by 260 ±130%. This finding suggests that the current type-approval procedure does not adequately capture the on-road NOx emissions of diesel cars. By introducing a complementary emissions test procedure that covers a wide range of normal operating conditions, the European legislative authorities can address this problem and ensure that Euro 6 will indeed deliver an adequate reduction in the NOx emissions of new diesel cars.|
|JRC Institute:||Energy, Transport and Climate|
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