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 MARTINBONNEL PierreKÜHLWEIN JÖRGPROVENZA ALESSIOLAMBRECHT UdoALESSANDRINI StefanoCARRIERO MassimoCOLOMBO RinaldoFORNI FaustoLANAPPE GastonLE LIJOUR PhilippeMANFREDI UrbanoMONTIGNY FrancoisSCULATI Mirco
Citation: ATMOSPHERIC ENVIRONMENT vol. 62 p. 657-665
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
Publication Year: 2012
JRC Publication N°: JRC71076
ISSN: 1352-2310
URI: http://www.sciencedirect.com/science/article/pii/S1352231012008412#
http://publications.jrc.ec.europa.eu/repository/handle/JRC71076
DOI: http://dx.doi.org/10.1016/j.atmosenv.2012.08.056
Type: Articles in Journals
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:Institute for Energy and Transport

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