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February 22, 2019 | MSN Autos
Overall, the average NOx recording for Euro 6d TEMP-standard diesel cars, over the course of a variety of tests including lab conditions, the real world and cold-weather, was 20mg/km. The real world standard is 168 mg/km. There you have it. An on-average standard that’s 8.4-times lower than the real world standard.
The latest cleaning technology, including selective catalytic reduction and on-demand urea injection, kept the cars comfortably within nitrogen oxide standards. The BMW and Peugeot, running the 20d diesel engine and 2.0 BlueHDi engine respectively, both Euro 6d standard, were particular star performers.
The Peugeot in the WLTC test, Real Drive Emission (RDE), ADAC Ecotest and Autobahn test, got a high recording of 45 mg/km. The BMW got a high of 84 mg/km during the Autobahn testing but massively excelled in the other tests, with a low of just 13 mg/km in the WLTC test.
Both the Peugeot and the BMW produce averages well under 80 over the course of a strong variety of tests, including on-road testing. The Volvo didn’t have it quite so easily. The first three tests saw it perform adequately, but the Autobahn test saw a spike, at 239mg/km. The cause? Good old consumption of fuel – the Volvo used over a litre/100km more than the Peugeot and the X2 during the ADAC Ecotest.
All three scored under 10mg/km of NOx. The BMW and the Astra registered just one mg/km. The Citroen scored seven mg/km. The highest score out of seven cars tested, by 16mg/km, was the Volvo, with 56 mg/km.