Article from Transportochlogostik.se
IVL: Continued high emissions from new diesel cars
Published by, Christer Wiik – June 30, 2017
Diesel cars in the latest environmental class, Euro 6, release about five times as much nitrogen oxides in real mileage as required by law. This is a survey conducted by IVL Swedish Environmental Institute. In the study, exhaust emissions from more than 30,000 cars are measured outside Gothenburg traffic.
– This confirms what we have previously done; that even the latest diesel cars have high emissions of nitrogen oxides. It shows that legislation and previous emissions controls have unfortunately not worked properly, “said Åke Sjödin, researcher at IVL Svenska Miljöinstitutet.
This is the first time that such massive measurements of Euro 6 cars’ actual emissions are presented. IVL has previously noted the problem of poor test cycles, high emissions in real driving for diesel cars and the poor air quality that this results in. One purpose of the study has therefore been to evaluate the actual emissions of diesel vehicles, in particular vehicles classified according to the emission requirements for Euro 5 and Euro 6, as they currently constitute a majority of the Swedish fleet. Diesel cars in these environmental classes today account for one fifth of Sweden’s total nitrogen oxides emissions, about as much as all truck traffic in Sweden releases.
The measurements in Gothenburg show that improvements have been made with the latest Euro 6 emissions standard. On average, emissions of nitrogen oxides in real mileage have decreased by about 60 percent for Euro 6 compared with previous Euro classes. For example, Volkswagen has their Euro 5 diesel cars among the highest emissions, while their Euro 6 cars are found among those with the lowest emissions. Euro 6 trucks and buses also have significantly lower emissions than previous Euro classes.
– This can still be seen as a breakthrough. In the past, we have practically not seen any change in emissions between Euro 2 and Euro 5 exhaust standards in real-life driving. Now, we are finally seeing a decline in Euro 6 cars, although it is a long way before they meet the expectations imposed by the legal requirements, “said Åke Sjödin.
But still driving around many diesel cars with higher emissions on our roads. The study saw major differences between different brands, models and individual vehicles. Emissions of nitrogen oxides are also higher at lower ambient temperatures, which is unfavorable for Sweden. For Euro 5 cars, it is about 60 percent higher emissions at 10 plus degrees compared to at 25 degrees.