The latest research carried out by Deutsche Umwelthilfe (Foundation for Environmental Aid) in real traffic conditions and temperatures below 16 degrees Celsius exposed the shocking truth about diesel cars. It turns out that these cars, despite high Euro standard at lower temperatures, emit surprisingly large amounts of exhaust. The worst performers were Fiat, Renault, and Mercedes B-Class.
The Deutsche Umwelthilfe Foundation has recently examined the level of exhaust emissions in passenger cars that meet the Euro 6 standard. The tests were carried out in real traffic conditions and at temperatures between -5 and +16 degrees Celsius. There were 15 passenger cars tested with a Diesel engine in Euro 6 emission class and one passenger car in the Euro 5 class.
It turned out that in winter the measurements of nitric oxide (NOx) emitted by cars exceeded the standard about 17 times (exactly 17.2 times). The foundation showed that this standard was exceeded by passenger cars of the same standard by an average of 9 times in the summer.
Disgraceful record holders
It turns out that 4 of the tested models with Diesel engines were in the Euro 1 standard introduced in 1992. The worst was the Fiat 500X 2.0 Cross 4 × 4 with a result of 1 380 mg NOx/km, exceeding the allowed emission limit (80 mg NOx/km) 17.2 times. Just behind Fiat was Renault Captur 1.5 dCi 110 with 1,316 mg NOx/km, exceeding the limit 16.5 times. The next on the list is the Volvo S90 4D with a score of 1,076 mg NOx/km (13.4 times the limit) and the Mercedes B 180 D with the result 1 039 mg NOx/km (13 times exceeding the limit).
Diesel passenger cars more poisonous than trucks
A research carried out by the Institute of ICCT (Council on Clean Transportation) confirms that NOx emitted by passenger cars with diesel engines exceeds the allowed limits and pollutes the environment much more than trucks. Researchers from ICCT confirmed that passenger cars, compared to loaded lorries and buses full of passengers, have up to 10-times higher emission of nitric oxide.
The results of recent studies are a clear signal that measures should be taken against the producers’ misrepresentation of emission measurements and appropriate controls introduced in this respect.