Road test reveals cars emit seven times the permitted level of exhaust emissions when tested in real-world conditions
Nine out of 10 new diesel cars break new EU pollution limits when tested on roads rather than test tracks, according to a new report.
On average, the cars emit seven times the permitted level of NOx gasses, with the worst car producing 22 times the legal limit. Models from every major motor manufacturer breached the limit when they were evaluated in real-world conditions.
From 1 September, new diesel cars in the EU have had to comply with emissions rules called “Euro 6”. However, carmakers can use a whole range of techniques to ensure that their cars perform far better under test conditions than when driven by ordinary drivers.
These include stripping components from the car to reduce weight, using special lubricants, over-inflating tyres and using super-smooth test tracks. The same techniques are used to boost the apparent fuel efficiency of vehicles.
Read more: The Guardian