From your link: found that not one single brand complies with the latest air pollution limits (‘Euro 6’) for diesel cars and vans in real-world driving The im

From your link: found that not one single brand complies with the latest air pollution limits (‘Euro 6’) for diesel cars and vans in real-world driving The important bit is "real-world driving". As far as we know everyone optimized for the test and yet the driving cycle was not realistic. That is not illegal and supposedly the test has now been improved. What VW was caught doing is much worse than that, it's actually cheating during the test. Emissions testing has been shown to be highly fallible but what VW was caught doing is on another level.