feel free to actually read the article next time. theoretical emissions and clean diesel technologies that aren't actually implemented properly don't do us any good.

Here's some actual science from the BBC links in that article showing how not clean diesel engines perform in the real world:

“On average, we found that real-world nitrogen oxides emissions for modern diesel cars were about seven times higher than required by the Euro 6 standard”, says Dr. Peter Mock, Managing Director of ICCT Europe. The ICCT researchers demonstrate that the majority of exceedances found could not be attributed to extreme or untypical driving. Instead, they were due to driving situations that are part of the normal operation of diesel cars, such as mild uphill driving and regeneration events of the diesel exhaust aftertreatment system."

Diesel vehicles are the single largest contributor to total nitrogen oxide emissions in the EU. Especial in urban areas of Europe, measured nitrogen oxide emission levels are often higher than the legal limits, and some EU Member States are already facing legal actions for persistent air pollution problems.