[janwl]

There are EU-wide mandatory air quality standards that get stricter as time passes and that are being enforced through low emissions zones which practically make diesel cars illegal. This may not be the case in your country yet but it will arrive with time.

Regarding driving aids, some cities in my European country are looking to make them mandatory in the city centre.

Overall this is being done to keep poor people from driving.

[ErroneousBosh]

My nearly 30-year-old Range Rover is fully ULEZ compliant nearly everywhere in Europe except Paris, because it can run on propane which only really emits water and warm carbon dioxide when it burns - no "smog", no NOx, no HC, no CO, none of that.

Annoyingly in post-Brexit Britain I need to wait two years until is *is* 30 years old to drive in ULEZ zones. It was fine until Brexit kicked in - yet another Conservative disasterpiece.