Many cities in Germany are being taken to court because the air quality does not meet the required standards. 

Cologne and Bonn have to implement a diesel driving ban for older diesel vehicles decided the Cologne administrative court.

The Cologne Low Emission Zone area is larger from 1 October 2019.

Paris is going to tighten the standard for its ZCR (restricted traffic zone) from June 2019 on.

Only vehicles that meet the standards for the Crit'Air sticker 3 are allowed to circulate.