Berlin 'diesel ban', 'Fahrverbot' or Euro 6 diesel low emission zone: first of 7 has now started.
Stuttgart Smog Alarm is triggered from 3 December 2019.
Lorry low emission zone on the A12 motorway in Austria tightens to Euro 5
The London Ultra LEZ has reduced NO2 by 32 µg/m3, traffic by 9%, CO2 by 13%
Stuttgart Smog Alarm period starts again on 15 October 2019 for 6 months.
Stockholm will have a Euro 6 low emission zone in a part of the city center from 15 January 2020 on.
Milan Area C tightens to petrol: Euro 2; Area B tightens to diesel: Euro 4 on 1 October 2019.
EU project ReVeAL to help cities improve liability through Urban Vehicle Access Regulations
HGVs over 12T in Greater London need a Safety Permit from October 2020, permits October 2019.
Milan tightens its standards for entering the Area B from 1 October 2019 on.
Berlin city will have a Euro 6 LEZ soon, date to be confirmed, see here for updates.