Criteria met if a combined authority has implemented a Clean Air Zone or Low Emission Zone that has been in operation since 2019 and it charges for private vehicles.
For this question the Clean Air Zone or Low Emission Zone does have to require charges for private vehicles.
A Clean Air Zone or Low Emission Zone is where targeted action is being taken to improve air quality and reduce the number of polluting vehicles and is usually defined over a certain area, such as a city centre.
A clean air zone that has been implemented by a constituent authority will count towards this point.