Clean air zone, Ultra Low Emission Zone, Zero Emission Zone – they go by many names and there’s likely to be one already operating, or coming soon, to a city near you. They’re designed to improve urban air quality by discouraging high-polluting vehicles from entering them. To do this they either charge a daily fee to the car’s owner or, as they do in Scotland, impose a penalty for entering them.
Most of these zones target buses, taxis and trucks but a few also target more highly polluting cars including comparatively new diesel models. Here’s our guide to where clean air zones are, which cars attract charges when entering them; how much those charges are and whether you can be exempt.