Clean air zones, also known as ultra low emission zones or zero emission zones, are designed to improve urban air quality by discouraging the most polluting vehicles from entering those areas. Cars aren’t banned from the zones, but drivers of vehicles which do not have the cleanest engines have to pay a daily charge to travel within those areas.
As of mid-2022s, there are 14 clean air zones either operating or expected to be operating soon in the UK. Bath, Birmingham and Portsmouth are in force, with schemes in Bradford and Bristol to be introduced later in 2022. You can check the clean air zones section of the government website to learn whether you must pay to enter a clean air zone. All you need is your car’s registration number.