# Clean Air Zone

A Clean Air Zone (CAZ) is an area in the United Kingdom where targeted action is taken to improve air quality. A CAZ can be non-charging or charging.
Whether a vehicle is charged when entering or moving through a CAZ depends on the type of vehicle and the Euro standard of the vehicle. The amount charged is up to the local authority responsible for the CAZ. Ultra-low-emission vehicles are not charged when entering or moving through a Clean Air Zone.

## Classes of charging Clean Air Zone

| Vehicle | Euro Category | Charge applies to vehicles below this Euro standard |
| Bus Coach | M3 | Euro VI |
| Taxi and private hire | M2, M1 | Euro 6 (diesel) Euro 4 (petrol) |
| Bus Coach | M3 | Euro VI |
| Heavy goods vehicle (HGV) | N2, N3 | Euro VI |
| Taxi and private hire | M2, M1 | Euro 6 (diesel) Euro 4 (petrol) |
| Bus Coach | M3 | Euro VI |
| Heavy goods vehicle (HGV) | N2, N3 | Euro VI |
| Taxi and private hire | M2, M1 | Euro 6 (diesel) Euro 4 (petrol) |
| Minibus | M2 | Euro 6 (diesel) Euro 4 (petrol) |
| Light goods vehicle (LGV) | N1 | Euro 6 (diesel) Euro 4 (petrol) |
| Bus Coach | M3 | Euro VI |
| Heavy goods vehicle (HGV) | N2,N3 | Euro VI |
| Minibus | M2 | Euro 6 (diesel) Euro 4 (petrol) |
| Light goods vehicle (LGV) | N1 | Euro 6 (diesel) Euro 4 (petrol) |
| Taxi and private hire | M1 | Euro 6 (diesel) Euro 4 (petrol) |
| Private cars | M1 | Euro 6 (diesel) Euro 4 (petrol) |
| Motorcycles (optional) Mopeds (optional) | — | Euro 3 |

## List of Clean Air Zones

| Region | Type | Date of implementation | Scope | Notes |
| Bath | Class C | 15 March 2021 | A wide central area | Reduced nitrogen dioxide levels by 26% in 2022/2023, meeting legal standards. |
| Birmingham | Class D | 1 June 2021 | All the roads within but not including the A4540 Ring Road | |
| Bradford | Class C+ | September 2022 | The area inside and including the Bradford outer ring road, extending to Shipley and Saltaire. | |
| Bristol | Class D | 28 November 2022 | A wide central area extending the North Somerset boundary, including the main route between Wales and Bristol Airport. | Originally planned as class B with additional diesel vehicle ban in parts of city centre between 07:00 and 15:00. Changed to class D due to government rejection. |
| Derby | Non-charging | 2020 | Traffic management measures on Stafford Street | |
| Greater Manchester | Class B | | All local roads in the county | Taxis and private hire vehicles registered within county exempt for first 12 months. Under review. |
| Leeds | Class B | | City centre | All roads within the boundary of the A61 and A63. Plans postponed in 2020 due to COVID-19 pandemic in England. |
| Leicester | Class A | | | Plans scrapped. |
| Newcastle | Class C | July 2022 | City centre | |
| Nottingham | Non-charging | 2020 | Retrofitting buses, regulating taxis, converting council-owned vehicles | |
| Portsmouth | Class B | 29 November 2021 | City centre area excluding port and naval base | |
| Sheffield | Class C | 27 February 2023 | Inner ring road and the city centre | |
| Southampton | Non-charging | 2020 | Retrofitting buses, regulating taxis, cleaner fuels and equipment at Southampton's port, cycling infrastructure | |

## Other emission zones

* Greater London has a Low Emission Zone and an Ultra Low Emission Zone, covering the majority of the city
** In central London there is a Congestion Charge, a different type of charge for motor vehicles
* Oxford has a Zero Emission Zone in the city centre
* Edinburgh, Glasgow, Aberdeen and Dundee each have a Low Emission Zone in their centres
Other LEZ in the UK :
| Region | Type | Start date | Scope |
| London | LEZ | 2008 | Covers HGVs and buses around the Greater London area |
| London | ULEZ | 2019 (expanded in 2021 and 2023) | Covers all other vehicles in the same area as the LEZ |
| Oxford | ZEZ | 2022 | Covers all non-electric vehicles in the city centre. Operational 07:00 to 19:00 including Sundays |
| Glasgow | LEZ | 2018 (expanded to cars in 2023) | Covers the city centre |