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Clean Air Zones: Types and Emission Standards Required

clean air zones

How to know whether you are in a clean air zone, how to check if you’ll be charged in the zone or need to create a business account, read further to know the types of CAZs, and all the supported exemptions available.

A Clean Air Zone (CAZ) is introduced by some local authorities where a specific set of actions are taken to improve air quality by charging a daily fee for entering the zone. Affected vehicle owners are encouraged to upgrade their vehicles to fit the compliant standards.

Until then, Your exceeded emission standard vehicle may have to pay the charge to drive inside the clean air zone.

Which cities have clean air zones?

Here’s a list of contacts to find out about call charges.

Below are the cities where the CAZ is initiated.

CAZ CityClass
Bath Clean Air ZoneClass – C
Birmingham Clean Air ZoneClass – D
Portsmouth Clean Air ZoneClass – B
Cities with Clean Air Zones

Clean air zones 2022

CityWill Initiate From (year)
Bradford Clean Air Zone2022
Bristol Clean Air Zone2022
Greater Manchester CAZUnder Review
Upcoming Cities2022

What are the types of clean air zones?

CAZ is usually typed from Class A to Class D.

CAZ ClassVehicle type
ABuses, coaches, taxis, private hire vehicles
BBuses, coaches, taxis, private hire vehicles, heavy goods vehicles
CBuses, coaches, taxis, private hire vehicles, heavy goods vehicles, vans, minibuses
DBuses, coaches, taxis, private hire vehicles, heavy goods vehicles, vans, minibuses, cars, the local authority has the option to include motorcycles

What are the minimum emission standards required?

Every vehicle has its minimum emission standard based on its type and age. Don’t know your vehicle’s emission standards? You can find your vehicle’s emission standards directly in your logbook or by your vehicle manufacturer. You can also click here to find out directly from the official UK website after considering the requirements.

To avoid getting charged in the clean air zone, your vehicle must comply with the following minimum emission standards.

Vehicle typeClean air zone minimum standard
HGVs, Buses & CoachesEuro VI
Vans, Taxis, Minibusses, cars & private hire vehiclesEuro 6 diesel & Euro 4 petrol
MotorbikesEuro 3

Minimum emission standards set by local authorities may vary for taxis & private hire vehicles. It’s always suggested to call the local authorities to confirm whether you’ll need to pay the charges after entering the zone.

Clean air zone charges

The zone operates twenty-four hrs a day, seven days a week, every day for a whole year. The charge period is open from midnight to midnight. Therefore, if you are a business, you should always check your vehicle before entering the CAZ and pay for multiple vehicles reliably.

The charges must be paid by 11:59 PM precisely till the sixth day after driving in the zone. To make things easier, you can also opt to pay six days before travelling the zone. If not complied within this period, a penalty charge notice (PCN) will be filed.

Please note that the maximum payment that can be made to pay the charges in one transaction is £5,000. If the payment exceeds the limit, the transaction must be split.


Here are some local and national exemptions you will get from the charge.

You’ll be considered as a national exemption and won’t need to pay the charge if you hold:

  • A vehicle with an ultra-low emission standard.
  • A disabled passenger tax class vehicle.
  • A disabled tax class vehicle.
  • An army vehicle
  • An archaic vehicle (Originated by historical events)
  • A retrofitted vehicle with technology equipped by Clean Vehicle Retrofit Accreditation Scheme (CVRAS)
  • Certain types of agricultural vehicles
  • Specific types of agricultural vehicles.

Clean air zones help and support

If you are looking for support, you can contact the clean air zone help and support division.

Clean air zone support: Online contact form Telephone: 0300 029 8888 Time: Monday to Friday (8 AM to 7 PM) Saturday (8 AM to 2 PM)

Here’s a list of contacts to find out about call charges.

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