What are CAZ? An Updated Guide to Clean Air Zones in 2026
Clean Air Zones (CAZ) have emerged as a critical response to escalating air pollution issues in the UK.
Our cities are bearing the brunt of poor air quality. A 2016 study underscored the severity of the problem, revealing that air pollution affects nine out of 10 people living in cities. With the UK’s urban population reaching 56.5 million in 2022, air pollution is a pressing matter for anyone who lives or travels into urban centres.
Despite being launched in 2020, clean air zones remain a mystery for most motorists. Join us as we detail the role and impact of CAZs, and how they impact you as a driver.
What is a Clean Air Zone (CAZ)?
Simply put, clean air zones are designated areas in UK cities with stricter rules for vehicles to reduce air pollution. These zones have been implemented by local governments to combat growing air pollution in urban areas.
Birmingham council introduced a CAZ in June 2021. Researchers found that it led to a 13% drop in nitrogen dioxide (NO2) levels six months after implementation, compared to data from 2019.
There are four types of Clean Air Zones, categorised from Class A to D, in which certain types of vehicle are includes:
- Class A: Buses, coaches, taxis, and private hire vehicles.
- Class B: Includes above and heavy goods vehicles.
- Class C: Includes above and vans and minibuses.
- Class D: Includes above and cars (some local authorities also include motorcycles).
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What Are Emission Standards and How Do They Impact CAZ?
Emission standards determine the maximum amount of pollutants vehicles can emit. In clean air zones, these standards play a crucial role in restricting vehicle access based on their emissions.
Different emission standards, such as Euro 6 and Euro 4, are set by regulations to limit harmful exhaust gases like nitrogen oxides (NOx) and particulate matter (PM). Here’s how CAZ applies these standards:
- Euro VI: Required for buses, coaches, and heavy goods vehicles entering CAZ. This standard ensures lower emissions of NOx and PM.
- Euro 6 (diesel) and Euro 4 (petrol): Mandatory for vans, minibuses, taxis, private hire vehicles, and cars. Euro 6 for diesel vehicles and Euro 4 for petrol vehicles signify cleaner emissions compared to older standards.
- Euro 3: Minimum standard for motorcycles allowed in CAZ, focusing on reducing emissions from these vehicles as well.
If you are wondering what your vehicle’s emission standard is, you can find the information in your vehicle log book or consult your manufacturer.
Ensuring your vehicle meets or exceeds these standards is essential to avoid charges when driving through or operating within a CAZ.
Which Vehicles Are Exempt from Clean Air Zones?
Certain vehicles are exempt from CAZ charges, depending upon their emission levels and designated use.
You’re automatically exempt from paying a charge if your vehicle falls into one of these categories:
- Ultra Low Emission Vehicles (ULEVs): Vehicles that emit very low levels of pollutants, typically electric or plug-in hybrid vehicles.
- Disabled Passenger Tax Class Vehicles: Vehicles registered in the disabled passenger tax class.
- Military Vehicles: Vehicles used by the military.
- Historic Vehicles: Vehicles that meet the criteria for historic vehicle status.
- Clean Vehicle Retrofit Accreditation Scheme (CVRAS): Vehicles retrofitted with technology accredited by CVRAS to reduce emissions.
- Certain Types of Agricultural Vehicles: Vehicles used primarily for agricultural purposes.
Local exemptions may also apply depending on the specific Clean Air Zone. It is worth consulting your local council’s website to find additional vehicle exemptions or allowances.
How Do I Know If My Car Is Exempt From CAZ?
The UK Government website provides a simple CAZ checker to see if your car is exempt from CAZ according to the latest regulations. Here’s how to check:
- Visit the Official Government Website: Go to the official Clean Air Zone section of the government’s website.
- Enter Your Vehicle Details: Input your vehicle registration number or other required details into the Clean Air Zone checker.
- Review Your Vehicle’s Status: The checker will verify if your vehicle meets the necessary emission standards or qualifies for any local exemptions. It will also indicate if there are specific local exemptions applicable to your vehicle.
Regularly checking your vehicle’s status is essential to ensure compliance with CAZ regulations. If your vehicle does not currently qualify for exemption, it may be worth upgrading your vehicle to avoid CAZ charges.
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Where Are Clean Air Zones Located?
Seven major cities in the UK already feature clean air zones. This figure is expected to expand to eight when Greater Manchester completes its review. Here is an overview of the cities and the size of their CAZ:
- Bath: 1.2 square miles
- Birmingham: 2.96 square miles
- Bradford: 9.35 square miles
- Bristol: 1.18 square miles
- Portsmouth: 1.16 square miles
- Sheffield: 0.9 square miles
- Tyneside (Newcastle and Gateshead): 0.94 square miles
It’s important to note that London operates under the Ultra Low Emission Zone (ULEZ), which is separate from traditional CAZ but serves a similar purpose.
By registering on the government website, you gain access to detailed maps of clean air zones, information on when they become active, and details about potential exemptions. This will allow you to plan around these zones effectively and avoid unnecessary expense.
How Do I Pay for Clean Air Zones?
The actual amount you will pay for CAZ charges differs depending on locality and the type of vehicle you are driving. They typically range between £10-60, although the top end is aimed at heavy goods vehicles.
Thankfully, the payment process of clean air zone charges is far more straightforward. You have two ways of paying before or after you enter the zone.
- The primary method for paying CAZ charges is through the official government portal. This online platform allows you to register your vehicle, check if charges apply, and make payments securely.
- You can also make payments by calling the National Contact Centre on 0300 029 8888 (Monday to Friday, 8am to 8pm, and Saturday, 8am to 4pm).
Important Notes on CAZ charges:
- Payments can be made 6 days before or after the day you enter the clean air zone.
- Charges apply per calendar day, which runs from midnight to midnight, not from the exact time you enter the zone.
- You can drive in and out of the CAZ multiple times within the same day and only pay one charge. However, be aware that if you enter the zone before midnight and leave after midnight, you’ll be charged for two separate days.
Why Are Clean Air Zones Being Implemented?
Air pollution is identified as the greatest environmental threat to health in the UK, according to Imperial College London. Annually, it contributes to approximately 30,000 premature deaths in under-75s and costs the UK economy £20 billion.
CAZ is a response which directly targets reduction in air pollution. Government studies indicate that while assessing the direct impact of one action on air quality can be complex due to various influencing factors like weather patterns, Clean Air Zones have shown promising results.
Conclusion
Clean air zones represent a crucial step towards improving air quality and public health in urban areas across the UK. By targeting vehicle emissions, CAZ can help mitigate the significant health risks posed by air pollution.
In case you missed it:
- CAZ are implemented to reduce harmful pollutants such as nitrogen oxides and particulate matter, addressing the greatest environmental threat to health in the UK.
- Studies show that CAZ have contributed to a reduction in air pollution levels, though effectiveness is influenced by various factors including weather and ongoing improvements in vehicle emissions standards.
- Compliance with CAZ regulations is essential to avoid penalties and support ongoing efforts for cleaner air and sustainable urban living.
Discover how you can finance your next vehicle while prioritising eco-friendly options. Reach out to one of our friendly specialists at Car Loans UK to explore a car finance solution that aligns with CAZ regulations.
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