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Clean Air Zones: What New Pollution Rules Mean for You

View of a road sign with Clean Air Zone

Discover everything you need to know about Clean Air Zones, including how they affect you, emission standards for cars, and how to check vehicle compliance.

What is a Clean Air Zone?

What areas affect car drivers?

Overview of CAZ Classes


Vehicle type



Buses, coaches, taxis, private hire vehicles.

This class is primarily aimed at reducing emissions from high-usage, older public transport and commercial transport vehicles that contribute significantly to urban air pollution


Buses, coaches, taxis, private hire vehicles, heavy goods vehicles.

Expands upon Class A by also including heavy goods vehicles (HGVs). This class addresses larger vehicles that have a substantial impact on air quality due to their size and diesel engines, which are known for emitting higher levels of pollutants.


Buses, coaches, taxis, private hire vehicles, heavy goods vehicles, vans, minibuses.

Further extends the range of targeted vehicles to include vans and minibuses, in addition to those covered in Classes A and B. This class recognises the role of smaller commercial and passenger vehicles in contributing to traffic congestion and pollution within urban areas.


Buses, coaches, taxis, private hire vehicles, heavy goods vehicles, vans, minibuses, cars, the local authority has the option to include motorcycles.

The most comprehensive category, impacting all vehicle types covered in Classes A, B, and C, with the addition of private cars. Local authorities also have the discretion to include motorcycles in this class. Class D zones are designed to encourage a widespread shift towards cleaner transportation methods by applying charges to the most common types of vehicles on the road, including those used for personal transport.

Smoke coming from car exhaust

Which cities have Clean Air Zones?

Class B Zones

Class C Zones

Class D Zones

Navigating CAZs

If you currently live in a busy city, there has never been a better time to consider an electric or low-emission car, as you will not only benefit from avoiding costly emission charges, but your vehicle will also be compliant with any future city plans.

Keith Hawes
Director - Nationwide Vehicle Contracts

What emissions can my car have?

How to Check Your Vehicle's Emissions Standard

How much are CAZ charges?

Determining Charges

Exemptions and Discounts

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About the Author: Donna Kelly

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