The Difference Between ULEZ and CAZ

15th Apr 2025

Introduction

Across the UK, new clean air regulations are being introduced to tackle rising air pollution levels. As cities take action, it’s important for drivers to understand how these changes affect them. Two major schemes you may have heard of are ULEZ and CAZ. But what exactly do they mean, and how do they differ?

At GMZ Motors, we’re here to help local drivers in Newcastle stay informed, compliant, and prepared. This article will break down the difference between ULEZ and CAZ, with a specific focus on the Newcastle Clean Air Zone.

What is ULEZ?

ULEZ stands for Ultra Low Emission Zone. It is currently only in operation in London and was introduced to improve air quality by discouraging high-polluting vehicles from entering the city.

The zone operates 24/7 and affects vehicles that do not meet minimum emissions standards. Petrol vehicles must meet Euro 4 standards, and diesel vehicles must meet Euro 6. Drivers of non-compliant vehicles are required to pay a daily charge, usually £12.50, to enter the ULEZ area.

If your car is compliant, there is no charge. ULEZ mainly targets older vehicles with higher emissions and is enforced using automatic number plate recognition (ANPR) cameras.

At GMZ Motors, we offer a wide selection of ULEZ-compliant vehicles to help you drive confidently through London without the extra charges. Explore our ULEZ stock here to find the perfect low-emission vehicle that meets your needs.

A label displaying the text "Ultra Low Emission Zone" indicating an area with reduced vehicle emissions.

What is CAZ?

CAZ stands for Clean Air Zone. While ULEZ is specific to London, CAZ is a national scheme introduced in various cities across the UK to reduce air pollution. There are four types of CAZ, known as Class A to D.

- Class A zones apply to buses, coaches, and taxis

- Class B zones include Class A vehicles plus heavy goods vehicles

- Class C zones include vans and minibuses

- Class D zones apply to all of the above plus private cars

Each local authority decides which class of CAZ they implement, depending on their pollution levels and transport needs.

Newcastle Clean Air Zone Overview

The Newcastle Clean Air Zone was introduced in January 2023 to tackle air pollution in the city centre. Newcastle has implemented a Class C CAZ, which means it targets commercial vehicles such as taxis, buses, coaches, HGVs, and vans.

Private cars are not currently subject to the clean air charge in Newcastle. However, drivers of non-compliant commercial vehicles must pay a daily fee to enter the zone. The clean air charge in Newcastle is £12.50 for vans and taxis, and £50 for buses and HGVs.

This initiative is designed to encourage the use of cleaner, more efficient vehicles and to improve overall air quality in the city.

Close-up of a sports car's front wheel, showcasing its sleek design and intricate details.

What Cars Are Exempt from Clean Air Zones?

You may be wondering what cars are exempt from clean air zone charges. In general, the following vehicles are exempt:

Petrol cars that meet Euro 4 emissions standards
Diesel cars that meet Euro 6 standards
Electric vehicles
Hydrogen fuel cell vehicles
Some hybrids, depending on emissions

You can check your vehicle’s compliance status by visiting the government’s official clean air zone checker at gov.uk/clean-air-zones.

Key Differences Between ULEZ and CAZ

The main difference between ULEZ and CAZ lies in their coverage, vehicle impact, and enforcement.

ULEZ is a London-specific scheme, applying charges to all non-compliant vehicles, including private cars. It operates 24 hours a day and has strict emissions requirements.

CAZ is a national scheme, and its impact varies depending on the class of the zone. In Newcastle’s case, private cars are not currently charged, but commercial vehicles are. Each CAZ may have different rules, hours of operation, and enforcement methods depending on the city.

Conclusion and Local Tips

Understanding what a clean air zone is and how it differs from ULEZ is essential for avoiding unnecessary fines and keeping your vehicle on the road.

The Clean Air Zone in Newcastle currently targets commercial vehicles, but staying informed about changes is key. Make sure your vehicle is compliant, and if you’re unsure, GMZ Motors is here to help. We offer emissions checks, MOTs, and expert advice to help you stay ahead of regulations and on the right side of the clean air charge in Newcastle.

If you have any questions or need support, visit GMZ Motors today. We’re proud to support Newcastle drivers in driving smarter, cleaner, and more confidently.

Quick Links

Check if your vehicle is compliant: gov.uk/clean-air-zones
Newcastle Clean Air Zone details: newcastle.gov.uk - Clean Air Zone

Visit GMZ Motors for emissions checks, MOTs, and advice: Contact GMZ Motors