Car Emissions Standards: Euro Ratings Explained for UK Drivers

Summary

• Euro ratings measure emissions: Higher numbers mean cleaner cars. Euro 6 is the current standard.
• They affect clean air zones: Older cars with lower Euro ratings may face charges in cities.
• Check your car's rating with our ULEZ check tool.

You've probably heard terms like "Euro 6" when shopping for a car or reading about clean air zones. But what do they actually mean?

This guide explains Euro emissions standards in plain English. No engineering jargon. Just the facts you need.

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What Are Euro Emissions Standards?

Euro emissions standards are rules that limit how much pollution a car can produce. They've been in place since 1992 and get stricter over time.

Each new Euro standard forces car makers to produce cleaner vehicles. The standards cover pollutants like:

• NOx: Nitrogen oxides, harmful to lungs and air quality.
• CO: Carbon monoxide, a poisonous gas.
• PM: Particulate matter — tiny particles that cause breathing problems.
• HC: Hydrocarbons, which contribute to smog.

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Euro Standards Timeline

Standard	Date Introduced	Applies To
Euro 1	1993	All new cars from this date
Euro 2	1996	Tighter CO and HC limits
Euro 3	2001	First NOx limits introduced
Euro 4	2006	Key for petrol ULEZ compliance
Euro 5	2011	DPF required for diesel cars
Euro 6	2015	Key for diesel ULEZ compliance
Euro 6d	2021	Real-world driving emissions testing

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Why Euro Ratings Matter to You

Your car's Euro rating affects several things:

Clean Air Zones

Many UK cities now have clean air zones. Older, more polluting cars pay a daily charge to enter. The rules are usually:

• Petrol cars: Must be Euro 4 or later (roughly 2006 onwards) to avoid charges.
• Diesel cars: Must be Euro 6 or later (roughly 2015 onwards) to avoid charges.

Check our clean air zones guide for details on every zone in the UK.

Resale Value

Cars with higher Euro ratings hold their value better. Buyers want to avoid clean air zone charges and future restrictions.

Car Tax

First-year car tax rates are linked to CO2 emissions. Lower emissions mean lower tax in the first year.

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How to Check Your Car's Euro Rating

There are several ways to check:

1. V5C logbook: Check section D.2 for the emissions standard. Read our V5C guide for help.
2. ULEZ check: Use our ULEZ checker to see if your car meets ULEZ standards.
3. Registration date: Use the dates in the table above as a rough guide based on when your car was first registered.

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Is Euro 7 Coming?

Yes. The EU has proposed Euro 7 standards. These will be stricter and also cover tyre and brake particle emissions for the first time.

Euro 7 is expected to apply to new cars from around 2025-2027. The UK may adopt similar standards post-Brexit.

For most drivers, this won't affect current cars. But it will influence what new cars are available in the coming years.

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What About Electric Cars?

Electric cars produce zero tailpipe emissions. They're exempt from all current clean air zone charges and receive the lowest car tax rates.

If you're worried about emissions rules affecting your car, going electric removes the problem entirely. Read our electric car guides to learn more.

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Understanding Euro ratings helps you make smarter decisions about buying, selling, and driving in the UK. Check your car's rating, know the clean air zone rules in your area, and plan ahead for any future changes.

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