01
Read available vehicle data
The lookup uses available vehicle evidence such as fuel type, Euro status where supplied, registration-date evidence, type approval, wheelplan and revenue weight.
Free UK emissions-zone checker
ULEZ Checker UK, Clean Air Zone, LEZ & ZEZ
Car Facts UK Clean Air Zone,ULEZ, LEZ & ZEZ Checker
Car Facts UK Clean Air Zone, ULEZ, LEZ & ZEZ Checker
Check your vehicle against UK Clean Air Zone, ULEZ, LEZ and Oxford ZEZ rules using available DVLA vehicle emissions data.
Before you check
Enter a UK registration first, then select a city or scheme. Car Facts UK automatically identifies the physical vehicle type from available official vehicle data and checks the available emissions evidence against the selected scheme. Always confirm the result with the relevant official service before travelling or paying.
How the checker works
How Car Facts UK calculates a Clean Air result
The result is calculated from the vehicle information available for the registration, the physical vehicle type and the published rule structure for the selected zone. Where the available evidence is not strong enough for a safe automatic indication, the checker returns CHECK REQUIRED rather than inventing missing vehicle data.
01Read available vehicle data
The lookup uses available vehicle evidence such as fuel type, Euro status where supplied, registration-date evidence, type approval, wheelplan and revenue weight.
02Apply the selected zone rule
The checker combines that evidence with the automatically identified physical vehicle type and the rule set held for the chosen ULEZ, LEZ, CAZ or ZEZ scheme.
02
Apply the selected zone rule
The checker combines that evidence with the automatically identified physical vehicle type and the rule set held for the chosen ULEZ, LEZ, CAZ or ZEZ scheme.
03Return the safest supported outcome
The engine can return compliant, not compliant, charge applies, not charged, information only or check required. Unresolved evidence is not silently converted into a pass or fail.
03
Return the safest supported outcome
The engine can return compliant, not compliant, charge applies, not charged, information only or check required. Unresolved evidence is not silently converted into a pass or fail.
Current checker coverage
UK clean-air schemes covered by this checker
This checker currently covers the UK schemes shown below. The list is generated from the same scheme data used by the calculator, helping keep the information shown here aligned with the checks available above.
Emissions reference
Common minimum emissions standards at a glance
These are headline standards used across major UK clean-air schemes. The actual result still depends on the selected zone, vehicle class, exemptions, retrofit records and the evidence available for the individual registration.
Evidence & verification
Official sources
Car Facts UK is an independent checker. Use the relevant official service to confirm exemptions, permits, retrofit records and the final charge or enforcement position before travelling or paying.
GOV.UK — English Clean Air Zones →Transport for London — ULEZ / LEZ vehicle checker →Scotland — official Low Emission Zone service →Oxfordshire County Council — ZEZ checker →Clean Air Greater Manchester — official Clean Air Plan →Liverpool City Council — official Clean Air Plan guidance →
Official scheme references reviewed 1 September 2026.
Keep checking
Related Car Facts UK tools
Clean-air eligibility is only one part of buying and running a vehicle. Continue with the checks that are relevant to your decision.
What is the difference between ULEZ, CAZ, LEZ and ZEZ?
ULEZ is used for London's Ultra Low Emission Zone, CAZ is used for English city Clean Air Zones, LEZ is used for low-emission restriction schemes such as the Scottish city LEZs and London LEZ, and ZEZ means Zero Emission Zone, including Oxford's active pilot. Charging, restriction, exemption and vehicle-class rules vary by scheme.
What do Clean Air Zone classes A-D mean?
In England, the CAZ class determines which vehicle categories are normally in scope. Class A covers buses, coaches, taxis and private-hire vehicles; Class B adds HGVs; Class C adds vans and minibuses; Class D adds cars, with local authorities able to include motorcycles. The selected zone still controls the actual result.
Why might the result say check required?
A CHECK REQUIRED result means the available vehicle data or vehicle-class evidence is not strong enough for a safe automatic indication. Euro status may be absent, or a scheme may require weight, use or classification evidence that the lookup cannot establish confidently. Car Facts UK does not invent a Euro standard.
Why vehicle type matters
A private car, van, minibus, HGV, bus/coach or motorcycle can be treated differently depending on the zone. Car Facts UK identifies the physical vehicle type automatically from available official vehicle data; if it cannot do so safely, the result is CHECK REQUIRED rather than a guessed class. Taxi and private-hire licensing can still require separate official confirmation.
Why you should still check the official service
Local exemptions, permits, disabled tax classes, resident rules and scheme updates can affect charges. Car Facts UK provides an indication based on available vehicle data, not an official charge decision.
Built for UK vehicle buyers
Use this free checker alongside MOT, tax, mileage and full history checks to understand potential ownership costs before buying or travelling.