A vehicle fitted with approved emissions equipment can meet the standard even though its original Euro class did not. The national Clean Air Zone exemption covers vehicles retrofitted with technology accredited under the Clean Vehicle Retrofit Accreditation Scheme (CVRAS). Problems arise when the retrofit is not on the record the cameras check.
Who recognises what
- Clean Air Zones in England: CVRAS-retrofitted vehicles are nationally exempt (GOV.UK).
- Bristol states that CVRAS-registered vehicles are not charged.
- Bradford offers a local route for private hire vehicles converted to LPG by a UKLPG-approved installer, at a minimum Euro 5 LPG standard.
- Several councils offer temporary exemptions while a retrofit or replacement is on order: Bristol's financial assistance exemption, Sheffield's "on order" exemption, and Tyneside's exemption of up to a year.
If you were charged
Send the CVRAS certificate or installer certificate with the date of fitting. If the retrofit was fitted after the journey, it does not help for that journey. If a temporary "on order" exemption was approved before the journey, send the approval.
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Questions people ask
Does an LPG conversion make my car ULEZ compliant?
TfL bases compliance on the vehicle's Euro standard. Check with TfL's vehicle checker and keep the conversion paperwork.
Sources
Last checked: 13 November 2026. Every fact on this page was checked against these official pages. How we check