Our guide below will answer many of the questions you might have on the clean vehicle retrofit accreditation scheme (CVRAS), low emission zones (LEZ), clean air zones (CAZ) and London’s ultra low emission zone (ULEZ).
The clean vehicle retrofit accreditation scheme (CVRAS) focuses on larger vehicles such as buses, coaches, heavy goods vehicles (HGVs) as well as vans and minibuses.
- There are no CVRAS approved retrofit exhaust emission reduction systems for either Euro 3 (generally pre-2004) petrol or Euro 5 (generally pre-2015) diesel passenger cars.
- There are also no CVRAS approved engine replacement solutions, as changing the engine of a vehicle will not lead to changes in the Euro status or recorded nitrogen oxide (NOx) emissions with the Driver Vehicle and Licensing Agency (DVLA).
The clean vehicle retrofit accreditation scheme (CVRAS) supports the operation of clean air zones (CAZ). The aim of the scheme is to address the air pollution emissions from buses, coaches, heavy goods vehicles, mini-buses, taxis and vans. To learn more about CVRAS, download a free copy of Zemo Partnership’s Clean vehicle retrofit technology guide.
FAQs
Approved CVRAS manufacturers, products and devices
The lists below contain approved and CAZ compliant companies and emission reduction systems..
- The full list of CVRAS approved manufacturers and devices (last updated July 2024)
- The list of CVRAS products and services no longer available (last updated July 2023)
CVRAS retrofit vehicle type overview
Get CVRAS certified
Manufacturers of abatement equipment must get approved by CVRAS before it can be added to the list of approved devices available to vehicle and CAZ scheme operators.
Emission reduction systems will need to demonstrate robust technical performance before they can be approved. Manufacturers will also need to have quality management systems to certified, for example, ISO 9001. Please see the scheme documentation below for further details.