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Clean Vehicle Retrofit Accreditation Scheme (CVRAS)

Accredits retrofit equipment to ensure that it meets minimum technical and emissions standards

Type of scheme

Certification and accreditation


Air quality



Back to support schemes

The CVRAS is a robust certification scheme for manufacturers of retrofit emissions reduction technology that will enable clean air zone (CAZ) compliance of legacy fleet vehicles. This certification scheme supports the operation of CAZs and addresses the air pollution emissions from buses, coaches, heavy goods vehicles, mini-buses, taxis and vans.

Manufacturers of abatement equipment need to get their equipment accredited before being added to the list of approved devices available to vehicle and CAZ scheme operators. This ensures that approved filters meet minimum technical standards and that vehicles fitting these approved emission reduction systems meet the national CAZ emissions standards.

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