Vehicle Emissions Testing Programme: Moving Britain Ahead

In September 2015 the United States Environmental Protection Agency (EPA) alleged that diesel passenger cars manufactured by the Volkswagen Group had been fitted with defeat devices. Following this disclosure, Volkswagen announced that 11 million vehicles were affected worldwide with 1.2 million of those in the UK. The Secretary of State for Transport ordered an investigation to establish whether the use of these strategies was wider than the Volkswagen Group. This involved the retesting of the most popular diesel vehicles in the UK to provide clear information to the public and reassure them that appropriate actions are being taken. In addition, this programme was designed to help quantify the divergence of on-road emissions from those measured in laboratories during the type approval process, and to help understand the variation between the current emissions standard (Euro 6) and its predecessor (Euro 5). Other countries also set up programmes to retest diesel vehicles at the same time as the UK. It was agreed with Germany that the technical teams would work cooperatively together and other EU partners were also contacted throughout the test programme to discuss the methodology and findings. This report sets out the context in which testing was undertaken. It then sets out how the tests were undertaken and presents the high level results. Whilst the testing was not a comprehensive review of all vehicle emissions, the Department for Transport (DfT) went to significant lengths to ensure that the sample tested was representative of the UK car fleet as a whole, that the vehicles were tested using the latest technology for best accuracy, and that the tests took into consideration conditions and environmental factors. DfT also ensured that testing was carried out completely independently of vehicle manufacturers, and was independently verified.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 40p

Subject/Index Terms

Filing Info

  • Accession Number: 01610832
  • Record Type: Publication
  • ISBN: 9781474131308
  • Report/Paper Numbers: Cm 9259
  • Files: TRIS
  • Created Date: Apr 26 2016 9:00AM