{
  "url": "https://openlegislation.uk/eu-regulation-2008-692/annex-III/division-3/division-3.8",
  "json_url": "https://openlegislation.uk/eu-regulation-2008-692/annex-III/division-3/division-3.8.json",
  "legislation": "eur/2008/692",
  "legislation_title": "Commission Regulation (EC) No 692/2008 of 18 July 2008 implementing and amending Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2008-692",
  "path": "annex/III/division/3/division/3.8",
  "kind": "division",
  "number": "3.8",
  "heading": null,
  "text": "The second subparagraph of paragraph 1.3 of Appendix 8 to Annex 4 shall be understood as:\n‘ … The dilution factor is calculated as follows:\nFor each reference fuel, except hydrogen\nDF = X C CO2 + C HC + C CO × 10 − 4\nFor a fuel of composition CxHyOz, the general formula is:\nX = 100 x x + y 2 + 3,76 × x + y 4 − z 2\nIn particular for H2NG, the formula is:\nX = 65,4 × A 4,922A + 195,84\nFor hydrogen, the dilution factor is calculated as follows:\nDF = X C H2O − C H2O − DA + C H2 × 10 − 4\nFor the reference fuels contained in Annex IX, the values of “ X ” are as follows:\nFuel\nX\nPetrol (E5)\n13,4\nPetrol (E10)\n13,4\nDiesel (B5)\n13,5\nDiesel (B7)\n13,5\nLPG\n11,9\nNG/biomethane\n9,5\nEthanol (E85)\n12,5\nEthanol (E75)\n12,7\nIn these equations:\nC CO2 concentration of CO 2 in the diluted exhaust gas contained in the sampling bag, expressed in per cent volume,\nC HC concentration of HC in the diluted exhaust gas contained in the sampling bag, expressed in ppm carbon equivalent,\nC CO concentration of CO in the diluted exhaust gas contained in the sampling bag, expressed in ppm,\nC H2O concentration of H 2 O in the diluted exhaust gas contained in the sampling bag, expressed in per cent volume,\nC H2O-DA concentration of H 2 O in the air used for dilution, expressed in per cent volume,\nC H2 concentration of hydrogen in the diluted exhaust gas contained in the sampling bag, expressed in ppm,\nA quantity of NG/biomethane within the H2NG mixture, expressed in per cent volume ’ .",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Regulation (EU) No 630/2012 of 12 July 2012 amending Regulation (EC) No 692/2008, as regards type-approval requirements for motor vehicles fuelled by hydrogen and mixtures of hydrogen and natural gas with respect to emissions, and the inclusion of specific information regarding vehicles fitted with an electric power train in the information document for the purpose of EC type-approval (Text with EEA relevance)."
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Substituted by Commission Regulation (EU) No 136/2014 of 11 February 2014 amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 as regards emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and Commission Regulation (EU) No 582/2011 as regards emissions from heavy duty vehicles (Euro VI) (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2008/692/annex/III/division/3/division/3.8",
    "retrieved_at": "2026-11-01T14:52:09.943760+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}