(b)

Commission Directive 2005/78/EC of 14 November 2005 implementing Directive 2005/55/EC of the European Parliament and of the Council on the approximation of the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles and amending Annexes I, II, III, IV and VI thereto (Text with EEA relevance) · European Union

for NG fueled gas engines Text of image D = FS cCO2 + (cNMHC + cCO) × 10–4 where: Concentrations measured on dry basis shall be converted to a wet basis in accordance with section 5.2 of Appendix 1 to this Annex. The stoichiometric factor shall be calculated as follows: Text of image FS = 100 × 1 1 + α 2 + 3,76 × (1 + α 4 - ε 2) where: α, ε are the molar ratios referring to a fuel CH α O ε Alternatively, if the fuel composition is not known, the following stoichiometric factors may be used: c CO2 | = | concentration of CO2 in the diluted exhaust gas, % vol c HC | = | concentration of HC in the diluted exhaust gas, ppm C1 c NMHC | = | concentration of NMHC in the diluted exhaust gas, ppm C1 c CO | = | concentration of CO in the diluted exhaust gas, ppm F S | = | stoichiometric factor F S (diesel) | = | 13,4 F S (LPG) | = | 11,6 F S (NG) | = | 9,5

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Source: EUR-Lex (Cellar) · retrieved 2026-11-10 · Text as adopted (Official Journal); later amendments are not incorporated in this text.