4.4. Calculation of the emission mass flow rates

Directive 2005/55/EC of the European Parliament and of the Council of 28 September 2005 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 (Text with EEA relevance) · European Union

The emission mass flow rates (g/h) for each mode shall be calculated as follows, assuming the exhaust gas density to be 1,293 kg/m3 at 273 K (0 C) and 101,3 kPa: where NOx conc, COconc, HCconc (3) are the average concentrations (ppm) in the raw exhaust gas, as determined in Section 4.1. If, optionally, the gaseous emissions are determined with a full flow dilution system, the following formulae shall be applied: where NOx conc, COconc, HCconc (3) are the average background corrected concentrations (ppm) of each mode in the diluted exhaust gas, as determined in Annex III, Appendix 2, Section 4.3.1.1.

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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.