4.3.1. Systems with constant mass flow

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

For systems with heat exchanger, the mass of the pollutants (g/test) shall be determined from the following equations: where: Concentrations measured on a dry basis shall be converted to a wet basis in accordance with Annex III, Appendix 1, Section 4.2. The determination of NMHCconc depends on the method used (see Annex III, Appendix 4, Section 3.3.4). In both cases, the CH4 concentration shall be determined and subtracted from the HC concentration as follows: GC method NMC method where:

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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.