ANNEX IVSupplementary provisions
ANNEX IV ‘ANNEX III VERIFYING EXHAUST EMISSIONS 1. INTRODUCTION 1.1. This Annex sets out the test procedure for verifying exhaust emissions. 2. GENERAL REQUIREMENTS 2.1. The requirements for conducting the tests and interpreting the results shall be those set out in Annex 4 to UNECE Regulation No 49, using the appropriate reference fuels as specified in Annex IX to this Regulation. 2.2. In the case of dual-fuel engines and vehicles, the additional requirements and exceptions set out in Appendix 4 to Annex 15 to UNECE Regulation No 49 when performing an emission test shall apply. 2.3. For testing positive ignition engines by using an exhaust dilution system, it is permitted to use analyser systems that meet the general requirements and calibration procedures provided for in UNECE Regulation No 83. In this case, the provisions of paragraph 9 and Appendix 2 to Annex 4 to UNECE Regulation No 49 shall not apply. However, the test procedures provided for in paragraph 7 of Annex 4 to UNECE Regulation No 49 and the emission calculations provided for in paragraph 8 of Annex 4 to UNECE Regulation No 49 shall apply.’;