137. The representative of the European Union, speaking on behalf of the Chair of the IWG on Particle Measurement Protocol (PMP), informed AC.3 a working document for a new UN GTR on laboratory measurement of brake particle emissions for heavy-duty vehicles was expected to be considered during the ninety-fifth GRPE session in October 2026 with a view to have a vote in AC.3 in March 2027.

138. He outlined the content of the draft proposal technical requirements of the test facilities with fixed dimensions of the brake dynamometer layout and fixed airflow were specified. He said the test cycle was developed from available real-world driving data and existing driving cycles around the world. He concluded the proposal also addresses the calculation of emission factors at brake-corner level, together with the associated reporting requirements.