34. The Chair of the IWG on Particle Measurement Programme (PMP) presented a status report on the activities of the group on exhaust and non-exhaust particle emissions (GRPE-75-17). He explained the scope and the suggested setup of the Round Robin test to assess differences and uncertainties in the measurement of exhaust particles with a size below 23 nanometre. He informed GRPE about the activities on raw exhaust sampling, Round Robin test for Particle Number Counter calibration, Horizon 2020 projects and gas engine testing. He mentioned some communications between the IWGs on PMP and WLTP on possible cooperation on low temperature testing. Regarding non-exhaust particle emissions, he focused on the three-step approach for the development of the methodology for brake wear particles measurement (braking test cycle representative of real-world conditions, methodology for sampling brake wear particles, methodology for brake wear particles measurement and characterization). He announced the group’s target to finalize the development of the braking test cycle by the end of 2017. He underlined that a brake dynamometer test rig appeared to be the best solution of the three sampling methods considered.

35. GRPE acknowledged the progress made by the IWG on PMP and noted the request for a meeting room for half a day during the GRPE week in January 2018.