The Particle Measurement Programme informal group was established to develop a more sensitive particle measurement system than the long-standing particulate matter mass measurement system. This phase concluded with the adoption into UN Regulations 83 (light duty emissions) and 49 (heavy duty emissions) of the particle number (PN) counting method, together with enhancements to the particulate mass (PM) measurement procedure. Initially the PN protocol was applied for diesel engines/vehicles only in R83.06 and [R49.0x] and subsequently has been extended to cover to spark ignition direct injection engined vehicles R83.06 (draft).
The European Union (EU) has requested further investigation of particle number emissions from spark ignition engines relating to particle size (reduction of the d50 cut off specification) and to emissions under rich operation conditions. Further activities to adapt the procedures/measurement equipment and establish appropriate limit values may be necessary based on the results of these investigations.
The PMP group expects to complete its current mission by June 2016. However, the group’s mandate could be extended in order to transpose the developed procedures into emissions-related global technical regulations, including the upcoming GTR on light vehicle emissions (WLTP).
Moreover, concerns over additional sources of particulates, such as tire and brake wear, have been raised and may require measurement procedures as well. The PMP group is developing GTR provisions for brake wear. Foundational documents can be found here.
| Particle Measurement Programme: Agenda for the 54th (January 2025) session |
| Reference Number: PMP-54.3-01 |
| Meeting Sessions: PMP-54.3 (27 Jan 2025) |
| Document date: 22 Jan 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Input for the 27 January 2025 PMP informal group session |
| Reference Number: PMP-54.3-02 |
| Submitted by: OICA |
| Meeting Sessions: PMP-54.3 (27 Jan 2025) |
| Document date: 28 Jan 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Proposal for Amendment 1 |
| Reference Number: PMP-54.3-04 |
| Meeting Sessions: PMP-54.3 (27 Jan 2025) |
| Document date: 28 Jan 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Table of amendment proposals |
| Reference Number: PMP-54.3-03 |
| Meeting Sessions: PMP-54.3 (27 Jan 2025) |
| Document date: 28 Jan 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Minutes of the 27 January 2025 PMP informal group web conference |
| Reference Number: PMP-54.3-05 |
| Meeting Sessions: PMP-54.3 (27 Jan 2025) |
| Document date: 29 Jan 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| PMP Task Force 3 - ILS-3 Phase 1 Results and Findings |
| Reference Number: PMP-54.3-06 |
| Submitted by: JRC |
| Meeting Sessions: PMP-54.3 (27 Jan 2025) |
| Document date: 26 Feb 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 54th (March 2025) session |
| Reference Number: PMP-54.4-01 |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 10 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
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| PMP informal group draft terms of reference |
| Reference Number: PMP-54.4-02 |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 11 Mar 25 |
| Relevant to: WP.29 Discussion Topic | Particle Measurement Programme, WP.29 Discussion Topic | Non-Exhaust Particle Emissions, GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, and WP.29 Regulatory Project | Tyre abrasion test method development |
| Click here to view the full document file |
| GTR 24: Input for the 11 March 2025 PMP informal group session |
| Reference Number: PMP-54.4-07 |
| Submitted by: OICA |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 11 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Proposal for Amendment 1 |
| Reference Number: PMP-54.4-06 |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 11 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Amendment 1 breakdown and status |
| Reference Number: PMP-54.4-05 |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 12 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Proposals for Amendment 2 |
| Reference Number: PMP-54.4-03 |
| Submitted by: EC |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 12 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Update on the inter-laboratory studies (ILS3) |
| Reference Number: PMP-54.4-04/Rev.1 |
| Submitted by: EC |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 13 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Interlaboratory study (ILS3) summary |
| Reference Number: PMP-54.4-09 |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 21 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 55th (March 2025) session |
| Reference Number: PMP-55-01 |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 24 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and WP.29 Discussion Topic | Particle Measurement Programme |
| Click here to view the full document file |
| Particle Measurement Programme (PMP): Proposal to update the terms of reference |
| Reference Number: PMP-55-02 |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 24 Mar 25 |
| Relevant to: UN Regulation No. 49 | Diesel and CNG/LNG Engine Emissions, UN Regulation No. 83 | Motor Vehicle Emissions, GTR No. 15 | Worldwide Harmonized Light Vehicle Emissions Test Procedure, WP.29 Discussion Topic | Particle Measurement Programme, WP.29 Discussion Topic | Non-Exhaust Particle Emissions, UN Regulation No. 154 | Light Vehicle Emissions Type Approval Test Procedure, GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, and WP.29 Regulatory Project | Tyre abrasion test method development |
| Click here to view the full document file |
| GTR 24: Proposal for Amendment 1 with tracked changes |
| Reference Number: PMP-55-03 |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 24 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Spreadsheet of proposed amendments |
| Reference Number: PMP-55-04 |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 24 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Technical report on the development of Amendment 1 |
| Reference Number: PMP-55-05 |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 24 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Health Effects of Automotive Brake and Tyre Wear Particles |
| Reference Number: PMP-55-10 |
| Submitted by: EC |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 25 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Tyre abrasion test method development, and WP.29 Discussion Topic | Non-Exhaust Particle Emissions |
| Click here to view the full document file |
| AEROSOLS: Air Quality and Health Impact of Primary Semi-volatile and Secondary Particles and Their Abatement |
| Reference Number: PMP-55-09 |
|
AEROSOLS Project Insights |
| Submitted by: UBA |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 25 Mar 25 |
| Relevant to: WP.29 Discussion Topic | Particle Measurement Programme |
| Click here to view the full document file |
| GTR 24: Amendment 2 proposals |
| Reference Number: PMP-55-08 |
| Submitted by: JRC |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 25 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: Interlaboratory study (ILS3) summary |
| Reference Number: PMP-55-06 |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 25 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Minutes of the 11 March 2025 PMP informal group session |
| Reference Number: PMP-54.4-08/Rev.1 |
| Meeting Sessions: PMP-54.4 (11 Mar 2025) |
| Document date: 25 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Input for the 55th PMP informal group session |
| Reference Number: PMP-55-07 |
|
| Submitted by: OICA |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 25 Mar 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 55th (July 2025) session |
| Reference Number: PMP-55.1-01 |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 09 Jul 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Indicative setup of the PM/PN sampling system |
| Reference Number: PMP-55.1-02/Rev.1 |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 10 Jul 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 55th (July 2025) session |
| Reference Number: PMP-55.1-14 |
| Meeting Sessions: PMP-55.1 (10 Jul 2025) |
| Document date: 15 Jul 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 55th (March 2025) session |
| Reference Number: PMP-55-11/Rev.1 |
| Meeting Sessions: 55th PMP session (25 Mar 2025) |
| Document date: 15 Jul 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Discussion Topic | Non-Exhaust Particle Emissions, and WP.29 Discussion Topic | Particle Measurement Programme |
| Click here to view the full document file |
| PMP task force on heavy-duty vehicle brake emissions test procedures: status report |
| Reference Number: PMP-55.2-02 |
| Submitted by: EC |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 55th (September 2025) session |
| Reference Number: PMP-55.2-01 |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| GTR 24: Proposal for amendments |
| Reference Number: PMP-55.2-03 |
| Submitted by: CLEPA |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| PMP: Overview of work on GTR 24 and heavy-duty vehicle brake emissions |
| Reference Number: PMP-55.2-04 |
| Submitted by: EC |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| ZF-AIP dustIN: Evaluation of PM-Multisampling |
| Reference Number: PMP-55.2-06 |
| Submitted by: AIP and ZF |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| GTR 24: C-Factor Calculation and Electromechanical Brakes |
| Reference Number: PMP-55.2-07 |
| Submitted by: Aumovio |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 26 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Inputs for PMP meeting on 26th of September 2025 |
| Reference Number: PMP-55.2-08 |
| Submitted by: OICA |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 29 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 55th (September 2025) session |
| Reference Number: PMP-55.2-09 |
| Meeting Sessions: PMP-55.2 (26 Sep 2025) |
| Document date: 30 Sep 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Particle Measurement Programme: Agenda for the 56th (October 2025) session |
| Reference Number: PMP-56-01 |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 13 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| GTR 24: Proposal to amend document WP.29/2025/84 |
| Reference Number: PMP-56-02 |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 13 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles |
| Click here to view the full document file |
| Heavy vehicle brake emissions: TF5 Cycle Candidate Revision |
| Reference Number: PMP-56-03 |
| Submitted by: LINK |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| GTR 24 and UNR on brake emissions: Input for PMP informal group discussions |
| Reference Number: PMP-56-04 |
| Submitted by: OICA |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles and UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system |
| Click here to view the full document file |
| Study on non-exhaust emissions in road transport |
| Reference Number: PMP-56-05 |
| Submitted by: EMISIA |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Tyre abrasion test method development, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| GTR 24: Inter-laboratory Study #3: Summary |
| Reference Number: PMP-56-06 |
| Submitted by: EC |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |
| Heavy-duty Brake Emissions Test Layout (PMP SG1) |
| Reference Number: PMP-56-07 |
| Submitted by: EC |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 15 Oct 25 |
| Relevant to: WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement |
| Click here to view the full document file |
| Particle Measurement Programme: Minutes of the 56th (October 2025) session |
| Reference Number: PMP-56-08 |
| Meeting Sessions: 56th PMP session (14 Oct 2025) |
| Document date: 27 Oct 25 |
| Relevant to: GTR No. 24 | Laboratory Measurement of Brake Emissions for Light-Duty Vehicles, WP.29 Regulatory Project | Heavy-duty Vehicle Brake Particle Emissions Measurement, UN Regulation No. 179 | Approval of vehicles with regard to the particle emissions of their braking system, and WP.29 Regulatory Project | Approval of Non-Original and Identical Brake Parts with regard to the Particulate Emissions |
| Click here to view the full document file |