Proposal from the Particle Measurement Programme informal group to:

• Modify the existing solid PN measurement methodology having a 50% cut-off size at 23 nm (SPN23) in order to allow the use of catalyzed volatile particle remover (VPR) and introduce minor improvements, and
• Include as a second option a solid PN measurement methodology with a 65% cut-off size at 10 nm (SPN10).

The first part of the PMP Brake Protocol for measuring brake particle emissions and addresses items using a new WLTP-Brake Cycle in conjunction with an inertia dynamometer test. The PMP Brake protocol will include three sections aiming to provide a comprehensive protocol for testing facilities:

• Inertia Dynamometer Protocol to Measure and Characterise Brake Emissions Using the WLTP-Brake Cycle;
• Part 2: Minimum Requirements and Guidelines for Sampling and Measurement of Brake Emissions for Particle Number and Particle Mass;
• Part 3: Reporting Test Results from Brake Emissions Testing.

Proposal to update the PMP mandate with a view to delivering the following results:

• Proposal for a new methodology for exhaust PN measurement with a d50 cut-off size reduced to 10 nm: June 2020
• Proposal for HD raw exhaust PN sampling and extension of sub-23 nm procedure to HD engines: January 2021
• Proposal for LD PN-PEMS 10 nm specifications : June 2021 (tbc)
• Proposal for a common test procedure for the measurement of particle brake emissions from conventional ICE LDVs: December 2021.