Review by the Particle Measurement Program expert group of research on airborne particles from non-exhaust sources, especially particulates from brake friction materials and tires. The PMP group is evaluating whether such non-exhaust particulates represent an appropriate and feasible concern for further consideration as a possible regulatory issue.

Status report on the group’s current activities, including work on a new regulation covering heavy-duty dual-fuel retrofit systems.

Pursuant to GRPE 68th session discussions, further updated proposal for the second phase amendments to the retrofit emission control devices regulation from the REC informal working group.

Further updated proposal for the second phase amendments to the retrofit emission control devices regulation from the REC informal working group.