3 February 2021 Minutes of the 17th PTI informal group session PTI-17-10	PTI-17-10	2021-02-03
4 February 2021 Agenda for the 19th PTI informal group session PTI-19-01	PTI-19-01	2021-02-04
3 June 2021 PPM: Introduction in the Netherlands of the new PTI particle test for DPFs (Netherlands) GRPE-83-24	GRPE-83-24	2021-06-03