16. Discussions stressed the need for further investigations as well as a need for guidelines for gathering future data to ensure it’s comparable. The group again suggested this is not the highest priority… Health relevance can be determined only after know what particles are – also what happens to the particles in the environment – do they persist?

17. JRC will prepare a summary of their findings, the group discussion and consensed points and a draft of the guidelines for gathering further data (eg tailpipe vs. CVS) for review at PMP 29th meeting.

18. Regarding active regeneration – need to develop some recommendations and procedures OICA tasked with collecting available data (if any) and prepare guidelines for measuring on standardized basis.

19. Investigating particle nature: Hans –Georg Horn (TSI) offered to check and report back what techniques are available.