72. The representative from the EC introduced GRPE-85-34 on the particle number measurement during Periodic Technical Inspection (PTI) tests. The Chair recommended to harmonize the activities between the EC and the IWG on PTI that is working on similar issues. He also informed GRPE that the Co-Chair of the IWG on PTI from the Netherlands agreed to table the proposed amendment to R.E.6. in GRPE prior to WP.29 submission. The representative from the EC expected to release a first draft of their recommendations to European authorities one month after the GRPE session and agreed to share and collaborate with the IWG on PTI.

73. The representative from Spain, supported by the representative from CITA, called for in-depth harmonization of the methodology and not-to-exceed limits, which the Chair fully supported; The Chair also suggested an updated Type 2 test might be need in type approval legislation to provide a basis for comparison at PTI tests. GRPE agreed to keep this item on the agenda for forthcoming sessions of GRPE.