25. Progress update of this project was given by Francesco Riccobono (JRC).

26. Stability of the aerosol (thermal) for calibration: In considering the aerosols most similar to soot, it was found that the counting efficiency variation due to material dependency was in same order of magnitude as the measurements – soot-like” seems not to be a good criteria to select the standard aerosol, although need for harmonisation remains.

27. The next experimental setup will be to test many silver (Ag) generators; note silver is the furthest away from today’s materials …. This has implications on pass / fail of measurement results. CAST generators optimised for small size are quite similar now and should be compared to silver.

28. EMRP will finish in 2014. Feb 2014 meeting will discuss next steps and recommendations. For more information, see the EMRP website.

29. JRC also provided an update on periodic emission control metrological validation – see also (GRPE-PMP-28-05) – 7 instruments reviewed and tested. Research on-going for instruments to replace todays opacimeters – instruments evaluated show large variability at low PN / mass conc. and sizes.