Workpackage 1 New reproducible reference methods for PM10 and PM2.5 Workpackage 2 Methods for the analysis of major components of particulate matter and metals Workpackage 3 Establishment of specific calibration procedures for MPSS for ambient measurements and the provision of calibration facilities for CPCs to the CEN standard FprCEN/TS 16976. Workpackage 4 Quantifying airborne particle compositions in the field Workpackage 5 Development of traceable and reliable x-ray analytical techniques for chemical analysis of airborne particle Workpackage 6 Creating impact Workpackage 7 Management and coordination