AEROSOL SAMPLING AND WIND STUDIES FOR THE IDENTIFICATION OF POLLUTANTS SOURCES

A two-stage streaker sampler was exposed to collect size-fractionated aerosol samples in Geneva. Samples were analysed by particle induced X -ray emission (PIXE) at the Van Der Graaff facility of the INFN of Flo rence. Hourly concentration of elements from Na to Pb were measured bo th for the fine (aerodynamic diameter, D-ac <2.5 mu m) and coarse (2.5 < D-ae < 10 mu m) fraction. Data were analysed by applying the time s eries and principal component analysis (PCA) and the source profiles b y unique ratios (SPUR) technique. Correlations with atmospheric parame ters (wind direction and speed, pressure, temperature, etc.) have been studied. A picture of the aerosol composition of Geneva and of its so urces is presented. (C) 1998 Elsevier Science Ltd. All rights reserved .