Finnish Meteorological Institute EUMETNET Technical University of Munich, Centre of Allergy and Environment University of Cordoba, Departament of Botanics, Ecology and Vegetation Physiology NILU Norwegian Institute for air research University of Vilnius, Siauliai Academy University of Turku Helmut Hund Wetzlar GMBH CNR Consiglio Nazionale delle Ricerche BioSense, Research and Development Institute for IT in Biosystems MeteoSwiss Federal Office of Meteorology and Climatology Swisens