EAN (“European Aeroallergen Network”) is a pool for the pollen and fungal spore data of European pollen information services, individual measurement sites as well as of data suppliers beyond Europe. The network covers 38 countries and more than 600 measurement sites. Currently, up to 400 of those measurement sites are active. Up to 226 different aerobiological particles are evaluated, including especially relevant pollen and fungal spores for pollen and fungal spore allergy sufferers.