ntroduction:It is expected that about 600 stations for pollen andother biological particles in ambient air exist worldwide (Buters2014). However, currently no comprehensive information on pollenmonitoring sites is available as the map in the“Atlas of allergy”(Buters 2014) is already outdated and/or incomplete. In fact, in manycases no information, limited information, or false information onwho, where, what and...