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Aerobiology is an interdisciplinary science where researchers with different backgrounds are involved in different topics related to microorganism, airborne biological particles, e.g. pollen and spores, and phenology. Some concepts, words or expressions used in aerobiology have a clear definition, but are however frequently misused. Therefore, the working group "Quality Control" of the European Aerobiology Society (EAS) and the International Association of Aerobiology (IAA) would like to clarify some of them, their use and presentation. Allergen[n.m.]: any substance that can elicit allergic symptoms. Allergen concentration (ng/m 3 ) or (pg/m 3 ): the amount of allergen per unit volume of air expressed in nanograms/m 3 or picograms/m 3 Allergenic [adj.]: relating to or having the effect of an allergen. Allergology [n.f.]: a branch of medicine concerned with allergy.

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