Highlights We investigated the change in visitation of urban green spaces (UGS) during COVID-19 pandemic. Social isolation reduced extent, type and distance of visited UGS on the basis of legal restrictions. Reasons for visiting UGS changed from non-essential before the pandemic to essential during it. Respondents missed visiting UGS regardless of the view of UGS from their window. Respondents expressed the need for UGS integrated within the urban fabric.

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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