Abstract: Fungal spores in city air have been associated with respiratory allergies among the human population. The precise sources of such spores, in particular for episodes of the allergenic genera, Cladosporium and Alternaria, have been topics of scientific debate. Here we explore the hypothesis, that such episodes can be explained by emissions from distinct vegetation types followed by local or long distance transport. This hypothesis is tested by investigating a 10-year record of spores in the air of Copenhagen, available from the Danish pollen and spore monitoring program through Asthma-Allergy Denmark. These data were supplemented by a dedicated emission study during harvest of cereal crops. At the seminar we will discuss options for future interdisciplinary research, with the goal of using atmospheric transport models for the prediction of clinically relevant episodes of allergenic spore concentrations.