The qualitative and quantitative composition of outdoor and indoor fungal aerosol

depends on numerous factors, e.g. suitable growth substrate, biorhythms of the species, biotic and abiotic factors that influence the release, dispersion, and deposition of fungal propagules (1). Members of Cladosporium, Alternaria, Penicillium and Aspergillus genera were permanently present in many aeromycological surveys of outdoor and indoor environments. In general, in temperate climate, including the Zagreb area, Cladosporium (up to 80%) and Alternaria (up to 60%) are the most abundant fungal entities with peaks in late spring and summer, while Penicillium (up to 70%) and Aspergillus (up to 40%) are more frequent in autumn and winter (1–3). These fungi are sometimes associated with several respiratory diseases such as chronic bronchitis, asthma, hypersensitive pneumo-