Micromycetes are important components of dust, their abudance and diversity of species often determine the degree of their destructive impact on objects of the surroundings, people and other bionts. In 2006–2008, studies on dust micromycetes contamination of the premises used for different purposes were carried out. Penicillium, Aspergillus, Cladosporium, Mucor, Rhizopus fungi comprise the largest mycobiotic portion of the indoor dust. The abundance of other micromycetes detected in dust (e. g. Alternaria, Botrytis, Chrysosporium, Geotrichum, Paecilomyces, Scopulariopsis, Wallemia, Mycelia sterilia) significantly increases during the plant vegetation season. Non-living mechanical parts of dust could be treated as components of microorganism substrate, which induces or inhibits vital functions of microorganisms propagules present in dust. Microelements (Co, Ti, Cr, Mn, Fe, Co, Zn) recorded in dust in small amounts, could become such indicators. During further development, majority of micromycetes are able to minimally supply α_ω. A great number of micromycetes of the same species were found in the composition of dust in different settings. Micromycetes capable of producing volatile substances, mycotoxins and allergens were detected in the dust of all the investigated settings.

Keywords: dust, workplaces, settings, micromycetes, diversity, pollution, dangerous sources