Assessment of microbial contamination of atmospheric air in a selected wastewater treatment plant

: The aim of the research was to determine the microbiological quality of atmospheric air in the Tuchów Sewage Treatment Plant, based on the presence of mesophilic bacteria, α - and β -hemolytic bacteria, actinomycetes and fungi. Bioaerosol measurements were made at four points (raw sewage inlet, aeration chamber, puri fi ed sewage outlet and 150 m from the treatment plant, at the background point) in the period from January to December 2018. Bioaerosol samples were collected using Andersen’s 6-stage cascade impactor. The tested atmospheric air was characterized by a qualitatively and quantitatively diverse micro fl ora. The highest amounts of all the studied groups of microorganisms were found at the raw sewage inlet, and in the case of actinomycetes, also twice in the place of