The concentrations of microorganisms, aerosol black carbon and carbon dioxide (CO) in indoor and outdoor air of two kindergartens were investigated during four seasons. The highest mean concentrations of aerobic mesophilic microorganisms in indoor air were detected in spring. and were the most common fungi in all air samples. The concentrations of Staphylococci, Enterobacteria and CO had a positive correlation with the number of persons in the rooms. The highest mean concentration of black carbon in indoor and outdoor air was obtained in winter. Concentrations of CO exceeded 1000 ppm in 89.3% of the indoor air measurements. The reduction of the number of children in individual playrooms and more frequent ventilation are recommended for lowering the concentration of CO and the number of microorganisms in the air, especially potential pathogen fungi. The renovation of buildings with installation of effective artificial ventilation is recommended as well. CFU, Colony-Forming Unit; HPC, Heterotrophic Plate Count (Aerobic Mesophilic Microorganisms); YGC, Yeast Extract Glucose Chloramphenicol Agar; BC, Aerosol Black Carbon Particles; CO, Carbon Dioxide; PM, Particulate Matter.
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