The aim of this research work was determination of humidity impact on yeast and moulds survival in fibrous filters. It was revealed that water content of about - 53-113% stimulated growth of fungi, especially in case of moulds. In stable filters humidity conditions (50% of weight), a number of fungi reached I 04 CFU/cm2 after 84 days, with the most intensive growth during first 7 days of the experiment. In the case of very low humidity ( 13% and less), the growth of fungi was not observed.

The aim of this research was to evaluate the microbiological indoor air contamination level in chosen facilities of the primary health-care for adults and children. The total numbers of mesophilic bacteria, staphylococci, coli-group bacteria and moulds in both surgery rooms and patients’ waiting rooms were determined. Air samples were collected with a MAS 100 impactor and the concentration of microorganisms was estimated by a culture method. The microbiological air contamination level was diverse: the number of mesophilic bacteria ranged from 320 to 560 CFU/m3, number of staphylococci - 10-305 CFU/m3, coli group bacteria - 0-15 CFU/m3 and moulds - 15-35 CFU/m3. The bacteriological contamination level of the air in examined community health centers was higher than described in the literature for hospitals and exceeded the acceptable values proposed for the surgery objects.