2. The microbiological quality of the air in investigated
rooms was differentiated and changed significantly
in the course of the day. In afternoons the concentration
of bacteria and much more fungi increased a few
times. The only exception was the ventilated lecture
room, where the microbiological composition of the
air was stable within the day and even presented a
tendency to fall. The increased level of fungal flora
in sufficiently ventilated rooms could be a reason for
serious health problems of people occupying those
rooms.