For the determination of microorganisms in the air
of investigated rooms Petri dishes were exposed for 15
minutes. There were 12 series examinations made. All
samples were taken in September (before the beginning
of the academic year) and October (during academic year)
in two running years – 2002 and 2003. There were two
periods in a day of taking samples. The first one in the
morning from 730 a.m. to 8 a.m. (before the beginning of
lectures) and the second one in the afternoon from 230 p.m.
to 3 p.m. (before the end of lectures). The total number of
samples was 2,832.