In the face of a lack of any official reference limit
for microbiological quality in indoor air it is difficult to
fully interpret our results. However, one of the valuable
proposals of reference data were so-called Residential
Limit Values (RLV) presented by Górny and Dutkiewicz
on the WHO Expert Meeting in Berlin, 2002 [22]. The
number of bacterial flora found in university rooms in
2002 hardly fitted an upper limit of these reference values,
whereas in 2003 they sometimes exceeded this limit
(5000 cfu/m3). The fungal concentration was not higher
than proposed RLV limit (5000 cfu/m3) but it overtook in
almost all cases the level of 250 cfu/m3 – the limit proposed
by the American Industrial Hygiene Association in
2001