Respiration by men is not limited to open atmospheric
media. The daily intake of air by
breathing in closed environments greatly outnumbers
the ingestion of other elements like water or
nutrients (Cardona, 2003). These and other arguments
justify the recent concern about the microbiological
quality of the indoor air. The term indoor
air usually applies to the air of non-industrial
interior environments, like colleges, hospitals, offices,
restaurants, homes and similar partially
closed settings. The indoor air quality (IAQ)
began to be taken into consideration during the
past 60´s when the problems on biological contamination
came into the focus of attention for
earlier environmental researchers (Pelczar & Reid
1966).