Abstract
For reducing the indoor air pollution in connection with microbes, it is important to clarify quantitatively the actual contamination status of the microbes in an air-conditioning system which greatly affects the indoor air quality. This paper reports the results obtained from the survey about the growth environment and the pollution actual status of microbes in the air-conditioning systems equipped in eight office buildings in Tokyo. The main conclusions obtained from this research are as follows. (1) By measurement of the growth speed of Alternari alternate, Eurotium herbariorum, Aspergillus penicillioides which used as a biosensor in this study, it is shown clearly that the environment down stream of a coil is favorable environment for the microbes of the 70-95% of the minimum relative humidity for growing. (2) On some object surfaces of an air filter, a coil, and a humidifier, when many, 10,000 microbes per square centimeter were measured.
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