Satomi MATSUU Sumiyo ISHIMATSU Yuji RYUThis report describes the results from an investigation of indoor environment, contamination state of a microbe by Andersen sampler, and Gram staining in two houses in Kitakyushu-city. The main conclusions obtained from this research are as follows.(1) The airborne bacteria concentration became high in the room where the resident was staying for a long time, and the airborne fungi concentration was high in the room where the windows were kept open frequently. (2) As a result of gram staining, the kinds of airborne bacteria are different by house. It seems that this is affected by the lifestyle.
This paper reports the experimental results about the effect of the filter performance on airborne microbial concentration in a building used actually. The main conclusions obtained from this research are as follows. (1) In relationships between the airborne fungi concentration of supply air and filter performance, airborne fungi concentration tended to decline with upgrading filter performance. (2) Almost all the airborne microbe concentration ratio between supply air and pit room air are less than 1.0. One reason is that airborne microbe concentration in the pit is higher than supply air.
In a building with geothermal utilization pit, concentrations of airborne microorganisms (cells/m 3 ) by a filter sampler and temperature-humidity conditions were measured for one year to investigate seasonal change. The concentrations of indoor airborne microorganisms were affected by the pit air rather than outdoor air, especially in October. Temperature-humidity conditions between cooling season and heating season were relatively different both in the building and the pit. In October, one special species of fungi was observed on culture plates of the pit, and that implies that temperature-humidity conditions would affect the growth of the fungus.
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