Abstract
We have been working on the problem of microbiological contamination of intra-mural air due to various sources. Some results of measurements, recently made in offices, underground shopping centers and dwellings, on airborne bacteria and fungi as particulate matter in reference to concentration, dissemination and other characteristics important from the stand point of engineering control, are reported. Settling plates and the Pinhole Samplers were used for sampling airborne microbes and the Andersen Samplers for sampling in various sizes. From the results, concentration variations, size distributions, average sizes in each sampling point were determined. The medians and standard deviations were also determined. Some results such as that medians of bacteria are larger than those of fungi showed the difference of state of particles of these two kind of microbes. Correlation of concentration and number of passers-by, decrease of number of microbes which disseminated into air and other results were also reported.
