Abstract
In order to estimate and control the levels of indoor pollutant's concentration, the mechanism of the concentration formation with large particles as well as small ones should be made clear. In this experimental study, we tried to clarify the dispersion range of large particles generated by dropping a weight onto a cushion placed on the floor.
The horizontal and vertical distributions of settled particles were microscopically examined, and the distance of dispersed particles larger than 10μm in size was found to be only 1-1.5m from the source with out air mouement or ventiration.
