抄録
It is reported that by the results of a experimental research there will be a considerable relation between the wind velocity and the density of outdoor dusts, that is, when the wind is dead the density of dusts in the open air will be a large amount. Besides by the fundamental consideration on air pollution in rooms due to dust particles the density of dusts in rooms is closely related with the density of dusts in the open air. In rooms and in the open air, dusts were counted every hour and these periodical variations were shown in fouriers series, and then were examined in averages, widths of vibrations and time lags. Results obtained are as follows: (I) In ventless rooms, there will be a final density of dusts which depends on an amount of dusts produced and fallen in the room. (II) In rooms where the amount of dusts infiltrated is always constant, a final density of dusts is determined by those amounts of produced, fallen and infiltrated dusts and further by the volume of air to be introduced into the room per hour and the total volume of the room. The density of dusts. in these rooms at any time is shown as equation (4.6). (III) When the variation curve of the number of dusts in the open air is given as equation (4.26), the variation in rooms is shown as equation (4.32). Thus the outdoor air pollution produces a sharp influence on general rooms. When these considerations are followed with the investigation on the amount of dusts fallen and produced in many sorts of rooms, the treatment in regard to problems of dusts in rooms will be better done.
