Abstract
To examine the concentration of pollutants in the air of Osaka city and its suburbs simultaneously and systematically the concentrations of sulfur dioxide and dust at some settled points were measured all day long for 20 days. The fuchsin-formalin method for sulfur dioxide and the filter air sampler method for dust were adopted and the following results were obtained. (1) The concentration of sulfur dioxide rapidly decreased at the point far about 2 Km southern from Tennoji. This point did not change with the date and the time. (2) With regard to the concentration of dust such rapidly decreasing point as the case of sulfur dioxide was not observed and the concentration of dust decreased gradually as the distance from the center of the city increased.
