Abstract
Concentration of particulate sulfur analyzed by PIXE technique, most of which can be regarded as sulfate, increased in a summer night at the same time over the wide area of the Kanto plain. Any emission source of the sulfate which may cause the increase in concentration at midnight could not be assigned in the urban area of Kanto district considering the meteorological condition and behavior of other pollutants. Since the effect of long range transport of particulate sulfurs was suggested, Lagrangian dispersion-advection analysis of particles was carried out using global scale weather analytical data. Results show that the concentration observed at the Kanto plain could be increased by the effect of volcanic gas which had been released from Sakurajima volcano befor 3 days or so.
