Measurements of aerosol particles and light scattering coefficient were carried out at Nagoya in Japan during the Asian dust-storm events in April in 1979 and 1980. Asian dust-storm particles collected with an impactor were examined through a transmission electron microscope and most of them were found to be mainly composed of water-insoluble material showing irregular shape on the collecting surface. The mean ratio of maximum length to width is 1.4 for these particles. It is also found that most of these particles were surrounded by water-soluble material.
