The wet-depositions of rime, fresh snow and winter rain fall were collected on the summit of Mt. Kajigamori (ALT. 1400m), where is the watershed protection forest of Riv. Yoshinogawa. The insoluble particulate matter included in the wet-deposition was obtained by filtration with 0.45μm pore-sized filter. Small spherical particles such as flyash were found in the residue by SEM-EDX analysis. The amount of residue was increasing in the order of rain< snow< rime, and was influenced by the back trajectory of air mass. The suspended particulate matter such as black belt was able to observe above Shikoku Island, Japan
