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The both materials of sea salt and of continental origin are extremely concentrated in snow over Japan facing the Sea of Japan. The annualy averaged concentration of chemical components in precipitation is controlled by the distance from the coast, the wind velocity or the frequency of violent storms and the absolute humidity of the source air mass which depends on the air temperature. Among these the effect of violent storms is the strongest. The strong winter-monsoon is the cause of the high concentration in precipitation over the coastal area of the Sea of Japan. There is a discontinuity in the yearly fall rates of chemical components such as Pb-210 between the both sides of the Japanese Islands and thus a model of the atmosphere having more than two layers is necessary to explain the behavior of the atmospheric chemical components.