Inorganic Constituents in Precipitation in Yonezawa City

Each ion concentration of sodium, potassium, calcium, magnesium, ammonium, chloride, nitrate, and sulfate, as well as preciptation amount, electric conductivity and pH have been measured for each rainfall or each snowfall.

Maximum value, minimum value, mean value, composition ratio and so on are summarized in every each year. By the blow of north west seasonal wind which sprouts from the winter over the early spring, the material which seems to be sea salt from the Sea of Japan and acid deposition from the continent are observed. Measurements are continued at present.