Fog water was collected at Mt.Hachimantai, Akita, in Northern Japan. The ionic components in the fog water were analyzed. Though it is well-known that ionic pollutants in air mass are taken in by fog droplets, in this work, the effects of the wind speed on the ion concentration were investigated. As a result, it was found that the ion concentrations of natural fog tended to increase or decrease with increasing in wind speed, depending on a meteorological conditions during an anticyclone or a cyclone. This difference of tendencies would be caused by the effects of an ascending current in a cyclone (diffusion of pollutants) or a descending current in an anticyclone.
