In this study, it is purpose to establish a forecasting method for conditions of air pollution at a seaside industrial area. Using the data in Mizushima industrial area, we investigated the relation between weather conditions and SO_x concentrations on the ground level. The distributions of SO_x concentration were calculated by the plume model at the weather condition in which this area was polluted. And the optimum parameters for the plume model by which the error between measured and calculated SO_x concentration became smallest were obtained. It was found that the optimum parameters could be correlated by the wind velocity
