Long-Term Averaged Concentration Estimation of Instantaneously Discharged Air Pollutants Using the Meteorological Scenario Days

The meteorological scenario days are representative samples of a variety of daily meteorological conditions which occur during risk estimation period. In the present study, we proposed a simple method using meteorological data of the meteorological scenario days and the Trajectory-puff model, to get long-term averaged concentrations of air pollutants which are discharged instantaneously. Assuming that air pollutants were discharged instantaneously at a point of the Fukusima first nuclear power plant, seasonal long-term averaged concentrations are calculated. Applicability of the method was examined by comparing this seasonal mean concentrations by using the meteorological data with those by using meteorological data of whole three months. Inaddition, ausage of the method was investigated by comparing with monitoring date of radioactive materials.