Development of Chemical Weather Forecast Environmental impact by transboundary air pollution (i.e., acid rain related species and photochemical ozone) as a consequence of increase in amount of air pollutants releases by rapid economic developments of developing countries, such as China, has been pointed out. The possible manifestation of plant and soil damage by acid rain due to transboundary pollution in Japan has also been suggested at the beginning of 21st century. There is thus a need for research and development of detailed atmospheric environmental prediction and evaluation system for the area including Japan. It is necessary to create "the chemical weather forecast map" showing spatial distribution and time variation of atmospheric concentration. This research consortium will target the development of an atmospheric environmental simulation model in order to demonstrate a chemical weather forecast map in the East Asian region. Moreover, we are also planning to develop the forecasting of yellow sand storms as a natural base pollution.