Generally EIA on development works is done in the designing stage, so it is not easy to change the design. If EIA was done in the planning stage, development works could be discussed usefully in terms of the protection of environment. In the planning stage ETA aims at giving an outline of an impact, because the details are not yet agreed upon.
As a case study of diffusion of exhaust gas from vehicles, the forecast method on personal computer was studied for EIA in the planning stage, and the program was made for this case. It was demonstrated that the forecast on personal computer was effective to EIA in the planning stage.
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