Abstract
In recent years, the needs of the risk assessment to increasing chemical substances such as trichloroethylene, tetrachloroethylene, benzene, etc are required. The chemical substances are mainly discharged in the atmosphere from the exhaust pipes or the stacks attached to the factory houses. The pollutants emitted from low stacks are affected by near buildings or the building on which exhaust pipes are attached and sometimes it causes high level pollution in neighbouring area. In this study, atmospheric diffusions of chemical substance emitted from a low stack on a building roof was studied numerically for various buildings and stack conditions, and compared with the results of the analytical model METI-LIS.
