The real-time modeling system, named AirWatch System, has been developed to evaluate the environmental impact from the large source. It consists of stack TMS that measures the emission data from the source, AWS (Automatic Weather Station) that monitors the weather data and computer system with the dispersion modeling software. The modeling theories used in the system are Gaussian and puff models. The Gaussain model is used for the dispersion in the simple terrain with a point meteorological data while the puff model is for the dispersion in complex terrain with three dimensional wind fields. AirWatch System predicts the impact of the emitted pollutants from the large source on the near-by environment on the real-time base and the alarm is issued to control the emission rate if the calculated concentrations exceed the modeling significance level. The AirWatch System is an effective tool to manage the large emission facility in the environmentally sound manner.
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