There are many odor complains in Ansan and Siheung industrial complexes. In order to solve the odor problem, it is necessary to identify the major odor emission sources and to understand odor dispersion mechanism in these areas by applying the real-time odor monitoring system. The proposed system mainly consists of the measuring network of odor causing materials and meteorological variables as well as the dispersion modeling system on real-time base. In this study, the effective ways is also proposed to apply the system to ameliorate the odor environments.