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CAESRS (Chemical Accident Emergency Search and Rescue System) was developed for the use of monitoring the leakage of hazardous chemicals and guaranteeing the safety of people in hazardous areas. Technologies such as WSN (wireless sensor network) and mobile robot need to be integrated to build up CAESRS. We describe the components of the generic CAESRS's architecture in detail. A small-scale demonstration experiment is presented to highlight the concept and application of the CAESRS to an actual chemical accident. Although our proposed system architecture provides a versatile framework for integration, a number of new and interesting research problems need to be solved before actual deployment of the system.