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Information prioritization would be crucial for several emerging applications of wireless and sensor networks (WSNs) that require real-time event monitoring (disaster/intrusion monitoring, industrial automation, telemedicine). The current Quality-of-Service (QoS) literature for sensor applications is still premature, since most of the development efforts were focused on energy efficiency and sensor mote development. In this paper, we provide a system configuration of end-to-end QoS in an environmental monitoring network comprising local sensor and back-haul WiFi network technologies. We also demonstrate the performance gains achieved through rated bandwidth allocation for the sensor data flow across the integrated WSN.