Managing Application-level QoS for IoT Stream Queries in Hazardous Outdoor Environments Topics: Data and Knowledge Management ; Data Processing ; Internet of Things; Performance Evaluation and Modeling ; Smart City Examples and Case Studies; Software Architecture and Middleware In Proceedings of the 4th International Conference on Internet of Things, Big Data and Security IoTBDS - Volume 1, 223-231, 2019 , Heraklion, Crete, Greece