1. A system, comprising: an emergency notification device being disposed at a location, the emergency notification device having a sensor for sensing an environmental parameter at the location, the emergency notification device being programmed with a predefined sensor-data profile indicative of a dangerous condition, the emergency notification device being configured to wirelessly output an emergency notification in the event that sensor data sensed by the sensor at the location corresponds to the predefined sensor-data profile that is indicative of a dangerous condition; a handheld computing device for obtaining the emergency notification wirelessly outputted by the emergency notification device, the handheld computing device being configured to output a visual representation of the emergency notification, the handheld computing device being configured to enable user feedback related to the emergency notification; and a host facility being communicatively coupled via a back channel to the emergency notification device or the handheld computing device for obtaining information related to the user feedback or information related to the sensor data sensed by the sensor at the location.