Abstract: Unmanned aerial device for smoke and fire detection and method to monitor occupants are provided. The unmanned aerial device which is operatively coupled with at least one electromagnetic device includes a plurality of sensors configured to sense at least one of smoke and fire and to sense a temperature of at least one of one or more users and one or more objects within the pre-defined area. The unmanned aerial device also includes an image capturing device configured to capture one or more images and to capture one or more attributes associated with the corresponding at least one of the one or more users and the one or more objects, a thermal image capturing device configured to detect occupancy of the smoke and fire by an infrared sensor within the pre-defined area and to generate one or more thermal images.