A fire alarm system includes a fire alarm control panel (FACP) and an addressable signaling line circuit (SLC) operably coupled to the FACP for communicating with addressable components, including a plurality of sensors. The sensors can include a plurality of atmospheric sensors operably coupled to the SLC and each configured to provide information about their local atmospheric environment. Also provided is a mobile robot addressable and dispatchable by the fire alarm control panel (FACP) to an area indicated by sensors that are detecting a hazardous or potentially hazardous condition. The robot has mobile sensors that are configured to obtain verification of the hazardous or potentially hazardous condition and the robot is further configured to communicate the verification to the FACP.