A fire suppression system for a compartment of an aircraft, the system comprising: a sensor system locatable within the compartment, the sensor system including, at least, a first sensor and a second sensor, the first sensor configured to detect atmospheric substances within the compartment and the second sensor configured to detect only combustion products and/or fire within the compartment, wherein the first sensor is a photoelectric sensor configured to detect atmospheric substances by sensing a difference in obscuration level within the compartment due to existence of atmospheric substances and the second sensor is an ionization sensor configured to detect only combustion products and/or fire; at least one valve for regulating flow of a fire suppressant to the compartment; a controller configured to control flow of the fire suppressant, via the at least one valve, in response to input from the sensor system, the controller configured to provide instructions to discharge the fire suppressant if the first sensor detects atmospheric substances and the second sensor detects combustion products; and at least one suppressant sensor configured to determine concentration of the fire suppressant within the compartment, wherein the controller is operatively associated with the at least one suppressant sensor and the instructions to discharge the fire suppressant are determined, by the controller, based, at least in part, on the concentration of the fire suppressant within the compartment, wherein the controller is further configured to determine if the concentration of the fire suppressant, within the compartment, deviates from a desired concentration of the fire suppressant, within the compartment, wherein the controller is further configured to adjust flow of the fire suppressant if the concentration of the fire suppressant, within the compartment, deviates from the desired concentration of the fire suppressant, within the compartment, and wherein if the second sensor continues to detect combustion products and/or fire, the controller is further configured to: continue to determine if the concentration of the fire suppressant, within the compartment, deviates from the desired concentration of the fire suppressant, within the compartment; and continue to adjust flow of the fire suppressant if the concentration of the fire suppressant, within the compartment, deviates from the desired concentration of the fire suppressant, within the compartment. a sensor system locatable within the compartment, the sensor system including, at least, a first sensor and a second sensor, the first sensor configured to detect atmospheric substances within the compartment and the second sensor configured to detect only combustion products and/or fire within the compartment, wherein the first sensor is a photoelectric sensor configured to detect atmospheric substances by sensing a difference in obscuration level within the compartment due to existence of atmospheric substances and the second sensor is an ionization sensor configured to detect only combustion products and/or fire; at least one valve for regulating flow of a fire suppressant to the compartment; a controller configured to control flow of the fire suppressant, via the at least one valve, in response to input from the sensor system, the controller configured to provide instructions to discharge the fire suppressant if the first sensor detects atmospheric substances and the second sensor detects combustion products; and at least one suppressant sensor configured to determine concentration of the fire suppressant within the compartment, wherein the controller is operatively associated with the at least one suppressant sensor and the instructions to discharge the fire suppressant are determined, by the controller, based, at least in part, on the concentration of the fire suppressant within the compartment, wherein the controller is further configured to determine if the concentration of the fire suppressant, within the compartment, deviates from a desired concentration of the fire suppressant, within the compartment, wherein the controller is further configured to adjust flow of the fire suppressant if the concentration of the fire suppressant, within the compartment, deviates from the desired concentration of the fire suppressant, within the compartment, and wherein if the second sensor continues to detect combustion products and/or fire, the controller is further configured to: continue to determine if the concentration of the fire suppressant, within the compartment, deviates from the desired concentration of the fire suppressant, within the compartment; and continue to adjust flow of the fire suppressant if the concentration of the fire suppressant, within the compartment, deviates from the desired concentration of the fire suppressant, within the compartment.