A cabin air control system for an aircraft, comprising - a plurality of compressed air sources (4a, 4b, 5, 6), each operable to provide compressed air, - at least one air outlet, - a conduit system connected to the plurality of compressed air sources (4a, 4b, 5, 6) and to the at least one air outlet and arranged to conduct air from the plurality of compressed air sources (4a, 4b, 5, 6) in a downstream direction to the at least one air outlet, and - a plurality of particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') adapted to detect the presence of particulate matter in air from the plurality of compressed air sources (4a, 4b, 5, 6), wherein each of the particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') is associated with a different predefined subset (4a; 4b, 5, 6) of the compressed air sources (4a, 4b, 5, 6) by being arranged in the conduit system at a location from which it is only possible to reach the associated subset (4a; 4b, 5, 6) of the compressed air sources (4a, 4b, 5, 6) when traversing the conduit system from the respective location towards the plurality of compressed air sources (4a, 4b, 5, 6) in an upstream direction, wherein any two subsets (4a; 4b, 5, 6) of the different subsets (4a; 4b, 5, 6) associated with the different particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') include different ones of the compressed air sources (4a, 4b, 5, 6), characterized in that further comprising at least one sensor (23a, 23b, 23c, 23a', 23b'), each arranged and adapted to sense at least one predetermined chemical compound in air from the compressed air sources (4a, 4b, 5, 6), further comprising an evaluation unit coupled to each of the particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') and adapted to receive from each of the particulate matter detectors a respective detection signal indicative of a presence of particulate matter as detected by the respective particulate matter detector, wherein the evaluation unit is adapted to evaluate the detection signals to determine whether one of the particulate matter detectors has detected a presence of particulate matter, and to indicate, upon determining that one of the particulate matter detectors has detected a presence of particulate matter, the subset of compressed air sources (4a, 4b, 5, 6) associated with the respective particulate matter detector, wherein the evaluation unit is further coupled to each of the at least one sensor (23a, 23b, 23c, 23a', 23b') and is adapted to receive from each of the at least one sensor (23a, 23b, 23c, 23a', 23b') a respective sensor signal indicative of a presence of the respective at least one predetermined chemical compound as sensed by the respective sensor (23a, 23b, 23c, 23a', 23b'), wherein the evaluation unit is adapted to evaluate the sensor signals to determine whether one of the at least one sensor (23a, 23b, 23c, 23a', 23b') has sensed a presence of the respective at least one chemical compound, and wherein the evaluation unit is adapted to operate the at least one sensor (23a, 23b, 23c, 23a', 23b') only upon determining that one of the particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') has detected a presence of particulate matter. - a plurality of compressed air sources (4a, 4b, 5, 6), each operable to provide compressed air, - at least one air outlet, - a conduit system connected to the plurality of compressed air sources (4a, 4b, 5, 6) and to the at least one air outlet and arranged to conduct air from the plurality of compressed air sources (4a, 4b, 5, 6) in a downstream direction to the at least one air outlet, and - a plurality of particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') adapted to detect the presence of particulate matter in air from the plurality of compressed air sources (4a, 4b, 5, 6), further comprising at least one sensor (23a, 23b, 23c, 23a', 23b'), each arranged and adapted to sense at least one predetermined chemical compound in air from the compressed air sources (4a, 4b, 5, 6), further comprising an evaluation unit coupled to each of the particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') and adapted to receive from each of the particulate matter detectors a respective detection signal indicative of a presence of particulate matter as detected by the respective particulate matter detector, wherein the evaluation unit is adapted to evaluate the detection signals to determine whether one of the particulate matter detectors has detected a presence of particulate matter, and to indicate, upon determining that one of the particulate matter detectors has detected a presence of particulate matter, the subset of compressed air sources (4a, 4b, 5, 6) associated with the respective particulate matter detector, wherein the evaluation unit is further coupled to each of the at least one sensor (23a, 23b, 23c, 23a', 23b') and is adapted to receive from each of the at least one sensor (23a, 23b, 23c, 23a', 23b') a respective sensor signal indicative of a presence of the respective at least one predetermined chemical compound as sensed by the respective sensor (23a, 23b, 23c, 23a', 23b'), wherein the evaluation unit is adapted to evaluate the sensor signals to determine whether one of the at least one sensor (23a, 23b, 23c, 23a', 23b') has sensed a presence of the respective at least one chemical compound, and wherein the evaluation unit is adapted to operate the at least one sensor (23a, 23b, 23c, 23a', 23b') only upon determining that one of the particulate matter detectors (21a, 21b, 21c, 21d, 21a', 21b') has detected a presence of particulate matter.