Method for quality monitoring and detection of contamination of a space, wherein the space is a volume which is determinable by space coordinates and which is substantially filled with a fluid, comprising the method steps: a) measuring a plurality of quality parameter actual values in a space by means of a sensor system, wherein the space is a volume determinable by space coordinates and is substantially filled with a fluid, wherein the actual value of at least one quality parameter is measured at a plurality of measuring locations, wherein the sensor system comprises a number of stationary sensors and a number of mobile sensors, wherein at least one sensor is a stationary sensor and at least one sensor is a mobile sensor, wherein each sensor measures the at least one quality parameter actual value at a position of the measuring location determined by means of space coordinates; b) transmitting the quality parameter actual values measured at a plurality of measuring locations to a data processing system; c) comparing the quality parameter actual values measured at the respective measuring locations with target values stored in the data processing system for the respective measuring locations; d) moving the at least one mobile sensor by means of a control system to a measuring location spaced from the previous measuring location of the at least one mobile sensor, wherein the at least one mobile sensor approaches controllably different measuring locations according to a movement plan stored in the data processing system, characterized in that , in the event of a fault in which at least one actual value deviates from the target value defined for the respective measuring location, at least one mobile sensor is moved by the control system in a manner deviating from the stored movement plan and measures additional quality parameter actual values at additional measuring locations in the space around the position of the measuring location with the detected actual value deviation and transmits them to the data processing system, wherein the data processing system determines the spatial propagation, the type of contamination and/or the concentration of the respective contamination of the space. a) measuring a plurality of quality parameter actual values in a space by means of a sensor system, wherein the space is a volume determinable by space coordinates and is substantially filled with a fluid, wherein the actual value of at least one quality parameter is measured at a plurality of measuring locations, wherein the sensor system comprises a number of stationary sensors and a number of mobile sensors, wherein at least one sensor is a stationary sensor and at least one sensor is a mobile sensor, wherein each sensor measures the at least one quality parameter actual value at a position of the measuring location determined by means of space coordinates; b) transmitting the quality parameter actual values measured at a plurality of measuring locations to a data processing system; c) comparing the quality parameter actual values measured at the respective measuring locations with target values stored in the data processing system for the respective measuring locations; d) moving the at least one mobile sensor by means of a control system to a measuring location spaced from the previous measuring location of the at least one mobile sensor, <EOS>