The invention relates to an air-conditioning device comprising a control unit and a sensor device, which can be used to detect the presence of an analyte in the room air, on the basis of which the quality of the room air can be concluded. The sensor device is equipped with a light source which emits light on a light path into the room and a detector sensitive to the light. The control unit controls the air-conditioning device depending on the output signal of the detector. If the analyte is located on the light path, the light is scattered and/or absorbed such that the detector detects a lower quantity of light, on the basis of which the presence of the analyte can be concluded. The light source can be pivoted such that differing light paths through the room can be set. To this end, for each light path the output signal of the detector is determined such that it can be ascertained where in the room the analyte is located, and the air-conditioning device can deliberately locally influence the climate.