The room air quality sensor AERASGARD® RLQ-UP is used to determine the air quality through qualitative evaluation of room air pollution by diverse gas fractions (e.g. cigarette smoke, exhaled breathing air, solvent vapours, etc.). Energy conservation is achieved by ventilation of rooms on an as-needed basis. This in-wall version was developed for users with highest demands in respect of design as these sensors are available in line with all current panel switch programmes, e.g. Busch-Jaeger, Berker, Gira, Feller, Gira, Legrand, Merten, Niko and Jung. The sensor's lifetime depends on the type of pollution and gas concentration.