The AirSentry II family of ion mobility spectrometers for airborne molecular contamination (AMC) detect and alert users to small concentrations or changes in airborne levels of chlorides, acids, amines and ammonia-containing species. With parts-per-trillion (ppt) sensitivity, these point-of-use sensors provide fast response, increased detection selectivity and repeatable performance. Combining Air Sentry II sensors with a central software platform allows for easy data acquisition and analysis. The AirSentry II family of airborne molecular contamination sensors provide continuous actionable data, to enable efficient response to contamination sources and events.