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Sensor array measurements of acetone (a), ammonia (b), isoprene (c), RH (d), and CO2 (e) concentrations of five volunteers as a function of entrapment time. Skin only (0–60 min) followed by skin and breath (60–120 min) emissions were studied separately. In the case of volunteer no. 4 (circles), skin (only) emissions lasted accidentally for 80 min. Room air (background) concentrations are indicated in gray.
