Water-resistant gas sensor (IMAGE) Penn State Caption A new water-resistant gas sensor can be worn under the nose to detect nitrogen dioxide in the breath, the concentration of which may indicate potential pulmonary diseases. Credit Li Yang Usage Restrictions Educational use only License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.