Expanded air sampling area (IMAGE) University of Utah Caption The difference between the upwind atmospheric area sampled by four current stationary air quality monitors (left) compared with the area sampled by a train-based mobile sensor. Credit University of Utah Usage Restrictions Credit University of Utah License Licensed 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.