Salt Lake County Schools (IMAGE) University of Utah Caption Locations of the 174 public schools included in the study and the PM 2.5 sensors. Credit Mullen et. al. Enviro Res (2020) Usage Restrictions Non commercial with attribution 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.