Average PM2.5 from smoke, 2006 to 2018 (IMAGE) American Geophysical Union Caption While states in the Western U.S. have higher concentrations of PM2.5 pollution from smoke, more people in the Eastern U.S. go to emergency rooms due to smoke-related illness, according to a new study in GeoHealth. Credit O'Dell et al. (2021)/GeoHealth Usage Restrictions None 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.