Trends in August particulate matter in the Western U.S. (image) University of Utah Share Print E-Mail Caption Changes in daily average particulate matter in the month of August from 2000 to 2019. Points outlined in black indicate statistical significance. Credit Kai Wilmot Usage Restrictions Credit Kai Wilmot Share Print E-Mail 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.