Gravel pit (IMAGE) University of Utah Caption A case study to test the atmospheric model to determine the PM2.5 emission hotspot near a gravel pit operation. The Google Earth image in c) shows the gravel pit—corresponding to the grid cells with the highest correlations in b). Credit Lin et. al. (2023) Atm Enviro Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. Adaptations must be shared under the same terms. License CC BY-NC-SA 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.