Research into Atmospheric Sulfates (IMAGE) Georgia Institute of Technology Caption Georgia Tech researchers have found that the pH of atmospheric sulfate particles is lower than expected. Shown (l-r) are Georgia Tech graduate student Hongyu Guo, Professor Rodney Weber from the School of Earth & Atmospheric Sciences and Professor Armistead Russell from the School of Civil and Environmental Engineering. Credit Credit: Rob Felt, Georgia Tech 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.