Increase in PM2.5 pollution (IMAGE) University of California - Riverside Caption Change in PM2.5 surface concentration after 4 degrees C of warming. Black dots symbolize statistically significant changes. Credit James Gomez/UCR Usage Restrictions none License Original 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.