Clouds Showing Effects of Pollution (IMAGE) The Hebrew University of Jerusalem Caption Smoke from agricultural fires suppresses rainfall from a cloud over the Amazon (right). A similar size cloud (left) rains heavily on the same day some distance away in the pristine air. Credit Hebrew University photo 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.