Colette Heald, Colorado State University (IMAGE) Colorado State University Caption Colette Heald, assistant professor of atmospheric science at Colorado State University, has discovered that the large number of tiny organic aerosols floating in the atmosphere -- emitted from tailpipes and trees alike -- share enough common characteristics as a group that scientists can generalize their makeup and how they change in the atmosphere. Credit Colorado State University 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.