Electron micrograph images of pine needles in air pollution (image) University of Utah Share Print E-Mail Caption Scanning electron photomicrographs of evergreen needle surfaces. Images from each location are shown both during non-inversion (left) and inversion (right). Credit University of Utah Usage Restrictions Credit as indicated Share Print E-Mail 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.