Nitrogen Dioxide Pollution, Averaged Yearly From 2005-2011 (image) NASA/Goddard Space Flight Center Share Print E-Mail Caption Nitrogen dioxide pollution, averaged yearly from 2005-2011, has decreased across the United States. Credit NASA Goddard's Scientific Visualization Studio/T. Schindler Usage Restrictions None 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.