Pollution and Trees (IMAGE) USDA Forest Service - Northern Research Station Caption A new study by Forest Service scientists and colleagues finds that trees play an important role in reducing fine particulate air pollution. Credit US Forest Service 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.