Clean Air (IMAGE) University of Iowa Caption University of Iowa researchers report Iowa's air falls within federal guidelines for fine pollutants, considered especially dangerous to human health. Credit Sondra Cue, University of Iowa 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.