Research from Colette Heald, Associate Professor and Associate Department Head of CEE, research scientist David Ridley and Professor Jesse Kroll, shows that the Clean Air Act saved more lives than initially estimated by the U.S. Environmental Protection Agency. The researchers studied observations of organic aerosol across the United States and showed a significant decrease from 1990 to 2012. The paper was published in Proceedings of the National Academy of Sciences. Read more on MIT News.