University of Iowa study finds wildfires have worsened ozone pollution across the U.S.

Our air was getting cleaner. Now, wildfire smoke has reversed that progress. On this episode, a new University of Iowa study finds wildfires have undone years of gains against ground-level ozone pollution, and the effects are reaching deep into the Midwest. First, we hear from former Iowa residents Jerry and Sue Prothero, who watched ash fall like snow in northern Minnesota. Then, we talk with Jun Wang, the study's lead author, about why ozone pollution is worsening and what it means for Iowans. We also talk with Peter Thorne of the University of Iowa College of Public Health about the...