We all know air pollution is a health risk. We have invested billions of dollars in the U.S. trying to clean up the problem. But there are still a lot of unanswered questions about exactly what diseases and health conditions are caused by breathing polluted air. On this edition of UWM Today, we meet a public health expert who has just received a multi-million dollar grant from the federal government to try to come up with answers. Amy Kalkbrenner is an associate professor of Environmental Health