Editor’s note: This article is adapted from a version published by the Center for Transportation Studies on October 8, 2025. After a big rainstorm has sent water rushing down the street, you may have noticed the oily sheen left behind. Unfortunately, this everyday scene—caused by contaminants such as metals and fossil fuels that collect on road surfaces—is a major source of water pollution in Minnesota. But new research from the University of Minnesota Duluth’s Natural Resources...
