U of I researcher informs supervisors about frac-sand impact

Scientists have known for centuries crystalline silica is a carcinogen, according to Dr. Peter Thorne.
The head of the University of Iowa’s Department of Occupational and Environmental Health was in Decorah making a presentation at the Winneshiek County Board of Supervisors’ meeting last week. The University is currently conducting an Environmental Health Sciences Research Center (EHSRC) project on the impacts of proppant sand mining.