Dust and gasses that accumulate in concentrated animal feeding operations can pose a serious respiratory health risk to workers, yet research indicates that few wear protective masks on a regular basis. A better – and more cost-effective – way to reduce worker exposure may be to install a ventilation system to control contaminants in a facility, according to research led by Dr. T. Renee Anthony, assistant professor of occupational and environmental health in the University of Iowa College of Public Health.