Primate studies supported 40-year-old PCB ban

When the Environmental Protection Agency banned polychlorinated biphenyls — industrial compounds once used widely in coolants and electrical insulators — in April of 1979, they were relying on the results of studies in animals that linked PCBs to dire health consequences including cancer, problems with conception, disruption of the nutrients in maternal milk and reduced cognitive abilities in offspring. Much of that work was done studying monkeys at the Wisconsin National Primate Center, and UW–Madison findings informed reference levels for PCB contamination that still guide cleanup at sites around the United States.