Gerald Markowitz and David Rosner point in their article (reference below): “Industrially produced chemicals have become an essential ingredient in virtually all of our lives. Our kitchens are filled with detergents; household sprays are made from a variety of solvents; our walls and floors are made of ‘vinyl’; our foods are packaged in wrappings made of clear plastics; our vegetables are grown with synthetic fertilizers and covered with pesticides; our computers, desks, and mechanical devices are filled with synthetic materials. It is not surprising that chemicals are in our bodies as well, where literally hundreds of chemicals have been identified”……” Scientists barely understand what long-term dangers these substances may present to human health and the environment. Some of these chemicals are especially worrisome“…….”Of special concern are a variety of chlorinated hydrocarbons, including DDT and other pesticides that were once spread freely………... Despite being banned decades ago, they have accumulated in the bones, brains, and fatty tissue of virtually all of us. Their close chemical carcinogenic cousins, polychlorinated biphenyls (PCBs), were found in innumerable household and consumer products—like carbonless copy paper, adhesives, paints, and electrical equipment—from the 1950s through the 1970s.”
 
The authors describe in their article the PCB story.
Monsanto, PCBs, and the creation of a "world-wide ecological problem" by Markowitz GRosner D in J Public Health Pol (2018) 39:463–540;