There are a lot of former industrial sites in Michigan that need to be cleaned up. The pollution left behind in one town in the middle of Michigan is particularly bad. The Velsicol Chemical Company (known as Michigan Chemical up until 1976) produced a lot of toxic chemicals in St. Louis, Michigan. It operated from the 1930s up until the late 1970s, and it was responsible for the notorious PBB incident that contaminated people throughout the state. The amount of pollution left behind in this town