Researchers find little-known PCB 'pretty much everywhere'

摘要

After a half-century of use in products ranging from electrical transformers to caulk to paint, PCBs were banned in the late 1970s as one of the "dirty dozen" persistent organic pollutants. But a little-known PCB is turning up in water and air in cities and watersheds in Illinois, Nova Scotia, and New Jersey. Researchers suspect the chemical is even more widespread, but do not know how-or whether-it affects human health or ecosystems.