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The environmental authority for the state of North Rhine-Westphalia, where Leverkusen is located, said Wednesday that the smoke contained dioxin, polychlorinated biphenyl and furan compounds.

Officials believe the polychlorinated biphenyl, or PCB, contamination was caused by electrical transformers that served the reactor site.

I grew up in New York in the 1960s hearing about massive Polychlorinated Biphenyl – a toxic chemical used as a coolant – contamination in the Hudson River and the threatened extinction of bald eagles and ospreys from eating contaminated fish.

In its review, the agency said that while polychlorinated biphenyl levels in fish remain high, more dredging doesn’t seem necessary for now.

Monsanto also addressed a long-running legal battle around polychlorinated biphenyl, or PCB, chemical compounds manufactured by its former corporate iteration that for decades were widely used in electrical wiring, caulking and other industrial functions but were found to be a major pollutant and raised health concerns.