There has been little specific testing done on the numerous kinds of PCB’s and how they differ. PCB’s (Polychlorionated Biphenyls) “are always listed among the most harmful substances,” accdording to the American government. Even trace amounts can be harmful and extremely toxic.
PCB’s are no longer manufactured in the United States, because of their extreme toxicity. They have not been made since 1977. However, contamination still exists from deposits in the environment.
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