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Many of the samples they took were also full of polychlorinated biphenyls, which are highly carcinogenic chemical compounds that were common before being banned in 2001.
Source: https://www.greenprophet.com/2023/09/antarctic-pollution-research-stations/
These threats to ecological health (include) toxicity of certain metals, polychlorinated biphenyls (PCBs), dioxins, pentachlorophenol, and trichloroethene (TCE), as well as radionuclides above background levels.”