PCBs may threaten killer whale populations for 30-60 years

Orcas or killer whales may continue to suffer the effects of contamination with polychlorinated biphenyls (PCBs) for the next 30 – 60 years, despite 1970s-era regulations that have reduced overall PCB concentrations in the environment, researchers in Canada report.

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<p><a href="http://www.physorg.com/news108638705.html">PCBs may threaten killer whale populations for 30-60 years</a></p> <p>Orcas or killer whales may continue to suffer the effects of contamination with polychlorinated biphenyls (PCBs) for the next 30 – 60 years, despite 1970s-era regulations that have reduced overall PCB concentrations in the environment, researchers in Canada report.</p>