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In page Hudson River:
"Industrial contamination of the Hudson River grew sharply in the mid-twentienth century, particularly from polychlorinated biphenyls, or PCBs. Pollution control regulations, enforcement actions, and restoration projects initiated in the late twentieth and twenty-first centuries have begun to improve water quality.[5][6] Sturgeon have been seen in the Hudson and whales in the New York Bay in the early twenty-first century.[citation needed]
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