A pollutant is present at “dangerously high levels” in Europe’s killer whales and dolphins, scientists say.

PCBs were once used in electrical gear, paints and flame retardants, but were banned from the 1970s because of their toxic effect in humans and animals.

However the manmade chemicals have persisted in the environment, and are accumulating in top predators.

The study finds Europe’s cetaceans have levels of PCBs that are among the highest found in on the oceans.

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