The levels of long-lasting toxins known as “forever chemicals” rose in a highly protected marine area after sewage discharges, researchers found.

The University of Portsmouth teamed up with the Marine Conservation Society (MSC) to test for PFA chemicals in Langstone Harbour, Hampshire, which is home to harbour seals and a diverse range of birds.

Called “forever chemicals” because they can take centuries to break down in the environment, PFAs can accumulate in the bodies of living organisms and have been linked to severe health conditions.