Figure 1 (IMAGE) Aarhus University Caption PFAS reaches the Arctic with air and sea currents from North America, Asia and Europe. PFAS can, among other things, cause damage to people's immune system. As polar bears and humans are at the top of the food chain in the Arctic, they can have concentrations of PFAS that are up to 30 million times higher than in plankton algae in the sea. Credit no Usage Restrictions no License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.