Persistent Organic Pollutants
POPs are hazardous chemicals which have distinctive and very dangerous properties. POPs persist in the environment for a long time; they can travel long distances through the air or sea; and they are ‘bioaccumulative’. This means that they build up in living organisms, mainly in fatty tissue, and their concentration increases as they rise through each level of a food chain – and so the highest concentrations are normally found in the top predators like humans and polar-bears.