"Pollutants in the Arctic are largely introduced from sources around the globe carried by air and ocean currents. Only a small amount of pollutants originate in the Arctic. A recognized problem facing some regions in the Arctic has been the impact of contaminants from heavy metals and Persistent Organic Pollutants that enter the Arctic by aquatic and air pathways from other places in the world. Arctic haze and black carbon (soot) are also growing concerns." (Quoted from article)