Did you know what causes arctic haze?

Arctic Haze

Arctic haze is a condition of reduced visibility encountered by aircraft flying over arctic regions. When viewed away from the sun it appears grayish-blue, looking into the sun it appears reddish-brown. It has no distinct upper and lower boundaries, and produces none of the optical phenomena that would be expected if it were composed of ice crystals. The haze is generally believed to be composed of industrial pollution that moved into the Arctic from lower latitudes.

Weather reconnaissance planes flying over the high Arctic first encountered reduced visibility due to arctic haze in the 1950s. In the 1970s people realized that the haze was seasonal. It peaks in the spring and is most severe when stable, high-pressure systems produce clear, calm weather. Much of the pollution originates over industrial regions in Eurasia. The haze often appears in distinct bands at different heights because the sources are at a varying distance from the Arctic and the warmer "dirty" air is forced upward over the dome of cold air that sits over the Arctic in winter.