That isn't fog you see, it's ice fog. Ice fog forms in urban areas when the temperature drops well below zero. Whatever moisture is in the air, be it exhaust from cars, breath from humans or simple humidity, freezes into tiny ice crystals that just float in the air. Visibility can drop to zero in no time and that's when things become dangerous. But here's the really cool thing about ice fog, if you simply look up in the sky, you can see all the way to the sun and sky like nothing is there. Now I never experienced temps like this when we lived in Anchorage, but I have been at around 30 below zero and believe me, it's just miserable. The body aches, the cold just finds a way indoors and simply breathing becomes difficult. Anyways, here's Fairbanks right now with a temperature of minus 52 degrees.