Fairbanks Alaska experiences fine particle pollution (from wood burning stoves) and very clam winter air conditions, causing the air to not mix and the particles to remain suspended in the -40 to -60F temperatures. Over time the concentrations can cause bad "pollution" conditions (been there, lived that). Again, it is fine particles suspended in the air and not so much from CO or other common city pollutions that we may imagine or think of initially. the air is bad, but in other ways... but still bad due to climatological conditions.
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