Zombie fires have been smoldering under layers of snow in as the remnants of last year's massive wildfires remain in the area. The zombie fires, or flameless, slow-burning fires that occur under the earth's surface, have triggered fears that the thaw will bring another smog-filled summer to the US. Firefighter and scientist Sonja Leverkus said that as she drove in a snowstorm in November in her small town in British Columbia, she noticed that instead of the snow being white, it was a blue-grey color from the smoke.
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