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Contact: Mary Beckman
DOE/Pacific Northwest National Laboratory
Caption: When soot from pollution settles on pristine snow, it can increase snowmelt in the winter month of February (top left, red) and decrease it in the late spring (May -- bottom right, blue).
Credit: Pacific Northwest National Laboratory
Usage Restrictions: Credit PNNL
Related news release: Dirty snow causes early runoff in Cascades, Rockies