A survey of pollution and other impurities in North American snow required researchers to find sites with undisturbed snow far from any city or major road – in other words, a recipe for getting stranded by the side of a cold, lonely road. During the campaign that went from late January to late March 2013, the group traveled some 9,600 miles. They sampled snow in 13 American states and three Canadian provinces, and got stuck only twice. Before leaving Seattle…
January 7, 2015