Arctic Ice Cores Trace Early 1900s Arsenic to One Montana Copper Smelter That Exposed More Than Half of Americans
Nature World News | 11.11.2026 21:01
A single copper operation in southwestern Montana sent enough arsenic into the air a century ago to expose roughly 50.5 million Americans, about 55 percent of the U.S. population at the time, to levels associated with higher lung cancer risk, according to a study published Nov. 10 in Nature Sustainability. Another 600,000 Canadians, about 11 percent of that country's population, were also downwind.
