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Asbestos fibers: Barking up a tree

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1:55pm, July 11, 2006

In Libby, Mont., mining of asbestos-contaminated vermiculite—a natural insulating material—sickened or killed many workers and townspeople in recent decades. Now, a study finds that even 16 years after the vermiculite mine closed, area trees hold substantial amounts of asbestos, rendering them hazardous to a separate group of workers.

Logging is a major employer for people around Libby. With asbestos a potential contaminant in dust, Tony J. Ward of the University of Montana in Missoula and his colleagues wondered whether asbestos from the mining operations might have settled on local trees.

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