Mountain West (CO ID MT NV UT WY)

In the past few years, there have been several instances in which disturbance of sites containing naturally-occurring asbestos, via construction or other land use changes, has posed a potential health threat. As one tool for reducing such problems, on March 13, 2008, USGS released its fourth in a series of reports on US sites with naturally-occurring asbestos, covering 121 locations in AZ, NV, and UT.