On Friday, February 29, 2008, the Mine Safety and Health Administration published in the Federal Register, as a separate Part IV, revisions to its existing health standards for asbestos exposure at metal and nonmetal mines, surface coal mines, and surface areas of underground coal mines. This final rule reduces the permissible exposure limits for airborne asbestos fibers.
http://www.msha.gov/REGS/FEDREG/FINAL/2008finl/E8-3828.pdf
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