Respirable quartz: Geometric mean metal/nonmetal mining exposures by state, MSHA samples, 1979–1999 |
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PEL - permissible exposure limitREL - recommended exposure limitmg/m3 - milligrams per cubic meter |
Note: For metal/nonmetal mining, the MSHA PEL is [(10 mg/m3) / (% quartz+2)] for respirable dust containing at least 1 percent quartz. The NIOSH REL is 0.05 mg/m3. See appendices for source description, methods, and agents. |
Source: Mine Safety and Health Administration (MSHA) metal/nonmetal mine data. |
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Page last modified: June 23, 2008
Page last reviewed: June 23, 2008
Content Source: National Institute for Occupational Safety and Health (NIOSH)
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