Respirable quartz: Geometric mean exposures and percent exceeding designated occupational exposure limits by MSHA coal mine district and state, MSHA inspector and mine operator samples, 1982–1999 |
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- indicates incalcuable field
PEL - permissible exposure limitREL - recommended exposure limitGM - geometric mean |
Note: All geometric means are reported in MRE (Mining Research Establishment) equivalents. For coal mining, the MSHA PEL is [(10 mg/m3 MRE) / (% quartz)] for respirable dust containing greater than 5 percent quartz. The MSHA respirable coal mine quartz exposure data and the NIOSH REL for respirable quartz cannot be compared to each other because they are based on different sampling criteria. See appendices for source description, methods, and agents. |
Source: Mine Safety and Health Administration (MSHA) coal mine inspector and mine operator quartz 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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