Respirable quartz: Geometric mean exposures in coal mining, MSHA inspector and mine operator samples, 1982–2003 |
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PEL - permissible exposure limitREL - recommended exposure limitmg/m3 - milligrams per cubic meterMRE - Mining Research EstablishmentMSHA - Mine Safety and Health Administration |
Note: The MSHA PEL is 2 mg/m3 MRE for respirable dust containing less than or equal to 5 percent quartz. The PEL is adjusted using the formula [(10 mg/m3 MRE) / (% quartz)] for respirable dust containing greater than 5 percent quartz. See appendices for source description, methods, and agents. |
Source: 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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