Figure 2-6. Respirable coal mine dust: Geometric mean exposures by type of mine, MSHA inspector and mine operator samples, 1979–2003 |
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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: In coal mining, for respirable dust containing less than or equal to 5% quartz, the MSHA PEL is 2 mg/m3 MRE; for respirable dust containing greater than 5% quartz, the MSHA PEL is [(10 mg/m3 MRE) / (% quartz)]. The NIOSH REL of 1 mg/m3 MRE for respirabl |
Source: MSHA coal mine inspector and mine operator dust 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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