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Respirable coal mine dust: Geometric mean exposures by type of mine, MSHA inspector and mine operator samples, 1979-2003


PEL - permissible exposure limit    REL - recommended exposure limit    mg/m3 - milligrams per cubic meter    

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.

Reference Number: 2008-170

Date Posted: June 2008

Archived Version