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: 2007F02-07
Date Posted: June 2008