Pneumoconiotic agents: Percent of exposures exceeding the NIOSH recommended exposure limits by major industry division, MSHA inspector and mine operator and OSHA samples, 1979-2003
REL - recommended exposure limit PEL - permissible exposure limit MSHA - Mine Safety and Health Administration
Note: From March 1, 1989 to March 22, 1993, the OSHA PELs in force differed from those employed before and after those dates. The NIOSH REL for respirable coal mine dust of 1.0 mg/m3 was adopted in September 1995. The MSHA respirable coal mine quartz exposure
Source: MSHA metal/nonmetal mine and coal mine inspector and mine operator dust and quartz data. OSHA Integrated Management Information System.
Reference Number: 2008-322
Date Posted: June 2008