Respirable quartz: Number of samples, geometric mean exposures, and percent exceeding designated occupational exposure limits by industry, MSHA inspector and mine operator and OSHA samples, 1993-2003
CIC - Census Industry Code PEL - permissible exposure limit REL - recommended exposure limit GM - ge
Note: Before March 1, 1989 and after March 22, 1993, the OSHA PEL is [(10 mg/m3) /(% quartz + 2)], for respirable dust containing at least 1 percent quartz. From March 1, 1989 to March 22, 1993, the OSHA PEL was 0.1 mg/m3 for respirable quartz. For coal minin
Source: MSHA metal/nonmetal and coal mine inspector and mine operator quartz data. OSHA Integrated Management Information System.
Reference Number: 2007T03-17
Date Posted: June 2008