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Silicosis: Respirable Quartz Exposures

Respirable quartz: Geometric mean exposures and percent exceeding designated occupational exposure limits by major industry division, MSHA and OSHA samples, 1979-2003
Table showing Respirable quartz: Geometric mean exposures and percent exceeding designated occupational exposure limits by major industry division, MSHA and OSHA samples, 1979-2003

SIC - Standard Industrial ClassificationPEL - permissible exposure limitREL - recommended exposure limit

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. The NIOSH REL

Source:  MSHA metal/nonmetal mine data. OSHA Integrated Management Information System.

Reference Number: 2007T03-16b

Date Posted: June 2008

Archived Versions:
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