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Respirable quartz: Geometric mean exposures by major industry division, MSHA and OSHA samples, 1979-2003


PEL - permissible exposure limit    REL - recommended exposure limit    mg/m3 - milligrams per cubic meter MSHA - Mine Safety and Health Administration

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 metal/non

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

Reference Number: 2008-303

Date Posted: June 2008