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Volume 1: Silicosis: Respirable Quartz Exposures

Table 3-16b. 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 limitGM - geometric meanmg/m³ - milligrams per cubic meterMSHA - 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. The NIOSH REL

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

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Page last modified: June 23, 2008
Page last reviewed: June 23, 2008
Content Source: National Institute for Occupational Safety and Health (NIOSH)