Work-Related Lung Disease (WoRLD) Surveillance System

Home > Volume 1: Silicosis and Related Exposures > 2007F03-06b

Volume 1: Silicosis: Respirable Quartz Exposures

Figure 3-5b. Respirable quartz: Geometric mean exposures by major industry division, MSHA and OSHA samples, 1979–2003

PEL - permissible exposure limitREL - recommended exposure limitmg/m³ - milligrams per cubic meter OSHA - Occupational 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.

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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)