Work-Related Lung Disease Surveillance System (eWoRLD)
Silicosis: Respirable Quartz Exposures (Archive)
Respirable quartz: Geometric mean exposures and percent exceeding designated occupational exposure limits by MSHA metal/nonmetal mine district and state, MSHA samples, 1979-1999
- indicates incalcuable field
PEL - permissible exposure limitREL - recommended exposure limitGM - geometric mean
Note: For metal/nonmetal mining, the MSHA PEL is [(10 mg/m3) / (% quartz+2)] for respirable dust containing at least 1 percent quartz. The NIOSH REL is 0.05 mg/m3. See appendices for source description, methods, and agents.
Source: Mine Safety and Health Administration (MSHA) metal/nonmetal mine data.
Reference Number: 2002T03-19
Date Posted: May 2003
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