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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
Table showing 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

Most Recent Version:
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