Work-Related Lung Disease (WoRLD) Surveillance System

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Silicosis: Respirable Quartz Exposures

Respirable quartz: Geometric mean exposures and percent exceeding designated occupational exposure limits by MSHA metal/nonmetal mine district and state, MSHA samples, 1979–2003

- indicates incalculable field.PEL - permissible exposure limitREL - recommended exposure limitGM - geometric meanmg/m3 - milligrams per cubic meter MSHA - Mine Safety and Health Administration

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 and methods.

Source: MSHA metal/nonmetal mine data.

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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)