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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 OSHA region and state, OSHA samples, 1979-1999
Table showing Respirable quartz:  Geometric mean exposures and percent exceeding designated occupational exposure limits by OSHA region and state, OSHA samples, 1979-1999

- indicates incalcuable field
PEL - permissible exposure limitREL - recommended exposure limitGM - geometric mean

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 is 0.05mg/m3. See appendices for source description, methods, and agents.

Source:  Occupational Safety and Health Administration (OSHA) Integrated Management Information System.

Reference Number: 2002T03-20

Date Posted: May 2003

Most Recent Version:
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