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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 limit    REL - recommended exposure limit    GM

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.

Reference Number: 2008-203

Date Posted: June 2008

Archived Version