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Pneumoconiotic agents: Percent of exposures exceeding designated occupational exposure limits by MSHA coal mine district and states, MSHA inspector and mine operator samples, 1979-2003


- indicates incalculable field.    PEL - permissible exposure limit    REL - recommended exposure limit    MSHA

Note: The NIOSH REL for respirable coal mine dust of 1.0 mg/m3 was adopted in September 1995. The MSHA respirable coal mine quartz exposure data and the NIOSH REL for respirable quartz cannot be compared to each other because they are based on different sampli

Source: MSHA coal mine inspector and mine operator dust and quartz data.

Reference Number: 2008-504

Date Posted: June 2008

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