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


- indicates incalculable field.    SIC - Standard Industrial Classification    PEL - permissible exposure limitNote: The NIOSH REL for respirable coal mine dust of 1.0 mg/m3 was adopted in September 1995. The MSHA coal mine quartz exposure data cannot be compared to the NIOSH REL because they are based on different sampling criteria. See appendices for source descript

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

Reference Number: 2008-323

Date Posted: June 2008