NIOSH Docket Number 174
Coal Dust Particle Size Surveys
The National Institute for Occupational Safety and Health (NIOSH) and MSHA conducted a joint survey to determine the range of coal particle sizes found in dust samples collected from intake and return airways of U.S. coal mines. Results from this survey show that the coal dust found in mines today is much finer than in mines of the 1920s, presumably due to increased automation and a greater reliance on mining machinery.
Given the results of the recent coal dust particle size survey and large-scale explosion tests, NIOSH recommends a new standard of 80% total incombustible content be required in the intake airways of bituminous coal mines.
NIOSH responses to comments received on document; 5/1/10 [PDF - 8,721 KB]
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