WASHINGTON: The head of the U.S. federal agency in charge of mine safety said on Thursday he has no plans to fast-track new limits for coal miner exposure to silica dust because he believes exposure rates are already falling.
Government research and reports from black lung disease clinics in West Virginia, Virginia and Kentucky show the incidence of black lung rebounding despite improved safety measures adopted decades ago that had almost eradicated the progressive respiratory disease. In 2016, MSHA put out a standard to reduce respirable coal dust but did not set any limits for exposure to silica, which is finer and more dangerous to miners' lungs.The Occupational Safety and Health Administration, which regulates a slew of industries but not mines, set a new silica standard that same year, cutting the permissible exposure limit to half of what it used to be, but MSHA did not follow suit.
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