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Epidemiological studies have found that diesel exhaust presents health risks to workers. These possible health effects range from headaches and nausea to respiratory disease and cancer. MSHA's existing regulations address the health hazards to underground metal and nonmetal miners (66 FR 5706) and coal miners (66 FR 5526) from exposure to diesel particulate matter (DPM). DPM is a component of diesel exhaust. MSHA also has limits for miners’ occupational exposure to selected components of the gaseous fraction of diesel exhaust. In June 2012, the International Agency for Research on Cancer classified diesel exhaust as a known human carcinogen. The National Institute for Occupational Safety and Health and the National Cancer Institute also have stated that diesel exhaust exposure has important public health implications, including increasing the risk of death from lung cancer. Because of the carcinogenic health risk to miners from exposure to diesel exhaust, MSHA is requesting information on approaches that would improve control of DPM and diesel exhaust.