Coal Mine Dust Exposures and Associated Health Outcomes
Since its inception in 1970 the National Institute for Occupational Safety and Health (NIOSH) has extensively investigated and assessed coal miner morbidity and mortality. This history of research encompasses epidemiology; medical surveillance; laboratory-based toxicology, biochemistry, physiology, and pathology; exposure assessment; disease prevention approaches; and methods development. The experience gained in those activities, together with knowledge from external publications and reports, was brought together in 1995 in a major NIOSH review and report of recommendations, entitled Criteria for a Recommended Standard—Occupational Exposure to Respirable Coal Mine Dust. This document had the following major recommendations:
1. Exposures to respirable coal mine dust should be limited to 1 mg/m3 as a time-weighted average concentration for up to a 10 hour day during a 40 hour work week;
2. Exposures to respirable crystalline silica should be limited to 0.05 mg/m3 as a time-weighted average concentration for up to a 10 hour day during a 40 hour work week;
3. The periodic medical examination for coal miners should include spirometry;
4. Periodic medical examinations should include a standardized respiratory symptom questionnaire;
5. Surface coal miners should be added to and included in the periodic medical
monitoring.
