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The rule establishes a permissible exposure limit (PEL) of respirable crystalline silica at 50 micrograms per cubic meter (8-hour TWA) and an action level of 25 mg/m3 (8-hour TWA), with requirements covering exposure sampling, compliance methods, corrective actions, respiratory protection, medical surveillance for metal and nonmetal mines, and recordkeeping.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/lowering-miners-exposure-to-respirable-crystalline-silica-and-improving-respiratory-protection/328350/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/lowering-miners-exposure-to-respirable-crystalline-silica-and-improving-respiratory-protection/328350.png","ImageObject",300,407,{"name":92,"@type":93},"Chumphorn","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-27","2026-09-21",true,{"@type":102,"interactionType":103,"userInteractionCount":39},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the main purpose of MSHA’s final rule on respirable crystalline silica?","Question",{"text":112,"@type":113},"The rule aims to reduce occupational disease in miners and improve respiratory protection against airborne contaminants. It does so by setting exposure limits and related compliance requirements.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"What exposure limits does the final rule set for respirable crystalline silica?",{"text":117,"@type":113},"The final rule sets a permissible exposure limit (PEL) of 50 micrograms per cubic meter for a full-shift, calculated as an 8-hour time-weighted average. It also establishes an action level of 25 mg/m3 for a full-shift, calculated as an 8-hour TWA.",{"name":119,"@type":110,"acceptedAnswer":120},"What compliance actions and health protections are included in the final rule?",{"text":121,"@type":113},"The final rule includes requirements for exposure monitoring and sampling, corrective actions when exposure exceeds the permissible exposure limit, respiratory protection, medical surveillance for metal and nonmetal mines, and recordkeeping.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},328350,1790829478,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":39,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},2336475401981,"https://ap-avatar.wpscdn.com/avatar/22000c94efd8d5204d?x-image-process=image/resize,m_fixed,w_180,h_180&k=1786935347598174694","DEPARTMENT OF LABOR  \nMine Safety and Health Administration  \n30 CFR Parts 56, 57, 60, 70, 71, 72, 75, and 90  \n[Docket No. MSHA–2023–0001] RIN 1219–AB36  \nLowering Miners’ Exposure to Respirable Crystalline Silica and Improving Respiratory Protection  \nAGENCY: Mine Safety and Health Administration (MSHA), Department of Labor.  \nACTION: Final rule.  \nSUMMARY: The Mine Safety and Health Administration (MSHA) is amending its existing standards to better protect miners against occupational exposure torespirable crystalline silica, a significant health hazard, and to improve respiratory protection for miners from exposure to airborne contaminants. MSHA’s final rule also includes other requirements to protect miner health, such as exposure sampling, corrective actions to be taken when a miner’s exposure exceeds the permissible  \nexposure limit, and medical surveillance for metal and nonmetal mines.  \nDATES:  \nEffective date: The final rule is effective June 17, 2024, except for amendments 21, 22, 25, 26, 27, 30, 31, 34, 35, 36, 38, 39, 42, 43, 46, 47, 50, 51, 54, 55, 59, 60, 63, 64, 68, 69, 73, 74, 77, 78, 81, 82, 83, 86, 87, 90, 91, 94, 95, 98, 99, 102, 103, 106, 107, 110, and 111, which are effective April 14, 2025, and amendments 4, 5, 8, 9, 13, 14, 17, and 18, which are effective April 8, 2026.  \nIncorporation by reference date: The incorporation by reference of certain materials listed in the rule is approved by the Director of the Federal Register beginning June 17, 2024, except for the material in amendment 60, which is approved beginning April 14, 2025, and the material in amendments 9 and 18, which is approved beginning April 8, 2026. The incorporation by reference of certain other material listed in the rule was approved by the Director of the Federal Register as of July 10, 1995.  \nCompliance dates: Compliance with this final rule is required April 14, 2025 for coal mine operators and April 8, 2026 for metal and nonmetal mine operators.  \nFOR FURTHER INFORMATION CONTACT: S. Aromie Noe, Director, Office of Standards, Regulations, and Variances, MSHA, at: [silicaquestions@dol.gov](silicaquestions@dol.gov)  \n(email); 202–693–9440 (voice); or 202– 693–9441 (facsimile) . These are not tollfree numbers.  \nSUPPLEMENTARY INFORMATION:  \nThe preamble to the final standard follows this outline:  \nI. Executive Summary  \nII. Pertinent Legal Authority  \nIII. Regulatory History  \nIV. Background  \nV. Health Effects Summary  \nVI. Final Risk Analysis Summary  \nVII. Feasibility  \nVIII. Summary and Explanation of the Final Rule  \nIX. Summary of Final Regulatory Impact Analysis and Regulatory Alternatives  \nX. Final Regulatory Flexibility Analysis  \nXI. Paperwork Reduction Act  \nXII. Other Regulatory Considerations  \nXIII. References  \nXIV. Appendix  \nAcronyms and Abbreviations  \nCOPD chronic obstructive pulmonary disease  \nESRD end-stage renal disease FEV forced expiratory volume FRA final risk analysis  \nFRIA final regulatory impact analysis FVC forced vital capacity  \nL/min liters per minute mg milligram  \nmg/m3 milligrams per cubic meter mL milliliter  \nmg/m3 micrograms per cubic meter MNM metal and nonmetal  \nMRE Mining Research Establishment NMRD nonmalignant respiratory disease  \nPEL permissible exposure limit PMF progressive massive fibrosis PRA preliminary risk analysis RCMD respirable coal mine dust REL recommended exposure limit SiO2 silica  \nTB tuberculosis  \nTLV® Threshold Limit Value TWA time-weighted average  \nI. Executive Summary  \nA. Purpose of the Regulatory Action  \nThe purpose of this final rule is to reduce occupational disease in miners and to improve respiratory protection against airborne contaminants. The rule sets the permissible exposure limit (PEL) of respirable crystalline silica at 50 micrograms per cubic meter of air (mg/m3 ) for a full-shift exposure, calculated as an 8-hour time weighted average (TWA) for all mines. This rule also establishes an action level forrespirable crystalline silica of 25 mg/m3 for a ","cbCairXnPjkBcOnk","https://ap.wps.com/l/cbCairXnPjkBcOnk","pdf",12093983,268,"English","# Executive Summary\n## Purpose of the Regulatory Action\n## Health and Risk Overview\n# Pertinent Legal Authority\n# Regulatory History and Background\n# Health Effects Summary\n# Final Risk Analysis Summary\n# Feasibility\n# Summary and Explanation of the Final Rule\n# Final Regulatory Impact Analysis and Regulatory Alternatives\n# Final Regulatory Flexibility Analysis\n# Paperwork Reduction Act\n# Other Regulatory Considerations\n# References and Appendix","[{\"question\":\"What is the main purpose of MSHA’s final rule on respirable crystalline silica?\",\"answer\":\"The rule aims to reduce occupational disease in miners and improve respiratory protection against airborne contaminants. It does so by setting exposure limits and related compliance requirements.\"},{\"question\":\"What exposure limits does the final rule set for respirable crystalline silica?\",\"answer\":\"The final rule sets a permissible exposure limit (PEL) of 50 micrograms per cubic meter for a full-shift, calculated as an 8-hour time-weighted average. It also establishes an action level of 25 mg/m3 for a full-shift, calculated as an 8-hour TWA.\"},{\"question\":\"What compliance actions and health protections are included in the final rule?\",\"answer\":\"The final rule includes requirements for exposure monitoring and sampling, corrective actions when exposure exceeds the permissible exposure limit, respiratory protection, medical surveillance for metal and nonmetal mines, and recordkeeping.\"}]","Lowering Miners’ Exposure to Respirable Crystalline Silica and Improving Respiratory Protection | PDF",1789979427,675]