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OSHA regulations for occupational exposures to crystalline silica are addressed in specific standards for general industry, shipyard employment, and the construction industry.

General Industry (29 CFR 1910)

Shipyard Employment (29 CFR 1915)

Construction Industry (29 CFR 1926)

  • 1926.55, Gases, vapors, fumes, dusts, and mists
    • Appendix A, Gases, vapors, fumes, dusts, and mists
  • 1926.57, Ventilation

State Standards

There are twenty-eight OSHA-approved State Plans, operating state-wide occupational safety and health programs. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or more stringent requirements.

  • National Emphasis Program – Crystalline Silica. OSHA Directive CPL 03-00-007, (2008, January 24). Includes an updated list of industries commonly known to have overexposures to silica; detailed information on potential hazards linked to silica and about current research regarding silica exposure hazards; guidance on calculating the Permissible Exposure Limits (PELs) for dust containing respirable crystalline silica in the construction and maritime industries; and guidance on conducting silica-related inspections.
  • Search all available directives.
Standard Interpretations

*Accessibility Assistance: Contact OSHA's Directorate of Standards and Guidance at (202) 693-1999 for assistance accessing PDF materials.

All other documents, that are not PDF materials or formatted for the web, are available as Microsoft Office® formats and videos and are noted accordingly. If additional assistance is needed with reading, reviewing or accessing these documents or any figures and illustrations, please also contact OSHA's Directorate of Standards and Guidance at (202) 693-1999.

**eBooks - EPUB is the most common format for e-Books. If you use a Sony Reader, a Nook, or an iPad you can download the EPUB file format. If you use a Kindle, you can download the MOBI file format.

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