• OSHA Rule to Reduce Worker Exposure to Respirable Crystalline Silica
  • Karen

    Karen D. Hamel CSP, CET, WACH, is a regulatory compliance professional, trainer and technical writer. She has more than 25 years of experience helping EHS professionals find solutions to meet EPA, OSHA and DOT regulations and has had more than 200 articles published on a variety of EHS topics. Karen is a Certified Safety Professional (CSP), Certified Environmental health and Safety Trainer (CET), Walkway Auditor Certificate Holder (WACH), OSHA-Authorized Outreach Trainer for General Industry, Community Emergency Response Team (CERT) trainer and hazmat technician. She serves on the Blair County, PA LEPC. Her specialties include a wide variety of environmental, safety, emergency response, risk management, DOT and NIMS topics. She conducts trainings and seminars at national conferences and webinars for several national organizations. For regulation or product information, we can be reached at 1-800-HOT-HOGS (468-4647) or by email at xtechnical@newpig.com.

  • Health and Safety Blogsays:
    12/16/2016 at 2:28 am Reply

    This was a very good example and it set things straight and in a good understanding way.

    • Brittanysays:
      12/20/2016 at 9:03 am Reply

      Thank you for the feedback!


  • Erik Hallsays:
    12/21/2016 at 3:30 pm Reply

    Curious why there isn’t a manufacturing category in this list?

    • Brittanysays:
      12/22/2016 at 11:56 am Reply

      Great question, Erik! Manufacturing falls under the general industry category.

  • Mariesays:
    01/03/2017 at 9:28 am Reply

    Maybe I missed it, but the particle size of concern is PM10 and less, correct?

    • Karensays:
      01/10/2017 at 6:32 pm Reply

      Hi Marie,

      In the final rule, OSHA did not include a particle size. Instead, they defined respirable crystalline silica as “quartz, cristobalite, and/or tridymite contained in airborne particles that are determined to be respirable by a sampling device designed to meet the characteristics for respirable-particle-size-selective samplers specified in the International Organization for Standardization (ISO) 7708:1995: Air Quality – Particle Size Fraction Definitions for Health-Related Sampling” [29 CFR 1910.1053(b)].

      The ISO Standard provides definitions for “respirable fractions” of airborne particles as well as charts to help industrial hygienists determine inhalation ratios. In practice, most monitoring devices that would be used to sample respirable dust levels (such as respirable cyclones) are capable of detecting particles in the 1 to 10 micron range.


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