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Respiratory Protection

A respirator is a protective facepiece, hood, or helmet that is designed to protect the wearer against a variety of harmful airborne agents. Asbestos exposure requires specific respiratory protection, depending on the concentration of asbestos in the air, as follows:

  • Asbestos concentrations less than or equal to 1 f/cm3 require a half-mask, air-purifying respirator other than a disposable respirator. The respirator must be equipped with high-efficiency filters.
  • Asbestos concentrations less than or equal to 5 f/cm3 require a full-facepiece, air-purifying respirator equipped with high-efficiency filters.
  • Asbestos concentrations less than or equal to 10 f/cm3 require any powered air-purifying respirator equipped with high-efficiency filters, or any supplied air respirator operated in continuous-flow mode.
  • Asbestos concentrations less than or equal to 100 f/cm3 require a full-facepiece, supplied air respirator operated in pressure-demand mode.
  • Asbestos concentrations greater than 1,000 f/cm3 require a full-facepiece, supplied air respirator operated in pressure-demand mode and equipped with an auxiliary, positive-pressure self-contained breathing apparatus.

To learn more about Asbestos Awareness visit our Cal/OSHA Asbestos Awareness Online Training web page.

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