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Evaluating Exposure

Determinations of employee exposure shall be made from breathing zone air samples that are representative of the 8-hour TWA and 30-minute short-term exposures of each employee.

Medical surveillance

Medical surveillance guidance is provided in the following appendices to the OSHA Standards:

Exposure monitoring

Exposure monitoring samples must be analyzed by Phase Contrast Microscopy (PCM) for OSHA purposes. PCM methods accurately assess fiber exposure levels, but PCM can not differentiate between asbestos and non-asbestos fibers. Transmission Electron Microscopy (TEM) methods may be used to identify fibers, but may not be used to quantify air concentrations for occupational exposure.

Bulk sample analysis

Bulk sample analysis should be done by Polarized Light Microscopy (PLM). Bulk analysis results will likely apply to both OSHA and EPA regulations.

Controlling Exposure

Controlling the exposure to asbestos can be done through engineering controls, administrative actions, and personal protective equipment (PPE). Engineering controls include such things as isolating the source and using ventilation systems. Administrative actions include limiting the workers exposure time and providing showers. Personal protective equipment include wearing the proper respiratory protection and clothing. The following resources contain information to help control asbestos exposures.

Automotive

Precautions to prevent exposure to asbestos in friction products (brakes and clutches).

Facilities

Operations and maintenance (O&M) practices are used to control hazards of asbestos.

Other

  • Applicability Determination Index (ADI). Environmental Protection Agency (EPA). Enables the user to query the database of National Emissions Standards for Hazardous Air Pollutants (NESHAP) which includes "regulatory interpretations". Enter keyword "Asbestos".
  • Asbestos in Your Home. Environmental Protection Agency (EPA). Provides EPA guidance for home owners.


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