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Application of Exposure Guidelines
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Bog'liq tox exposure guidelines (1)
Application of Exposure Guidelines
In 29 CFR 1910.120, "Hazardous Waste Operations and Emergency Response" standard, OSHA
specifies the use of certain exposure limits. The exposure limits specified are OSHA's
permissible exposure limits (PELs) and "published exposure levels." The "published exposure
levels" are used when no PEL exists. A "published exposure level" is defined as "the exposure
limits published in 'NIOSH Recommendations for Occupational Health Standards' dated 1986
incorporated by reference. If none is specified, the exposure limits published in the standards
specified by the American Conference of Governmental Industrial Hygienists in their publication
Threshold Limit Values and Biological Exposure Indices.
Engineered Controls and Work Practices. 29 CFR 1910.120 (g) (1) (i) states "Engineering
controls and work practices shall be instituted to reduce and maintain employee exposure to or
below the permissible exposure limits for substances regulated by 29 CFR Part 1910, to the
extent required by Subpart Z, except to the extent that such controls and practices are not
feasible." (emphasis added) Whenever engineering controls and work practices are not feasible,
personal protective equipment shall be used to reduce and maintain exposures.
For those substances or hazards where there is no PEL, the published exposure levels, published
literature and material safety data sheets (MSDS) will be used for evaluation. In these
circumstances, a combination of engineering controls, work practices and PPE shall be used to
reduce and maintain exposures.
Personal Protective Equipment. Since PPE must be selected based on the hazards present at
the site, the exposure limits are used to evaluate the effectiveness of the PPE. Comparing the
actual or expected exposure to the PEL or other exposure limits gives the wearer information on
selection of the proper PPE.
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