Short-term exposure limit

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A short-term exposure limit (STEL) is the acceptable average exposure over a short period of time, usually 15 minutes as long as the time-weighted average is not exceeded.

STEL is a term used in occupational health, industrial hygiene and toxicology. The STEL may be a legal limit in the United States for exposure of an employee to a chemical substance. The Occupational Safety and Health Administration (U.S. OSHA) has set OSHA-STELs for 1,3-butadiene,[1] benzene[2] and ethylene oxide.[3] For chemicals, STEL assessments are usually done for 15 minutes and expressed in parts per million (ppm), or sometimes in milligrams per cubic meter (mg/m3).[4]

The American Conference of Governmental Industrial Hygienists publishes a more extensive list of STELs as threshold limit values (TLV-STEL).[5]

Similar national exposure limits[edit]

See also[edit]


  1. ^ 29CFR1910.1051
  2. ^ 29CFR1910.1028
  3. ^ 29CFR1910.1047
  4. ^ "Coshh Assessment Guide". Sunday, March 15, 2020
  5. ^ American Conference of Governmental Industrial Hygienists
  6. ^ "Workplace exposure limits".
  7. ^ "EH40/2005 Workplace exposure limits".
  8. ^ OES Occupational Exposure Standard Archived 2011-09-05 at the Wayback Machine