This lecture, by Dr. Susan Arnold, provides a thorough overview of Occupational Exposure Limits (OELs). This course includes:

  • A historical overview of OELs,
  • OELs today, and
  • The process of developing and updating OELs.


The online lecture starts with a historical background of the development of Occupational Exposure Limits (OELs). Then it moves onto the state of OELs today, including discussing the different limits developed by different organizations.

The lecture then moves on to discuss Threshold Limit Values (TLV), including:

  •  TWA (Time Weighted Average) TLVs
  • STEL (Short-Term Exposure Limit) TLVs
  • TLV Notations (SKIN, SEN, CANCER and BEI)

The lecture also describes different OEL methodologies and the advantages and limitations of each method.


Upon completion of the module, the learner with be able to:

  1. Understand the historical background in the development of occupational exposure limits (OELs)
  2. Recognize the challenges of setting exposure limits, including obtaining research data and dealing with industrial resistance.
  3. Be able to describe what is a Threshold Limit Value (TLV) and how they differ from other OELs by other organizations
  4. Know the four TVL Notations (SKIN, SEN, CANCER and BEI) and what each denotes.
  5. Be able to describe what is indicated by a TWA (Time Weighted Average) TLV, a STEL (Short-Term Exposure Limit) TLV, and TLV-c (Ceiling)
  6. Be able to describe OEL methodologies and their limitations:
    • Analogy
    • Correlation
    • Low Dose Extrapolation
    • Safety/Uncertainty Factors


  • The registration fee is refundable if a cancellation request by the registrant is received seven days prior to the course start date. No refund is available after that time.
  • In the event of a course cancellation, a complete refund of fees paid will be made. In the event of a cancellation, the University of Minnesota is not responsible for participant housing or travel expenses incurred by the registrants.


This course is eligible for:

  • 2 contact hours of professional continuing education
  • 0.20 continuing Education Units (CEUs)


For questions regarding this course, contact Continuing Public Health Education and Outreach at 612-626-4515 | cpheo@umn.edu.

Enroll Now - Select a section to enroll in
Section Title
Occupational Exposure Limits
Online, self paced
Jan 04, 2024 to Jan 06, 2025
Delivery Options
Self Paced Online  
Course Fee(s)
0 $0.00
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