WEBINAR - Notations: How are They Assigned and How Should They be Used in Industrial Hygiene Practice?


This webinar will focus on the Notations recommended by the Threshold Limit Values for Chemical Substances (TLV®-CS) Committee. The purpose of Notations is to highlight toxicity endpoints that set certain chemical substances apart and to alert the practicing industrial hygienist that special considerations need to be given to these materials to ensure adequate protection of workers. The intent of the webinar is to give attendees an improved understanding of Skin, DSEN, RSEN, OTO, and IFV notations and the ACGIH® Carcinogen Classifications and how they can be used to optimize their exposure control programs. The webinar will be comprised of: (1) a brief overview; (2) discussion of the purpose of special notations; (3) description of how each notation was derived, including description of the types of background information, data and specific criteria used; and (4) discussion of how to use notations in the application and interpretation of TLVs®. “Real-world” examples will be used throughout the webinar to illustrate how the various notations are assigned and how these should be interpreted and applied by the practicing industrial hygienist.

Learning Objectives

After participating in this webinar, attendees will:

  • Understand the basis for Notations in general and each individually
  • Learn how notations complement the TLV®-TWAs, TLV®-STELs, and Ceiling values
  • Become familiar with the criteria used to assign each notation
  • Be able to determine how to interpret and apply each notation in their workplace
  • Learn how to incorporate notations within a comprehensive exposure control program

Who Should Attend this Webinar?

Practicing Industrial Hygienists, Environmental Health and Safety Professionals, Occupational Toxicologists, and Occupational Physicians

What is an ACGIH® Webinar?

ACGIH® is dedicated to providing quality, scientific, educational events. One method of doing this is to offer distance-learning webinars. A webinar, short for Web-based seminar, is a presentation, lecture, or seminar that is transmitted over the Internet. A key feature of a webinar is its interactive elements — the ability to give, receive and discuss information. Webinars are as effective as on-site presentations without the travel expense. This ACGIH® webinar is 2 hours in duration and consists of a live presentation given via the Internet with an audio telephone link similar to that of a conference call.


This webinar contains 2 contact hours and may be eligible for CIH CM credit. See the ABIH website (abih.org) for CM credit criteria. This webinar may also qualify for CSP recertification points. See the BCSP website (bcsp.org) for details. Participants seeking confirmation of attendance for the webinar from ACGIH® must attend the live webinar or view the archive and submit a final exam and evaluation. Certificates of Completion will be issued in a timely manner after receipt and completion of these items.