Press Release

ACGIH® Presents Derived No Effect Levels (DNELs): What Are They and How Will They Change the Occupational Health OEL Landscape? Webinar



Cincinnati, Ohio — January 15, 2010 — ACGIH® will present the Derived No Effect Levels (DNELs): What Are They and How Will They Change the Occupational Health OEL Landscape? webinar on March 3, 2010 at the following times:

2:00 p.m. – 4:30 p.m. Eastern Time
1:00 p.m. – 3:30 p.m. Central Time
12:00 p.m. – 2:30 p.m. Mountain Time
11:00 a.m. – 1:30 p.m. Pacific Time

The European Union (EU) REACH regulation has prompted hazard and exposure assessments and risk characterizations of thousands of existing substances currently in commerce in the EU. Derived No Effect Levels (DNELs) are examples of the information being generated as a result of the new requirements, and are used for purposes of risk characterization. There are some concerns that DNELs will become de-facto occupational exposure limits (OELs) - an issue this webinar will address. To adequately assess how DNELs compare to OELs, it is important to understand how they are derived and how they will be applied or used in Europe. Just as OELs have limitations and conditions regarding their use, the same can be said for DNELs and that comparison will be made as well. Finally, the benefits of DNELs and how they could fit into the OEL derivation process will be discussed.

After participating in this webinar, attendees will:

  • Understand what a DNEL is, the level of customization, and how DNELs are derived.
  • Understand the aspects that are to be considered when deriving a DNEL.
  • Understand the real-world application of DNELs in Europe.
  • Know how DNELs compare to OELs.
  • Be aware of the potential direct and indirect benefits of DNELs.
  • Be aware of the limitations and boundaries of use.
  • Understand how a DNEL might be used in OEL development.
  • Know where the data can be found and what ECHA and stakeholders might do with the DNELs and associated information.

ACGIH® is pleased to offer webinar attendees an audio option. U.S. and Canadian attendees can connect to the audio portion of the webinar via the toll-free audio telephone link or listen to the audio portion through an audio stream directly through their computer. Other international participants can listen via the audio stream without incurring additional telephone charges.

John Mikan, CIH and T. Stuart Webster, MS, CIH will present this webinar.

John Mikan, CIH – Mr. Mikan is President of Experien Health Sciences, Inc. He is a board-certified industrial hygienist with more than 22 years of experience addressing matters of human health, workplace safety, and product stewardship. Mr. Mikan has held key leadership positions within several multinational oil and chemical companies where he worked closely with senior management on a broad range of issues having the potential to impact manufacturing operations and commercial affairs. This experience, combined with his more recent experience in managing a rapidly growing international consulting firm, provides a solid foundation to help webinar attendees understand and communicate the issue of DNELs in terms of their potential to impact the bottom line.

T. Stuart Webster, MS, CIH – Mr. Webster has a BS degree from the University of New Mexico and an MS degree in Environmental Health from the University of Cincinnati. He is certified in the comprehensive practice of industrial hygiene by the American Board of Industrial Hygiene. He is a Managing Principal of Experien Health Sciences, Inc., which has offices in North America and Europe. Mr. Webster has 20 years of occupational health, industrial hygiene, environmental/ecological, and safety experience with multi-national corporations and as a consultant. Recent projects include exposure assessments at industrial facilities for chemical, biological, physical and ergonomic agents; chemical contamination investigations; product registrations and ecotox modeling; EPA High Production Volume (HPV) chemical submissions; regulatory and registration reviews of substances that could contact food; and damage assessments following hurricane catastrophes. In addition, he provides traditional industrial hygiene services to clients such as the evaluation and control of worker exposure to chemical, biological, and physical agents.

This webinar is pending approval by the American Board of Industrial Hygiene (ABIH) for .42 ABIH (IH) Certification Maintenance (CM) Point. This webinar qualifies for .15 BCSP (SP) Continuance of Certification (COC) Point for Certified Safety Professionals. 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. For more detailed information about the Derived No Effect Levels (DNELs): What Are They and How Will They Change the Occupational Health OEL Landscape? webinar, contact Tammy Vanderbilt at To register for this exciting event, visit the ACGIH® website at

ACGIH® is a member-based organization that advances occupational and environmental health. ACGIH® is one of the industry's leading publications resources, with approximately 400 titles relative to occupational and environmental health and safety, including the renowned TLVs® and BEIs®. For more information, visit the ACGIH® website at or call our Customer Service Representatives at 513-742-2020.


Amy B. Bloomhuff, Esq., CAE
Associate Executive Director