• IOHA 2018 takes place in Washington, USA
  • IOHA 2015 took place in London.

International OEL Issues and Activities

Occupational Exposure Limits (OELs) have been established for airborne workplace chemicals by multiple regulatory and authoritative organizations around the world for well over 60 years now.  With the changing regulatory arena, shifting centers of manufacturing growth, and move towards a more global view on occupational hygiene issues, it is important for the Occupational Hygiene profession to understand the current and growing issues impacting the continued viability of OEL’s in our professional practice .

IOHA has created this space on our webpage to provide information on the issues and stimulate the discussion of approaches and solutions to the issues before the profession.  If you wish to add information to this space please contact

New – 2013

AIHA sponsored an OEL webinar titled Welcome to The New Era of Global Exposure Limit Setting Processes. To download the webinar recording and materials please click above.

2010 IOHA Rome Conference – Workshop #12 Presentations

At the recent IOHA 2010 Conference in Rome, Italy, a workshop was held which discussed the Exposure Setting Processes around the world, and the challenges and opportunities which lie ahead.

The presentations from that Workshop #12 are listed below and represent the views of the authors, and do not necessarily represent the views of IOHA. All correspondence regarding the presentations should be directed to the specific authors.

Workshop # 12: Exposure Setting Processes-An International Challenge

History of Occupational Exposure Limits  

OEL Setting Processes – North America

OELs Setting Processes – European Continent

The Inhalation DNEL Challenge

Occupational Exposure Limits (OEL’s) in China and India

LATIN AMERICA Occupational Exposure Limits

Exposure Limits: Global Challenges


2009 OEL Green Paper August 2009

Proposed Hierarchy Approach to OELs

2009 PCIH Presentation