Occupational exposure limit
An occupational exposure limit is an upper limit on the acceptable concentration of a hazardous substance in workplace air for a particular material or class of materials. It is typically set by competent national authorities and enforced by legislation to protect occupational safety and health. It can be a tool in risk assessment and in the management of activities involving handling of dangerous substances. There are many dangerous substances for which there are no formal occupational exposure limits. In these cases, control banding strategies can be used to ensure safe handling.
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 the 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.
Although peer-reviewed health-based OELs are preferred for establishing safe levels of exposure or for implementing adequate controls to provide worker protection, the lack of publicly available OELs have led to other sources of safe levels to protect workers. Industrial or Occupational Hygienists are often on the front line of anticipating and recognizing the hazards of chemical exposure for workers, and must assess the risk of exposure through the use of OELs so that proper control strategies can be implemented to keep workers below the OEL values. In the absence of OELs however, there are a variety of tools that can and should be used to assess exposure potential of workers. The "Hierarchy of OELs" provides a continuum of occupational exposure limit values that allow assessment of the risk of exposure in order to apply adequate controls. 
- European Agency for Safety and Health at Work. "Occupational Exposure Limits". Retrieved 2008-04-24.
- IOHA. "International OEL Issues and Activities \ url=http://www.ioha.net/internationaloelssues.html".
- >AIHA. "Webinar: The New Era of Global Exposure Limit Setting Processes - Harmonization on an OEL Hierarchy Approach"\ url=http://www.aiha.org".
- Dikshith, T. S. S. & Diwan, P. V. (2003). Industrial Guide to Chemical and Drug Safety. Wiley-IEEE. pp. pp189–191. ISBN 0-471-23698-5. (Google Books)
- Topping, M. (2001). "Occupational Exposure Limits for Chemicals". Occupational and Environmental Medicine 58 (2): 138–144. doi:10.1136/oem.58.2.138. PMC 1740099. PMID 11160994.
- Proposals to introduce a new occupational exposure limits (OEL) framework HSC Consultative Document
- Discussion document on Occupational Exposure Limits (OEL) framework (HSE, UK)
- OELs and the effective control of exposure to substances hazardous to health in the UK (HSE paper)
- EH40/2005 Workplace exposure limits (HSE, UK)
- Occupational Exposure Limits Summary - EU Member States
- The role of occupational exposure limits in the health and safety systems of EU Member States by D Walters and others. Health and Safety Executive Research Report No. 172/2003
- Occupational exposure limits and their economic costs by J Cherrie. Institute of Occupational Medicine Research Report TM/86/02
- The IOM’s position on occupational exposure limits for dust Institute of Occupational Medicine Position Paper
- Threshold Limit Value
- Indicative limit value
- PIMEX A method to make invisible hazards in the work environment visible and thus facilitate the reduction of hazards and risks in workplaces
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