Occupational exposure limits (OELs) are developed for protection of healthy workers; they are not intended for the general public, which includes sensitive populations such as infants, the elderly, or the infirm. OELs are based on repeated daily exposures over a working lifetime. They are normally averaged over an 8-hour workday and serve to protect against acute and chronic health effects.

In 2013 the development of Workplace Environmental Exposure Levels (WEELs®managed by the non-profit organization Toxicology Excellence for Risk Assessment (TERA). AIHA will continue to provide a link to the OARS-WEEL webpage where the updated values are posted.​​