By this notice, the Occupational Safety and Health Administration (OSHA) amends its existing standard that regulates occupational exposure to ethylene oxide (29 CFR 1910.1047) by adopting an excursion limit for ethylene oxide (EtO) of 5 parts of EtO per million parts of air (5 ppm) averaged over a sampling period of 15 minutes. Where the excursion limit is exceeded, employers are obligated to reduce exposure through implementation of feasible engineering controls and work practices, supplemented by the use of respirators where necessary. In addition, employers are required to establish and implement a written compliance program to achieve the excursion limit, establish exposure monitoring and training programs for employees subjected to EtO exposure above the excursion limit, identify as regulated areas any locations where airborne concentrations of EtO normally exceed the excursion limit, and affix warning labels on products capable of releasing EtO to the extent that an employee's exposure would foreseeably exceed the excursion limit.