The Illinois Pollution Control Board (IPCB) issued a proposed rule to begin ambient air monitoring of ethylene oxide in the following locations: Northbrook, Schiller Park, Nilwood, Alton, and Bondville. The IPCB is proposing that the ambient monitoring for ethylene oxide would be conducted for a period of six consecutive calendar months with the monitoring period commencing no later than one year after the effective date of the rule. Samples collected over approximately 24 hours will be taken every 12 days.
The rule satisfies a statutory mandate for the state to supplement U.S. Environmental Protection Agency's (EPA) existing monitoring, with the purpose of determining background levels of ethylene oxide throughout the state. Under the proposal, the ambient air monitoring results would be publicly available within 30 days after receipt of each set of quality assured data. The proposed rule has a built-in “sunset” provision so that it will no longer apply 24 months after it becomes effective.