U.S. EPA is working with Illinois EPA and Sterigenics to address emissions of ethylene oxide from the company’s facility in Willowbrook, Illinois. In July 2018, the company installed additional pollution controls to capture ethylene oxide emissions. U.S. EPA and Illinois EPA will work with the company to evaluate the effectiveness of those controls, conduct additional monitoring, and determine whether additional actions are needed. U.S. EPA will provide updates on this website.