“The community needs an explanation of what these results mean in terms of the long-term health impact for nearby residents,” said U.S. Rep. Bill Foster, a Naperville Democrat who, along with the state’s two senators, Democrats Dick Durbin and Tammy Duckworth, had earlier this week sent their own letter urging the EPA to take more aggressive action. “We also need a plan to detect and monitor non-stack emissions of ethylene oxide to ensure safe levels in Willowbrook and the surrounding areas.”