On October 19, 2017, the Board adopted final rule amendments that keep Illinois’ ambient air quality standards “identical in substance” to the National Ambient Air Quality Standards (NAAQS). The amendments reflect actions taken by the United States Environmental Protection Agency during the last half of 2016 and the first half of 2017. Among its actions, USEPA adopted the implementation rule for the 2012 primary annual PM2.5 NAAQS and revised the requirements for handling monitoring data influenced by exceptional events. During its rulemaking, the Board received public comment and held a public hearing. The Board rulemaking is captioned National Ambient Air Quality Standards, USEPA Amendments (July 1, 2016 through December 31, 2016, March 20, 2017, May 11, 2017, and June 16, 2017), docket R17-10. For more information, please contact Jason James at 312-814-6929 or jason.james@illinois.gov.
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