EPA Proposes Redesignation of Illinois Portion of St. Louis Area to Attainment of 2008 Ozone Standard

Summary

The Environmental Protection Agency (EPA) is proposing to redesignate the Illinois portion of the St. Louis-St. Charles-Farmington, Missouri-Illinois area to attainment of the 2008 ozone National Ambient Air Quality Standard (NAAQS) based on 2014-2016 monitoring data, and to approve a revision to the Illinois State Implementation Plan (SIP) to maintain the 2008 ozone standard through 2030 in the St. Louis area.