The U.S. Environmental Protection Agency (EPA) is taking final action to approve some elements and disapprove other elements of the Illinois State Implementation Plan (SIP) submission regarding some of the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2008 lead National Ambient Air Quality Standards (2008 Pb NAAQS). Structural components of each state’s air quality management program are ensured to adequately meet the CAA requirements through the rulemaking’s infrastructure requirements. Federally promulgated regulations administered by Illinois address the final regulations described in the rulemaking, thus, Illinois is not obligated to submit new or additional regulations to U.S. EPA.

This final rule becomes effective on August 15, 2014. This rule describes the final actions the U.S. EPA is taking to implement the SIP proposed by Illinois in December of 2012, certifying that the current SIP is sufficient to meet the infrastructure elements under sections 110(a)(1) and (2) for the 2008 Pb NAAQS. Since Illinois already administers federally promulgated PSD regulations through delegation, there are no practical effects associated with certain elements of today’s July 16, 2014’s final disapproval published on July 16, 2014.

The specific Illinois infrastructure SIP submissions being disapproved by the U.S. EPA include the following:

  • Provisions that address the 2008 Pb NAAQS;
  • The identification of nitrogen oxide (NOx) as a precursor to ozone consistent with the final implementation of the 8-Hour Ozone NAAQS;
  • The identification of sulfur dioxide (SO2) AND NOx as PM2.5 precursors and the regulation of PM2.5 and PM10 condensables to be consistent with the New Source Review (NSR) program for PM2.5;
  • The PM2.5 increments and associated rules to be consistent with the final rule on PSD for PM2.5 and;
  • Permitting of greenhouse gas (GHG) emitting sources at the Federal Tailoring Rule thresholds.

To see a summary table of all the final changes to the Illinois SIP, please visit the Office of the Federal Register webpage; the table is located at the end of Section 3.