The United States Environmental Protection Agency (USEPA) published a direct final rule in the federal register to redesignate the Chicago and Granite City areas to be in attainment of the 2008 Lead National Ambient Air Quality Standards (2008 Pb NAAQS) on October 18, 2017 with an effective date of December 18, 2017. Due to an adverse comments received during the comment period, this direct final rule was withdrawn on December 8, 2017.
The USEPA has addressed comments and is approving the Illinois Environmental Protection Agency's (Illinois EPA's) request to redesignate these two areas to be in attainment of the 2008 Pb NAAAQS. The USEPA has provided detailed responses on comments and additional documentation is included in the final rulemaking. Additionally, as per the USEPA, the monitoring data indicates compliance with the 0.15 µg/m3 Pb NAAQS after the emissions limits and control measures under 35 IAC Part 226 became effective. These factors provided USEPA with sufficient statutory evidence as required by the Clean Air Act (CAA) to redesignate. As part of this approval, the IL State Implementation Plan (SIP) has been revised to include the following:
- Maintenance plan for a ten year period following redesignations;
- Emission inventories for the areas; and
- Rules applying emission limits and other control requirements for Pb sources.
This final rule became effective on March 28, 2018.