Air Plan Approval; Illinois; Redesignation of the Chicago and Granite City Areas to Attainment of the 2008 Lead Standard

The Environmental Protection Agency (EPA) is approving the Illinois Environmental Protection Agency's (Illinois EPA's) request to redesignate the Chicago and Granite City nonattainment areas (hereafter also referred to as the "areas") to attainment for the 2008 national ambient air quality standards (NAAQS or standards) for lead, also identified as Pb. EPA is also approving, as revisions to the Illinois state implementation plan (SIP): The state's plan for maintaining the 2008 lead NAAQS in the areas for a period of ten years following these redesignations; the emissions inventories for the areas; and rules applying emission limits and other control requirements to lead sources in the areas. EPA is taking these actions in accordance with applicable regulations and guidance that address implementation of the 2008 lead NAAQS. EPA proposed this action on October 18, 2017, and received two public comments in response.