# Air Plan Approval; Illinois; Infrastructure SIP Requirements for the 2012 PM2.5 and 2015 Ozone NAAQS > **Rule** · Direct final rule. · Published 2021-09-29 · Effective 2021-11-29 · 86 FR 53872 ## Document - **Document number:** 2021-21027 - **Category:** air-emissions - **Federal Register citation:** 86 FR 53872 - **CFR reference:** 40 CFR 52 - **Publication date:** 2021-09-29 - **Effective date:** 2021-11-29 - **State:** IL - **EPA docket:** EPA-R05-OAR-2017-0583 ## Abstract The Environmental Protection Agency (EPA) is approving elements of a State Implementation Plan (SIP) revision submitted by the State of Illinois regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2012 PM2.5 and 2015 ozone National Ambient Air Quality Standards (NAAQS). Additionally, EPA is approving the infrastructure requirements related to Prevention of Significant Deterioration (PSD) for previous NAAQS. The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA. ## Source - [Federal Register document](https://www.federalregister.gov/documents/2021/09/29/2021-21027/air-plan-approval-illinois-infrastructure-sip-requirements-for-the-2012-pm25-and-2015-ozone-naaqs) --- *AI Analytics · CC0 1.0*