Detroit SO2 Federal Implementation Plan
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Rule Summary
EPA is finalizing a Federal Implementation Plan (FIP) for attaining the 1-hour sulfur dioxide (SO2) primary national ambient air quality standard (NAAQS) for the Detroit SO2 nonattainment area.
The FIP includes an attainment demonstration and other elements required under the Clean Air Act. In addition to an attainment demonstration, the FIP addresses the requirement for meeting reasonable further progress (RFP) toward attainment of the NAAQS, reasonably available control measures and reasonably available control technology (RACM/RACT), and contingency measures. This action supplements a prior action which found that Michigan had satisfied emission inventory and new source review (NSR) requirements for this area but had not met requirements for the elements addressed in the proposed FIP.
EPA determines that the FIP provides for attainment of the 2010 1-hour primary SO2 NAAQS in the Detroit SO2 nonattainment area and meets the other applicable requirements under the Clean Air Act. An explanation of the Clean Air Act requirements for SO2 nonattainment areas as well as a FIP for the Detroit area with respect to these requirements are provided in the notice of proposed rulemaking.
Public Comments
EPA held a 45-day public comment period following the publication of the proposed plan on June 1, 2022, as well as a virtual public hearing on June 16, 2022. In the notice of final rulemaking, EPA responded to a variety of comments from industry, residents, and environmental advocates. EPA is making minor changes to the proposed regulatory text due to comments received but is generally finalizing the FIP as proposed.