Iowa's Muscatine County Air Plan Approved by EPA
Published Date: 8/21/2025
Proposed Rule
Summary
The EPA is giving a thumbs-up to Muscatine County, Iowa, for cleaning up its air and meeting the 2010 sulfur dioxide pollution standards. This means Muscatine moves from 'needs work' to 'all clear' status, with a plan to keep the air fresh and some permit updates for local sources. No big costs or delays—just cleaner air and a win for the community!
Analyzed Economic Effects
3 provisions identified: 3 benefits, 0 costs, 0 mixed.
Muscatine County SO2 Attainment
The EPA is proposing to redesignate Muscatine County, Iowa from nonattainment to attainment for the 2010 1-hour sulfur dioxide (SO2) National Ambient Air Quality Standard (NAAQS). This action means the area met the 2010 1-hour SO2 standard and would be officially reclassified under the Clean Air Act.
Approval of Maintenance Plan
The EPA is proposing to approve Iowa's maintenance plan for the 2010 1-hour SO2 NAAQS covering the Muscatine nonattainment area. The maintenance plan describes how the area will continue to meet the 2010 1-hour SO2 standard under the Clean Air Act.
Approval of Permit Modifications
The EPA is proposing to approve modifications to source-specific permits in the Iowa State Implementation Plan (SIP) related to the Muscatine area. These approvals are source-specific permit changes included in the SIP as part of the redesignation and maintenance actions for the 2010 1-hour SO2 NAAQS.
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