Air Plan Approval: EPA Proposes Revisions to Iowa Air Quality Regulations and State Implementation Plan

The U.S. Environmental Protection Agency (EPA) is proposing to approve a set of administrative and structural revisions to Iowa's State Implementation Plan (SIP) and Operating Permit Program. These changes incorporate recent updates to the Iowa Administrative Code (IAC) and are designed to streamline and modernize the state's air quality regulatory framework without weakening environmental protections. Key structural changes include the consolidation of 14 regulatory chapters into 8, removal of the Voluntary Operating Permit Program, elimination of the Emission Reduction Program language, and replacement of duplicative provisions with direct references to existing state statutes and federal regulations. Several rules have been renumbered and minor grammar and language clarifications have been made throughout. Additionally, the EPA is proposing to correct erroneous prior incorporations of certain rules into the Iowa SIP under section 110(k)(6) of the Clean Air Act (CAA), rectifying past administrative errors. The agency has determined that none of these revisions reduce the stringency of the SIP or negatively impact air quality in Iowa. This is a proposed rule, meaning a public comment period will follow before any final approval is issued. The proposal aligns with CAA requirements and represents a housekeeping modernization of Iowa's air quality regulatory structure.

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