Air Plan Approval; Iowa; Revisions to Iowa Air Quality Regulations

What it does

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Iowa State Implementation Plan (SIP) and the Operating Permit Program to incorporate recent changes to the Iowa Administrative Code (IAC). The revisions include removal of the Voluntary Operating Permit (VOP) Program language; removal of the Emission Reduction Program language; new and renumbered rules; replacement of duplicative language with references to state statute and federal regulations; updated definitions; consolidation of 14 chapters into 8 chapters; and minor clarifications to language and grammar. The EPA is also finalizing corrections to the erroneous incorporation of several rules into the Iowa SIP pursuant to the Clean Air Act (CAA). These revisions do not decrease the stringency of the SIP or have an adverse effect on air quality. The EPA's final approval of this rule revision is in accordance with the requirements of the CAA.

The Environmental Protection Agency's summary, as published in the Federal Register.

What changed in the regulation

2 parts of Title 40 of the Code of Federal Regulations:

40 CFR 52, 40 CFR 70

Wording on eCFR: the day before it took effect and from the day it took effect (first part listed).

Compared with

The Environmental Protection Agency has published 243 final rules in 2026 so far, compared with 263 in all of 2025.

Counted by the Tribune from Federal Register records since Jan. 1, 2025.

What happens next and when

This final rule is effective on August 17, 2026.

The agency's dates, word for word.

Check it yourself

• The document in the Federal Register
• Docket EPA-R07-OAR-2026-1156 on Regulations.gov
• Title 40 on eCFR

The record as published

Source: the Federal Register (public domain). The document in the Federal Register