2026-05875: Air Plan Approval; Iowa; Revisions to Iowa Air Quality Regulations

A. Revisions to the Iowa SIP

Iowa requested the following revisions to SIP-approved chapters: Chapter 20--SCOPE OF TITLE--DEFINITIONS is rescinded. Most definitions previously located in this chapter have been moved to the revised Chapters 21, 22, or 23. Numerous definitions from this chapter were no longer relevant because the terms no longer appear in section 567 of the Iowa Code and were therefore deleted. Chapter 21--COMPLIANCE is retitled COMPLIANCE, EXCESS EMISSIONS, AND MEASUREMENT OF EMISSIONS. Revisions to this chapter include the removal of the Emission Reduction Program language; adoption by reference of federal language; incorporation of rules from the now- removed Chapters 24, 25, 26, and 29; removal of numerous definitions; updated citations; and minor revisions to grammar and wording. Chapter 22--CONTROLLING POLLUTION--PERMITS is retitled CONTROLLING AIR POLLUTION--CONSTRUCTION PERMITTING. Revisions to SIP-approved text at IAC 567-22.1 through IAC 567-22.10 and IAC 567-22.200 through IAC 567-22.209 include the removal of the Voluntary Operating Permit Program; incorporation of rules from the now-removed Chapters 20 and 28; language relocation; updated citations; and minor revisions to grammar and wording. Additionally, SIP-approved text at IAC 567- 22.105(2)``i''(5) and IAC 567-22.300 were relocated to Chapter 24. Chapter 23--EMISSION STANDARDS is retitled AIR EMISSION STANDARDS. Revisions to this chapter include removal of redundant language; updated citations; and minor revisions to grammar and wording. Chapter 24--EXCESS EMISSIONS is retitled OPERATING PERMITS. This chapter incorporates two SIP-approved sections from the former Chapter 22. The SIP-approved sections are located in IAC 567-24.105(2)``i''(5) and IAC 567-24.300 in the submitted revisions. Revisions to SIP- approved sections are administrative in nature and include updated citations and minor revisions to grammar and wording. Chapter 25--MEASUREMENT OF EMISSIONS is rescinded. IAC 567-25.1 was previously SIP approved and is relocated to the new Chapter 21, with the exception of IAC 567-25.1(12), which retains its SIP approval. Chapter 26--PREVENTION OF AIR POLLUTION EMERGENCY EPISODES is rescinded. All sections were previously SIP approved and are relocated to the new Chapter 21, where they retain SIP approval. Chapter 28--AMBIENT AIR QUALITY STANDARDS is rescinded. IAC 567- 28.1 of this chapter was previously SIP approved and is relocated to the revised Chapter 21, where it retains its SIP approval. Chapter 29--QUALIFICATIONS IN VISUAL DETERMINATION OF THE OPACITY OF EMISSIONS is rescinded. IAC 567-29.1 of this chapter was previously SIP approved and is relocated to the revised Chapter 21, where it retains its SIP approval. Chapter 31--NONATTAINMENT AREAS is retitled NONATTAINMENT NEW SOURCE REVIEW. Revisions to this chapter include the removal of language referencing nonattainment areas, because Iowa no longer has any areas designated nonattainment prior to May 18, 1998; updated citations; and minor revisions to grammar and wording. Chapter 33--SPECIAL REGULATIONS AND CONSTRUCTION PERMIT REQUIREMENTS FOR MAJOR STATIONARY SOURCES--PREVENTION OF SIGNIFICANT DETERIORATION (PSD) OF AIR QUALITY is retitled CONSTRUCTION PERMIT REQUIREMENTS FOR MAJOR STATIONARY SOURCES--PREVENTION OF SIGNIFICANT DETERIORIATION (PSD). Revisions to this chapter include numerous adoptions by reference of federal language, removal of redundant language, updated citations, and minor revisions to grammar and wording.

B. EPA Analysis of SIP Revisions

The EPA reviewed the submitted SIP revisions in accordance with the anti-backsliding provisions of CAA section 110(l). While most revisions were administrative in nature, Iowa also requested removal of the Emission Reduction Program (IAC 567-21.3) and the Voluntary Operating Permits Program (IAC 567-22.200 through IAC 567-22.209). The EPA approved the Emission Reduction Program as part of the SIP on May 31, 1972 (37 FR 10842). The program provided a mechanism for sources to reduce emissions in exchange for a variance or for an extension of a variance granted by IDNR. The EPA finds that while IDNR removed the Emission Reduction Program from its regulations, it also strengthened its existing variance language by requiring the State to weigh the impact on public health that the variance would create versus the potential hazard to health or property that alternative methods of compliance may impact. If IDNR concludes that emissions caused by the variance would harm public health, IDNR would not grant the variance, and the removal of the Emission Reduction Program from the SIP does not impact [[Page 14660]] this analysis. In addition, the EPA notes that IDNR retains discretion to use existing enforcement authorities to obtain emission reductions in exchange for granting a variance. Therefore, the EPA concludes that removing the Emission Reduction Program from the SIP does not interfere with any applicable requirement concerning attainment and reasonable further progress under CAA section 110(l). The EPA approved IDNR's voluntary operating permit (VOP) program as part of the SIP on April 30, 1996 (61 FR 18958). This program primarily served as a CAA section 112(l) mechanism to establish federally enforceable operational limits to restrict potential to emit (PTE) to avoid Title V and other major source requirements. The program also provided a mechanism to limit emissions of criteria pollutants, and the EPA approved it as part of the SIP under CAA section 110. In 2015, IDNR removed the VOP program rules from the Iowa Administrative Code because it determined that the construction permit program could provide a mechanism to issue synthetic minor permits. Prior to removing VOP program rules, IDNR either modified construction permits or issued new construction permits for VOP facilities, as necessary, as described in the ``Voluntary Operating Permit Background and Summary'' document in the docket for this rulemaking. The VOP program is not a required program under CAA section 110. The EPA finds that Iowa's Chapter 22 construction permit rules provide adequate authority for limiting a source's PTE of criteria pollutants to below major source thresholds. As such, Iowa's removal of the VOP regulations from the SIP does not interfere with any applicable requirement concerning attainment and reasonable further progress under CAA section 110(l).

A. Background

A SIP is a federally enforceable collection of regulations and documents used by a state, territory, or local air district to implement, maintain, and enforce the National Ambient Air Quality Standards (NAAQS) and to fulfill other requirements of the CAA that require SIP measures (e.g., measures addressing regional haze under CAA section 169A). The NAAQS addresses six criteria pollutants: carbon monoxide, nitrogen dioxide, ozone, lead, particulate matter, and sulfur dioxide. Each federally approved SIP protects air quality primarily by addressing air pollution at its point of origin through air pollution regulations and control strategies. CAA section 110(k)(6), authorizes the EPA, when it ``determines that [its] action approving, disapproving, or promulgating any plan or plan revision (or part thereof) . . . was in error,'' to ``revise such action as appropriate.'' CAA section 110(k)(6) provides the EPA with the authority to make corrections to prior SIP actions that are subsequently found to be in error in the same manner as the prior action and do so without requiring any further submission from the state. While section 110(k)(6) provides the EPA with the authority to correct its own ``error,'' nowhere does this provision or any other provision in the CAA define what qualifies as ``error.'' Thus, the term should be given its ordinary meaning. See Johnson v. United States, 559 U.S. 133, 138 (2010). The plain language, every day meaning of ``error'' encompasses all unintentional, incorrect or wrong actions or mistakes; see Error, MERRIAM-WEBSTER'S COLLEGIATE DICTIONARY (11th ed. 2004) (``an act that through ignorance, deficiency, or accident departs from or fails to achieve what should be done''). In this rulemaking, the EPA proposes to remove IAC 567--Chapter 27, IAC 567--Subrule 23.1(1), IAC 567--Subrule 22.1(3)``b''(8), and IAC 567-Subrule 22.7(2)``f'' from the Iowa SIP under CAA section 110(k)(6). On November 19, 2025, Iowa concurred with removal of these provisions. Because Iowa agrees with the EPA that these chapters were approved into the SIP in error, the EPA interprets the state's concurrence as a withdrawal of Iowa's request that the EPA approve revisions to these chapters into the SIP. The EPA determined during its review of this rulemaking that these four rules were inappropriate for inclusion into the SIP because they are not related to implementation, maintenance, or enforcement of the NAAQS or otherwise required by the CAA to be included in the SIP. The analysis of each provision proposed for removal from Iowa's SIP is discussed below and in the TSDs for this action.

B. Analysis of IAC 567--Chapter 27--Certificate of Acceptance

Congress enacted the CAA in 1970. CAA section 110(a)(1) requires each state to submit a SIP to the EPA that provides for the implementation, maintenance and enforcement of the NAAQS. In the 1970s and early 1980s, [[Page 14661]] state and local agencies submitted thousands of regulations to the EPA for inclusion in SIPs to meet new federal requirements. In many cases, states submitted entire air pollution program regulations, including many elements not required by the CAA. Due to time and resource constraints, the EPA's review of these submittals focused primarily on the rules addressing the new substantive requirements of the CAA, and we approved many other elements into the SIP with minimal review. We now recognize that some of these elements are appropriate for state and local agencies to adopt and implement, but not as federally enforceable SIP requirements. Chapter 27--Certificate of Acceptance \1\ was first approved into the Iowa SIP on May 31, 1972 (37 FR 10842). The EPA approved subsequent administrative revisions on September 12, 1985 (50 FR 37176) and June 29, 1990 (55 FR 26690). Chapter 27 provides political subdivisions, such as municipalities and counties, with the conditions necessary to obtain and maintain a certificate of acceptance issued by the state for a local air pollution control program. This chapter is administrative in nature, and includes requirements related to the local agency's legal authority, enforcement program, staffing requirements, office space, staff transportation, and control program activities. --------------------------------------------------------------------------- \1\ Iowa's Certificate of Acceptance regulations were initially codified in Chapter 3 of the Iowa Administrative Code air regulations. --------------------------------------------------------------------------- The Linn County and Polk County local air programs are currently the only two local air programs in Iowa with certificates of acceptance issued under the authority of IAC 567--Chapter 27. Each county implements its own air pollution control ordinances, and is responsible for inspections of facilities, tracking emissions data, air quality monitoring, and compliance at major and minor facilities within its area of jurisdiction. The state retains concurrent enforcement authority. Iowa submits each county's air pollution control ordinances to the EPA for approval into the SIP. The EPA first approved Linn County's air pollution control ordinances into the Iowa SIP on August 15, 1989 (54 FR 33526) and has approved subsequent revisions, with the most recent revision approved on July 1, 2023 (89 FR 54362). The EPA first approved a portion of Polk County's air pollution ordinances into the Iowa SIP on August 15, 1989 (54 FR 33528), subsequently approving most of the remaining ordinances on November 29, 1989 (56 FR 60924). The most recent revision to Polk County's air pollution ordinances was approved on September 21, 2021 (86 FR 52413). Pursuant to 40 CFR 51.232, a state may assign legal authority to carry out the state implementation plan within a local agency's jurisdiction if the plan demonstrates that the local agency has the necessary legal authority to carry out the plan. The state provides this demonstration in an infrastructure SIP submission which provides the necessary structural requirements for each new or revised NAAQS. The EPA's most recent approval of Iowa's demonstration that its local agencies have the legal authority to carry out the SIP appears in EPA's August 23, 2021, approval of Iowa's infrastructure SIP for the 2015 ozone NAAQS. See 86 FR 46984. EPA's approval of county air quality ordinances into the SIP does not depend on whether a county has a certificate of acceptance from the state. Furthermore, EPA's approval of the state's infrastructure SIP submission does not depend on whether a local agency has obtained a certificate of acceptance issued under Chapter 27. Therefore, the EPA proposes to remove Chapter 27 from the Iowa SIP because the EPA approved Chapter 27 in error and it is not required by the CAA for implementation, maintenance, or enforcement of the NAAQS.

C. Analysis of IAC 567--Subrule 22.1(3)``b''(8)--Application for a

Case-by-Case MACT Determination During the review of this rulemaking, the EPA determined that IAC 567-22.1(3)``b''(8)--Application for a case-by-case MACT determination- be removed from the Iowa SIP. This subrule was approved into the Iowa SIP on December 3, 1999 (64 FR 67784). IAC 567-22.1(3)``b''(8) provides the requirements for sources to apply for a case-by-case maximum achievable control technology (MACT) determination in a construction permit application for the construction or reconstruction of a major source of hazardous air pollutants. Case-by-case MACT determinations are required by CAA section 112(j) and 40 CFR part 63, subpart B if EPA misses the deadline for promulgating a section 112(d) standard by more than 18 months. Accordingly, the EPA is proposing to remove IAC 567- 22.1(3)``b''(8) from the Iowa SIP because it relates to section 112 requirements and the control of air toxics rather than criteria pollutants and is therefore not required by the CAA for implementation, maintenance, or enforcement of the NAAQS.

D. Analysis of IAC 567--Subrule 25.1(12)--Alternative Emission Control

Program Trade Off Sulfur Dioxide CEMS Requirements During its review of this rulemaking, the EPA determined that IAC 567-25.1(12) was approved into the Iowa SIP in error on September 12, 1985 (50 FR 37176). IAC 567-25.1(12) requires sources with an approved alternative emission control program under IAC 567-22.7(1) that involves the trade-off of sulfur dioxide emissions to install, calibrate, maintain and operate a continuous emissions monitoring system (CEMS) for sulfur dioxide. At the time that the EPA approved IAC 567-25.1(12) into the SIP, IAC 567-22.7(1) was not part of the SIP, and has not been subsequently approved. Therefore the requirement for a source with an approved alternative emission control program to operate a sulfur dioxide CEMs was not an enforceable requirement of the SIP. Iowa moved the requirements of IAC 567-25.1(12) to IAC 567- 22.7(2)``f''. Accordingly, EPA is proposing to remove IAC 567-25.1(12) from the SIP because it was not an enforceable requirement of the SIP and is therefore not required by the CAA for implementation, maintenance, or enforcement of the NAAQS.

E. Analysis of IAC 567--Subrule 23.1(1)--In General

In its July 16, 2024, submittal, Iowa excluded its revision to IAC 567-23.1(1) from the SIP. IAC 567-23.1(1) states that the NSPS shall apply as specified in IAC 567-23.1(2), which is not approved into the SIP. In addition, the rule states that the NESHAPs shall apply as specified in IAC 567-23.1(3), which is not approved into the SIP. Finally, the rule requires compliance with all other emission standards to be in accordance with Chapter 21--Compliance, a chapter which is approved into the SIP, and does not rely on IAC 567-23.1(1) in order to be enforceable. During its review of this rulemaking, the EPA determined that IAC 567-23.1(1) was approved into the Iowa SIP in error on May 31, 1972 (37 FR 10842). This subrule is a general provision that pertains to federal standards, such as the NSPS and NESHAPs, and requires compliance with regulations that are not approved into the SIP. Iowa requests delegation of certain NSPS and NESHAPs under a delegation agreement with the EPA.\2\ For these reasons, the [[Page 14662]] EPA is proposing to remove IAC 567-23.1(1) from the Iowa SIP because it is not required by the CAA for implementation, maintenance, or enforcement of the NAAQS. --------------------------------------------------------------------------- \2\ See https://www.epa.gov/ia/delegation-authority-iowa-new-source-performance-standards-and-national-emission-standards. ---------------------------------------------------------------------------

F. Section 193 ``Anti-Backsliding'' Analysis

CAA section 193 provides that, for SIP control requirements in effect before November 15, 1990, any ``modification'' thereof must ``insure[ ] equivalent or greater emissions reductions'' of the air pollutant for which the area is in nonattainment. 42 U.S.C. 7515. Congress added this provision in the 1990 Amendments as part of an effort to ensure adequate support for NAAQS attainment and maintenance. Consistent with the provision's plain text, Congress' intent in adopting this provision was to provide a `back-up' anti-backsliding provision for nonattainment areas beyond what was provided by 110(l).\3\ As a general matter, this ``anti-backsliding'' analysis is required when modifying SIP control requirements, whether through section 110(k)(6) or otherwise, if the modification impacts pre-1990 control requirements in a nonattainment area. --------------------------------------------------------------------------- \3\ See, e.g., Senate Debate on the 1990 Amendments to the CAA Conference Report (Oct. 26, 1990), 1990 CAA Legis. Hist. 1097, 1126- 1127 (Comments of Senator Chafee, R-RI, primary drafter of CAA Amendments of 1990). --------------------------------------------------------------------------- All areas of Iowa are designated in attainment or maintenance of each NAAQS. See 40 CFR 81.316. As a result, the EPA's proposed removal of the above rules from the Iowa SIP is not subject to the general savings clause in CAA section 193.

1. The authority citation for part 52 continues to read as follows:

Authority: 42 U.S.C. 7401 et seq. Subpart Q--Iowa 0

2. In Sec. 52.820, in the table in paragraph (c):

0 a. Remove the center heading ``Chapter 20--Scope of Title-- Definitions'' and the entries ``567-20.1'', ``567-20.2'', and ``567- 20.3''. 0 b. Revise the center heading ``Chapter 21--Compliance'' to read ``Chapter 21--Compliance, Excess Emissions, and Measurement of Emissions'' and the entries ``567-21.1'', ``567-21.2'', ``567-21.3'', ``567-21.4'', ``567-21.5'', and ``567-21.6'' and add the entries ``567- 21.7'', ``567-21.8'', ``567-21.10'', ``567-21.13'', ``567-21.14'', ``567-21.15'', ``567-21.16'', and ``567-21.17''. 0 c. Revise the center heading ``Chapter 22--Controlling Pollution'' to read ``Chapter 22--Controlling Air Pollution'' and the entries ``567- 22.1'', 567-22.2'', ``567-22.3'', 567-22.4'', ``567-22.5'', ``567- 22.8'', ``567-22.9'', and ``567-22.10''; add the entry ``567-22.11''; and remove the entries ``567-22.105'', ``567-22.200'', ``567-22.201'', ``567-22.202'', ``567-22.203'', ``567-22.204'', ``567-22.205'', ``567- 22.206'', ``567-22.207'', ``567-22.208'', ``567-22.209'', and ``567- 22.300''. 0 d. Revise the center heading ``Chapter 23--Emission Standards for Contaminants'' to read ``Chapter 23-Air Emission Standards'' and the entries ``567-23.1'', ``567-23.2'', ``567-23.3'', and ``567-23.4''. 0 e. Revise the center heading ``Chapter 24--Excess Emissions'' to read ``Chapter 24-Operating Permits''; remove the entries ``567-24.1'' and 567-24.2''; and add the entries ``567-24.105'' and ``567-24.300''. 0 f. Remove the center heading ``Chapter 25--Measurement of Emissions'' and the entry ``567-25.1''. 0 g. Remove the center heading ``Chapter 26--Prevention of Air Pollution Emergency Episodes'' and the entries ``567-26.1'', ``567-26.2'', ``567- 26.3'', and ``567-26.4''. 0 h. Remove the center heading ``Chapter 27--Certificate of Acceptance'' and the entries ``567-27.1'', ``567-27.2'', ``567-27.3'', ``567-27.4'', and ``567-27.5''. 0 i. Remove the center heading ``Chapter 28--Ambient Air Quality Standards'' and the entry ``567-28.1''. 0 j. Remove the center heading ``Chapter 29--Qualification in Visual Determination of the Opacity of Emissions'' and the entry ``567-29.1''. 0 k. Revise the center heading ``Chapter 31--Nonattainment Areas'' to read ``Chapter 31--Nonattainment New Source Review'' and the entries ``567-31.1'', ``567-31.3'', ``567-31.4'', ``567-31.9'', and ``567- 31.10'' and remove entries ``567-31.2 and 567-31.20''. 0 l. Revise the center heading ``Chapter 33--Special Regulations and Construction Permit Requirements for Major Stationary Sources-- Prevention of Significant Deterioration (PSD) of Air Quality'' to read ``Chapter 33-Construction Permit Requirements for Major Stationary Sources--Prevention of Significant Deterioration (PSD)'' and the entries ``567-33.1'', ``567-33.3'', ``567-33.9'', and 567-33.10''. The revisions and additions read as follows: Sec. 52.820 Identification of plan. * * * * * (c) * * * EPA-Approved Iowa Regulations ---------------------------------------------------------------------------------------------------------------- State Iowa citation Title effective EPA approval date Explanation date ---------------------------------------------------------------------------------------------------------------- Iowa Department of Natural Resources Environmental Protection Commission [567] ---------------------------------------------------------------------------------------------------------------- * * * * * * * ---------------------------------------------------------------------------------------------------------------- Chapter 21--Compliance, Excess Emissions, and Measurement of Emissions ---------------------------------------------------------------------------------------------------------------- 567-21.1.................. Definitions and 6/19/2024 [Date of publication ...................... compliance of the final rule in requirements. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.2.................. Variances.............. 6/19/2024 [Date of publication ...................... of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.4.................. Circumvention of rules. 6/19/2024 [Date of publication ...................... of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.5.................. Evidence used in 6/19/2024 [Date of publication ...................... establishing that a of the final rule in violation has occurred the Federal or is occurring. Register], 91 FR [Federal Register page where the document begins of the final rule]. [[Page 14664]] 567-21.6.................. Temporary electricity 6/19/2024 [Date of publication ...................... generation for of the final rule in disaster situations. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.7.................. Excess emission 6/19/2024 [Date of publication ...................... reporting. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.8.................. Maintenance and repair 6/19/2024 [Date of publication ...................... requirements. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.10................. Testing and sampling of 6/19/2024 [Date of publication ...................... new and existing of the final rule in equipment. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.13................. Methodology and 6/19/2024 [Date of publication ...................... qualified observer. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.14................. Prevention of air 6/19/2024 [Date of publication ...................... pollution emergency of the final rule in episodes--general. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.15................. Episode criteria....... 6/19/2024 [Date of publication ...................... of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.16................. Preplanned abatement 6/19/2024 [Date of publication ...................... strategies. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-21.17................. Actions taken during 6/19/2024 [Date of publication ...................... episodes. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. ---------------------------------------------------------------------------------------------------------------- Chapter 22--Controlling Air Pollution ---------------------------------------------------------------------------------------------------------------- 567-22.1.................. Definitions and permit 6/19/2024 [Date of publication The definitions for requirements for new of the final rule in ``anaerobic lagoon,'' or existing stationary the Federal ``odor,'' ``odorous sources. Register], 91 FR substance,'' [Federal Register ``odorous substance page where the source'' are not SIP document begins of approved. the final rule]. 567-22.2.................. Processing permit 6/19/2024 [Date of publication ...................... applications. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-22.3.................. Issuing permits........ 6/19/2024 [Date of publication Subrule 22.3(6) is not of the final rule in SIP approved. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-22.4.................. Major stationary 6/19/2024 [Date of publication ...................... sources located in of the final rule in areas designated the Federal attainment or Register], 91 FR unclassified (PSD). [Federal Register page where the document begins of the final rule]. 567-22.5.................. Major stationary 6/19/2024 [Date of publication ...................... sources located in of the final rule in areas designated the Federal nonattainment. Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-22.8.................. Permit by rule......... 6/19/2024 [Date of publication ...................... of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-22.9.................. Special requirements 6/19/2024 [Date of publication ...................... for visibility of the final rule in protection. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. [[Page 14665]] 567-22.10................. Permitting requirements 6/19/2024 [Date of publication ...................... for country grain of the final rule in elevators, country the Federal grain terminal Register], 91 FR elevators, grain [Federal Register terminal elevators and page where the feed mill equipment. document begins of the final rule]. 567-22.11................. Ambient air quality 6/19/2024 [Date of publication ...................... standards. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. ---------------------------------------------------------------------------------------------------------------- Chapter 23--Air Emission Standards ---------------------------------------------------------------------------------------------------------------- 567-23.1.................. Emission standards..... 6/19/2024 [Date of publication Subrules 23.1(1)-(5) of the final rule in are not SIP approved. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-23.2.................. Open burning........... 6/19/2024 [Date of publication Subrule 23.2(3)j is of the final rule in not SIP approved. the Federal Variances from Register], 91 FR opening burning rule [Federal Register 23.2(2) are subject page where the to EPA approval. document begins of the final rule]. 567-23.3.................. Specific contaminants.. 6/19/2024 [Date of publication Subrule 23.3(3)``(d)'' of the final rule in is not SIP approved. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-23.4.................. Specific processes..... 6/19/2024 [Date of publication Subrule 23.4(10) is of the final rule in not SIP approved. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. ---------------------------------------------------------------------------------------------------------------- Chapter 24--Operating Permits ---------------------------------------------------------------------------------------------------------------- 567-24.105................ Title V permit 6/19/2024 [Date of publication Only subparagraph applications. of the final rule in 24.105(2)i(5) is SIP the Federal approved. Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-24.300................ Operating permit by 6/19/2024 [Date of publication ...................... rule for small sources. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. ---------------------------------------------------------------------------------------------------------------- Chapter 31--Nonattainment New Source Review ---------------------------------------------------------------------------------------------------------------- 567-31.1.................. Permit requirements 6/19/2024 [Date of publication ...................... relating to of the final rule in nonattainment area. the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-31.3.................. Nonattainment new 6/19/2024 [Date of publication ...................... source review (NNSR) of the final rule in requirements for areas the Federal designated Register], 91 FR nonattainment. [Federal Register page where the document begins of the final rule]. 567-31.4.................. Preconstruction review 6/19/2024 [Date of publication ...................... permit program. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-31.9.................. Actuals PALs........... 6/19/2024 [Date of publication ...................... of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-31.10................. Validity of rules...... 6/19/2024 [Date of publication ...................... of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. ---------------------------------------------------------------------------------------------------------------- Chapter 33--Construction Permit Requirements for Major Stationary Sources--Prevention of Significant Deterioration (PSD) ---------------------------------------------------------------------------------------------------------------- 567-33.1.................. Purpose................ 6/19/2024 [Date of publication ...................... of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. [[Page 14666]] 567-33.3.................. PSD construction permit 6/19/2024 [Date of publication Provisions of the 2010 requirements for major of the final rule in PM2.5 PSD-Increments, stationary sources. the Federal SILs, and SMCs rule Register], 91 FR are excluded from [Federal Register 33.3(20) and are not page where the SIP approved. document begins of the final rule]. 567-33.9.................. Plantwide applicability 6/19/2024 [Date of publication ...................... limitations. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. 567-33.10................. Exceptions to adoption 6/19/2024 [Date of publication ...................... by reference. of the final rule in the Federal Register], 91 FR [Federal Register page where the document begins of the final rule]. * * * * * * * ---------------------------------------------------------------------------------------------------------------- * * * * * PART 70--STATE OPERATING PERMIT PROGRAMS 0

4. Appendix A to part 70 is amended by adding paragraph (aa) under

``Iowa'' to read as follows: Appendix A to Part 70--Approval Status of State and Local Operating Permits Programs * * * * * Iowa * * * * * (aa) The Iowa Department of Natural Resources submitted for program approval revisions to rules 567--Chapter 22 and 567-30.4 on July 26, 2024. Rules 567-22.100 through 567-22.300(12) are now located in Chapter 24 and are referred to as 567-24.100 through 567- 24.300(12). Rules 567-22.117 through 567-22.119 (now 567-24.117 through 567-24.119) as well as rules 567-22.210 through 567-22.299 (now 567-24.210 through 567-24.299) remain reserved and are not part 70 approved. Previously part 70 approved rules 567-22.200 through 567-22.209 (now 567-24.200 through 567-24.209) have been reserved as a part of this approval and are no longer part 70 approved. Revisions were also made to rule 567-30.4. Numerous definitions located in 576-22.1, 567-22.10(1), and 567-23.1(4) retain part 70 approval. The state effective date is June 19, 2024. The proposed revision effective date is [date 30 days after date of publication of the final rule in the Federal Register]. * * * * * [FR Doc. 2026-05875 Filed 3-25-26; 8:45 am] BILLING CODE 6560-50-P