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Proposed Rule2026-16001

Air Plan Approval; Illinois; 2015 Ozone Moderate and Serious Reasonably Available Control Technology Update

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Published
August 6, 2026

Issuing agencies

Environmental Protection Agency

Abstract

The U.S. Environmental Protection Agency (EPA) is proposing to approve revisions to 35 Illinois Administrative Code (IAC) parts 217, 218, and 219 into the Illinois State Implementation Plan (SIP). The Illinois Environmental Protection Agency (Illinois or Illinois EPA) submitted these revisions on December 18, 2024, and May 12, 2025, supplemented their submittal on August 13, 2025, for Moderate Reasonably Available Control Technology (RACT). The EPA is proposing to approve 35 IAC parts 217, 218, and 219 as satisfying the Moderate Volatile Organic Compound (VOC) RACT and NO<INF>X</INF> RACT requirements as well as Serious NO<INF>X</INF> RACT requirements for the Chicago, IL (Cook County, DuPage County, Grundy County, Kane County, Kendall County, Lake County, McHenry County, and Will County) and Metro-East St. Louis (Madison County, Monroe County, and St. Clair County) nonattainment areas under the 2015 ozone National Ambient Air Quality Standard (NAAQS or standard).

Full Text

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<title>Federal Register, Volume 91 Issue 150 (Thursday, August 6, 2026)</title>
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[Federal Register Volume 91, Number 150 (Thursday, August 6, 2026)]
[Proposed Rules]
[Pages 50746-50749]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-16001]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R05-OAR-2024-0617; EPA-R05-OAR-2024-0618; EPA-R05-OAR-2025-0259; 
FRL-13135-01-R5]


Air Plan Approval; Illinois; 2015 Ozone Moderate and Serious 
Reasonably Available Control Technology Update

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: The U.S. Environmental Protection Agency (EPA) is proposing to 
approve revisions to 35 Illinois Administrative Code (IAC) parts 217, 
218, and 219 into the Illinois State Implementation Plan (SIP). The 
Illinois Environmental Protection Agency (Illinois or Illinois EPA) 
submitted these revisions on December 18, 2024, and May 12, 2025, 
supplemented their submittal on August 13, 2025, for Moderate 
Reasonably Available Control Technology (RACT). The EPA is proposing to 
approve 35 IAC parts 217, 218, and 219 as satisfying the Moderate 
Volatile Organic Compound (VOC) RACT and NO<INF>X</INF> RACT 
requirements as well as Serious NO<INF>X</INF> RACT requirements for 
the Chicago, IL (Cook County, DuPage County, Grundy County, Kane 
County, Kendall County, Lake County, McHenry County, and Will County) 
and Metro-East St. Louis (Madison County, Monroe County, and St. Clair 
County) nonattainment areas under the 2015 ozone National Ambient Air 
Quality Standard (NAAQS or standard).

DATES: Comments must be received on or before September 8, 2026.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R05-
OAR-2024-0617, EPA-R05-OAR-20 24-0618, and EPA-R05-OAR-2025-0259 at 
<a href="https://www.regulations.gov">https://www.regulations.gov</a>, or via email to <a href="/cdn-cgi/l/email-protection#0c6d7e7e6d227f6d7e6d644c697c6d226b637a"><span class="__cf_email__" data-cfemail="97f6e5e5f6b9e4f6e5f6ffd7f2e7f6b9f0f8e1">[email&#160;protected]</span></a>. For 
comments submitted at <a href="http://Regulations.gov">Regulations.gov</a>, follow the online instructions 
for submitting comments. Once submitted, comments cannot be edited or 
removed from the docket. The EPA may publish any comment received to 
its public docket. Do not submit to the EPA's docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> any information you consider to be Confidential 
Business Information (CBI), Proprietary Business Information (PBI), or 
other information whose disclosure is restricted by statute. Multimedia 
submissions (audio, video, etc.) must be accompanied by a written 
comment. The written comment is considered the

[[Page 50747]]

official comment and should include discussion of all points you wish 
to make. The EPA will generally not consider comments or comment 
contents located outside of the primary submission (i.e., on the web, 
cloud, or other file sharing system). For additional submission 
methods, please contact the person identified in the FOR FURTHER 
INFORMATION CONTACT section. For the full EPA public comment policy, 
information about CBI, PBI, or multimedia submissions, and general 
guidance on making effective comments, please visit <a href="https://www.epa.gov/dockets/commenting-epa-dockets">https://www.epa.gov/dockets/commenting-epa-dockets</a>.

FOR FURTHER INFORMATION CONTACT: Nicole Naber, Air and Radiation 
Division (AR18J), Environmental Protection Agency, Region 5, 77 West 
Jackson Boulevard, Chicago, Illinois 60604, telephone number: (312) 
886-6609, email address: <a href="/cdn-cgi/l/email-protection#5f313e3d3a2d7131363c30333a1f3a2f3e71383029"><span class="__cf_email__" data-cfemail="2a444b484f580444434945464f6a4f5a4b044d455c">[email&#160;protected]</span></a>.

SUPPLEMENTARY INFORMATION: Throughout this document whenever ``we,'' 
``us,'' or ``our'' is used, we mean the EPA.

Table of Contents

I. What is the EPA proposing?
II. What is the background for this action?
III. What is the EPA's evaluation of Illinois' VOC and 
NO<INF>X</INF> RACT determinations?
    A. Certifying existing sections of 35 IAC part 219 as VOC RACT 
for Chicago and Metro-East
    B. Permits for One Source Covered by the Oil and Natural Gas 
Industry CTG
    C. Negative Declarations
    D. 35 IAC 217
    E. RACT Due Diligence
IV. What action is the EPA taking?
V. Incorporation by Reference.

I. What is the EPA proposing?

    The EPA is proposing to approve 35 IAC parts 218 and 217 as 
satisfying the Moderate ozone nonattainment area VOC RACT requirements 
of Clean Air Act (CAA) section 182(b)(2), and the corresponding 
NO<INF>X</INF> RACT requirements stemming from sections 182(b) and 
182(f), respectively, for the Chicago, IL nonattainment area under the 
2015 ozone standard. The EPA is also proposing to approve 35 IAC parts 
219 and 217 as satisfying the Moderate area VOC and NO<INF>X</INF> RACT 
requirements for the Metro-East nonattainment area under the 2015 ozone 
standard. For both nonattainment areas, the EPA is also proposing to 
approve 35 IAC part 217 as satisfying the Serious area NO<INF>X</INF> 
RACT requirements from CAA sections 182(c) and 182(f). The Serious area 
VOC RACT requirements will be addressed in a separate action. On 
December 18, 2024, Illinois submitted attainment plans for both ozone 
nonattainment areas containing certifications that 35 IAC parts 218 and 
219 satisfy the Moderate VOC RACT requirements and supplemented the 
submittal on August 13, 2025. On May 12, 2025, Illinois also submitted 
SIP revisions to 35 IAC part 217 to satisfy the Moderate and Serious 
NO<INF>X</INF> RACT requirements.\1\
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    \1\ See clarification letter in the docket.
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II. What is the background for this action?

    Emissions of VOCs and NO<INF>X</INF> contribute to the production 
of ground-level ozone, or smog, which harms human health and the 
environment. The EPA defines RACT as the lowest emission limit that a 
particular source is capable of meeting by the application of control 
technology that is reasonably available considering technological and 
economic feasibility. See Memorandum from Roger Strelow, Assistant 
Administrator for Air and Waste Management, EPA, to Regional 
Administrators, EPA, ``Guidance for Determining Acceptability of SIP 
Regulations in Non-Attainment Areas'' (December 9, 1976); see also 44 
FR 53761, 53762 (September 17, 1979). Control Techniques Guidelines 
(CTGs) provide recommendations to inform State, local, and Tribal air 
agencies as to what constitutes RACT for categories of VOC sources. CAA 
sections 182(b)(2) and 182(f), in combination, require States to 
implement RACT in ozone nonattainment areas classified as Moderate (and 
higher). Specifically, these areas are required to implement RACT for 
all major sources of VOC and NO<INF>X</INF> (based on potential to emit 
at least 100 tons per year (tpy)) and for all VOC sources covered by a 
CTG. Air agencies can use the recommendations in the CTG and consider 
all recent relevant information to inform their own determination as to 
what constitutes RACT. If there are no sources covered by a certain CTG 
within a nonattainment area, a State may submit a negative declaration, 
in place of regulatory requirements, to apply RACT for that category of 
sources.
    The EPA's SIP Requirements Rule for the 2008 ozone NAAQS indicates 
that States may meet RACT through the establishment of new or more 
stringent requirements that meet RACT control levels, through a 
certification that previously adopted RACT controls for a prior ozone 
NAAQS continue to represent adequate RACT control levels for the 2008 
ozone NAAQS, or with a combination of these two approaches. See 80 FR 
12264, 12278-79 (March 6, 2015). As previously stated, a State may 
submit a negative declaration in instances where there are no sources 
covered by a particular CTG. The EPA's SIP Requirements Rule for the 
2015 ozone NAAQS retains the existing general 2008 RACT requirements 
for purposes of the 2015 ozone NAAQS. See 83 FR 62998, 63001-02, and 
63007 (December 6, 2018).
    Effective August 3, 2018 (83 FR 25776), the EPA designated the 
Illinois portions of the Chicago and Metro-East St. Louis areas as 
Marginal nonattainment areas for the 2015 ozone NAAQS. The Illinois 
portion of the Chicago nonattainment area includes Cook, DuPage, Kane, 
Lake, McHenry, and Will counties, as well as Aux Sable and Goose Lake 
Townships in Grundy County, and Oswego Township in Kendall County. The 
Illinois portion of Metro-East nonattainment area includes Madison, St. 
Clair, Monroe counties in Illinois, and St. Louis, St. Louis City, St. 
Charles, and Jefferson counties, as well as Boles Township in Franklin 
County in Missouri. On October 7, 2022 (87 FR 60897), the EPA 
determined that the Chicago and Metro-East areas failed to attain the 
2015 ozone NAAQS by the August 3, 2021, attainment date, resulting in 
the reclassification of the areas from Marginal to Moderate ozone 
nonattainment. In that action, the EPA established January 1, 2023, as 
the due date for the State to submit all Moderate area nonattainment 
plan SIP requirements applicable to newly reclassified areas. More 
recently, on December 17, 2024 (89 FR 101901), the EPA determined that 
both areas did not attain the standards by the Moderate attainment 
date; therefore, the areas were reclassified to Serious ozone 
nonattainment. This action addresses the Moderate area VOC and both 
Moderate and Serious NO<INF>X</INF> RACT SIP submissions for the 
Chicago and Metro-East nonattainment areas under the 2015 ozone 
standard. Serious VOC RACT for both nonattainment areas will be 
addressed in a separate action.

III. What is the EPA's evaluation of Illinois' VOC and NOX RACT 
determinations?

    The EPA previously determined that 35 IAC parts 218 and 219 VOC 
regulations met Moderate RACT for requirements associated with the 2008 
ozone NAAQS and incorporated them into the Illinois SIP. See action 
dated May 20, 2022 (87 FR 30828) for Chicago, and March 23, 2012 (77 FR 
16940) for Metro-East. For certain categories of sources, Illinois is 
certifying that the previously adopted RACT regulations and controls 
contained in 35 IAC parts

[[Page 50748]]

218 and 219 for VOCs continue to satisfy RACT requirements under the 
2015 ozone NAAQS. Illinois has also adopted new RACT regulations in 35 
IAC 217 for NO<INF>X.</INF> The new NO<INF>X</INF> regulations apply to 
both the Chicago and Metro-East, Illinois 2015 ozone nonattainment 
areas.

A. Certifying Existing Sections of 35 IAC Part 219 as VOC RACT for 
Chicago and Metro-East

    The EPA approved 35 IAC parts 218 and 219 into the Illinois SIP 
under previous ozone standards. For this action, the EPA and Illinois 
performed RACT due diligence \2\ analyses to determine what level of 
controls can be established as RACT. These analyses are provided in 
both the Chicago and Metro-East submittals and are described in detail 
in section III, subsection E of this preamble. The EPA has not 
identified any new control technologies that are reasonably available 
considering technological and economic feasibility for these sources 
since our last approval, and, therefore, the EPA is proposing to 
determine that the controls for the CTG categories covered in 35 IAC 
parts 218 and 219 still represent RACT for implementing the 2015 ozone 
standard in both Illinois nonattainment areas.
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    \2\ See https//<a href="http://www.epa.gov/ground-level-ozone-pollution/resource-document-air-agencies-developing-ract-sip-revisions-ozone">www.epa.gov/ground-level-ozone-pollution/resource-document-air-agencies-developing-ract-sip-revisions-ozone</a>
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B. Permits for One Source Covered by the Oil and Natural Gas Industry 
CTG

    Illinois identified one source located in the Metro-East 
nonattainment area that is covered by the EPA's 2016 CTG for the Oil 
and Natural Gas Industry. Instead of adopting categorical RACT rules 
for the source, Illinois requested that the EPA approve the source 
specific federally enforceable permit for the Flint Hills Resources 
Pine Bend facility (Pine Bend) for incorporation into the Illinois SIP. 
The EPA is proposing to approve this permit into the SIP to fulfill the 
RACT requirements for the Metro-East nonattainment area for the 
category of sources covered by the Oil and Gas CTG.
    Pine Bend contains four crude oil storage tanks. The 2016 CTG 
recommends a 95% reduction of VOC emissions from these tanks. In 2024, 
the EPA issued updated New Source Performance Standards (NSPS) at 40 
CFR part 60, subpart Kb. The 2024 NSPS Standards of Performance for 
Storage Vessels for Petroleum Liquids requires an external floating 
roof, a fixed roof, or a vapor recovery system to reduce VOC emissions 
by at least 95% for these tanks. Since the Pine Bend State permit 
requires the source to utilize an external floating roof, which is 
equivalent to or better than a vapor recovery system and reduces VOC 
emissions by at least 95%, the permit is equivalent to, or better than, 
the CTG recommendation as well as the newer NSPS, and we are not aware 
of any other relevant information to inform this determination. 
Therefore, the EPA is proposing to approve the Illinois EPA Federally 
Enforceable State Operating Permit No. 83100026 into the SIP as 
satisfying RACT for Pine Bend in the Metro-East nonattainment area 
under the 2015 ozone standard.

C. Negative Declarations

    For the Chicago nonattainment area, Illinois submitted Negative 
Declarations for the following CTG categories: Ship Building and Ship 
Repair Industry; Natural Gas/Gasoline Processing Plants; Aerospace 
Manufacturing and Rework Facilities; High-Density Polyethylene, 
Polypropylene, and Polystyrene Resins; Vegetable Oil Processing; 
Industrial Wastewater; and Oil and Natural Gas Industry. Illinois 
performed searches for facilities meeting each of these CTG categories 
in the Chicago nonattainment area for the 2015 ozone standard and 
determined that there are no sources subject to any of these CTGs in 
this nonattainment area.
    For the Metro-East nonattainment area, Illinois submitted Negative 
Declarations for the following CTG categories: Ship Building and Ship 
Repair Industry; Natural Gas/Gasoline Processing Plants; Aerospace 
Manufacturing and Rework Facilities; High-Density Polyethylene, 
Polypropylene, and Polystyrene Resins; Vegetable Oil Processing; and 
Industrial Wastewater. Illinois conducted searches for facilities 
meeting each of these CTG categories in the Metro-East nonattainment 
area for the 2015 ozone standard and determined that there are no 
sources subject to any of these CTGs in this nonattainment area.
    The EPA reviewed the information submitted by Illinois related to 
these negative declarations and agrees with the State's determinations 
that no covered sources for these CTGs exist in the relevant 
nonattainment areas. As such, the EPA is proposing to approve these 
negative declarations as meeting RACT.

D. 35 IAC 217

    To satisfy the requirements under CAA sections 172 and 182 to adopt 
NO<INF>X</INF> RACT regulations with respect to the 2015 ozone 
standard, Illinois amended 35 IAC 217. CAA section 182(f) defines a 
major stationary source in a Moderate ozone or a Serious ozone 
nonattainment area as one that directly emits, or has the potential to 
emit, 100 tpy or more of NO<INF>X</INF> or 50 tpy or more of 
NO<INF>X</INF>, respectively.
    These NO<INF>X</INF> RACT rules establish non-CTG RACT general 
provisions, including updated measurement methods for NO<INF>X</INF>, 
added predictive emission monitoring system (PEMS) to the abbreviations 
used in this part, removed or updated outdated materials, and added a 
Federal regulation governing combustion tuning requirements. Illinois 
EPA's amendments also include federally enforceable NO<INF>X</INF> 
emissions limitations and testing and monitoring requirements for the 
following NO<INF>X</INF> source categories: any industrial boiler, 
process heater, glass melting furnace, cement kiln, lime kiln, iron and 
steel reheat, annealing, or galvanizing furnace, aluminum reverberatory 
or crucible furnace, or fossil fuel-fired stationary boiler that emits 
NO<INF>X</INF> in an amount equal to or greater than 15 tpy and that is 
located at a source in the Chicago or Metro-East ozone nonattainment 
area that has the potential to emit NO<INF>X</INF> in an amount equal 
to or greater than 50 tpy.
    Illinois' submittal also included provisions for an emissions 
averaging plan, which is a type of Economic Incentive Program (EIP), as 
an alternative method to satisfying NO<INF>X</INF> RACT requirements. 
CAA section 182(g)(4) required the EPA to promulgate rules for EIPs, 
which the EPA did on April 7, 1994.\3\ In 2001 EPA issued further 
guidance on discretionary EIPs.\4\ The EPA's 1994 rule allows sources 
subject to RACT requirements to attain RACT-level emissions reductions 
in the aggregate, but directs States, to the extent practicable, to 
require increased emissions reductions beyond those that would be 
achieved through a traditional RACT program. The EPA's 2001 EIP 
guidance provides for a presumptive approach for complying with RACT 
requirements though an EIP. For areas needing and lacking an approved 
attainment demonstration, the 2001 EIP guidance specifies that this 
requirement can be met through an additional 10% reduction in 
emissions. Illinois' rules utilize this presumptive approach, 
specifying that, for sources opting to comply through averaging, an 
additional 10 percent emissions reduction is required. Source 
participation in Illinois' EIP is voluntary

[[Page 50749]]

as a source can meet the RACT requirements of Illinois' proposed rules 
by instead complying with the NOx limits applicable to each unit.
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    \3\ April 7, 1994, 59 FR 16690.
    \4\ ``Improving Air Quality With Economic Incentive Programs,'' 
January 2001.
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    The EPA is proposing that the emissions limits for NO<INF>X</INF> 
sources satisfy Moderate and Serious RACT requirements as they are 
equal to or more stringent than NO<INF>X</INF> requirements for similar 
sources in other States' rules as discussed in section III, subsection 
E of this preamble.

E. RACT Due Diligence

    As part of its December 18, 2024, and May 12, 2025, submittals, 
Illinois certified that the RACT requirements for Moderate CTG and non-
CTG VOC and NO<INF>X</INF> sources and Serious CTG and non-CTG 
NO<INF>X</INF> sources in the Chicago and Metro-East 2015 ozone 
nonattainment areas have been fulfilled. Illinois conducted its RACT 
analysis for VOC and NO<INF>X</INF> by: (1) Identifying all categories 
of CTG and major non-CTG sources of VOC and NO<INF>X</INF> emissions 
within both nonattainment areas; (2) Listing the Illinois State 
regulation that implements or exceeds RACT requirements for that CTG or 
non-CTG category; and (3) Submitting negative declarations when there 
are no CTG applicable sources within the Chicago and Metro-East areas.
    The EPA performed a supplemental due diligence analysis for the 
Illinois VOC and NO<INF>X</INF> RACT submittals for the Chicago and 
Metro-East nonattainment areas under the 2015 ozone standard. In the 
EPA's December 2025 Technical Support Document (available in the 
docket), the EPA details the basis for concluding that Illinois' 
current VOC and new NO<INF>X</INF> regulations fulfill RACT through 
comparison with RACT rules developed by other States, CTG guidance 
documents and applicable ACT documents. The EPA evaluated the relevant 
RACT rules in various States including some other EPA Region 5 States 
(Ohio, Michigan, Indiana, Wisconsin) and other States located in EPA 
Regions 1, 2, 6, 8, and 9 (Maine, Vermont, California, Colorado, Texas, 
Arizona, New Jersey, Connecticut, and New York). The EPA found 
Illinois' rules to be generally consistent with or more stringent than 
control measures in other States' regulations, CTGs, and non-CTGs. The 
EPA has not identified any new control technologies that are reasonably 
available considering technological and economic feasibility for these 
sources. Based upon our findings, the EPA proposes to determine that 
Illinois' rules represent Moderate level VOC and NO<INF>X</INF> RACT as 
well as Serious NO<INF>X</INF> RACT.

IV. What action is the EPA taking?

    The EPA is proposing to approve 35 IAC parts 218 and 219 as 
satisfying the Moderate area VOC RACT requirements of CAA section 
182(b)(2) for both the Chicago and Metro-East nonattainment areas under 
the 2015 ozone standard. The EPA is also proposing to approve revisions 
to 35 IAC part 217 as satisfying the Moderate and Serious 
NO<INF>X</INF> RACT requirements of 182(b)(2), 182(c), and 182(f)of the 
CAA for the Chicago and Metro-East nonattainment areas under the 2015 
ozone standard.

V. Incorporation by Reference

    In this rulemaking, The EPA is proposing to include in a final EPA 
rule regulatory text that includes incorporation by reference. In 
accordance with requirements of 1 CFR 51.5, the EPA is proposing to 
incorporate by reference Illinois rules 35 IAC parts 218 and 219, 
effective December 9, 2024, and 35 IAC 217, effective April 23, 2025, 
discussed in section III of this preamble. The EPA is also proposing to 
incorporate by reference Illinois Operating Permit 83100026 for the 
Flint Hills Pine Bend facility, issued June 20, 2024. The EPA has made, 
and will continue to make, these documents generally available through 
<a href="http://www.regulations.gov">www.regulations.gov</a> and at the EPA Region 5 Office (please contact the 
person identified in the FOR FURTHER INFORMATION CONTACT section of 
this preamble for more information).

VI. Statutory and Executive Order Reviews

    Under the CAA, the Administrator is required to approve a SIP 
submission that complies with the provisions of the CAA and applicable 
Federal regulations. 42 U.S.C. 7410(k); 40 CFR 52.02(a). Thus, in 
reviewing SIP submissions, the EPA's role is to approve State choices, 
provided that they meet the criteria of the CAA. Accordingly, this 
action merely approves State law as meeting Federal requirements and 
does not impose additional requirements beyond those imposed by State 
law. For that reason, this action:
    <bullet> Is not a significant regulatory action subject to review 
by the Office of Management and Budget under Executive Order 12866 (58 
FR 51735, October 4, 1993);
    <bullet> Is not an Executive Order 14192 (90 FR 9065, February 6, 
2025) regulatory action because this action is not significant under 
Executive Order 12866;
    <bullet> Does not impose an information collection burden under the 
provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.);
    <bullet> Is certified as not having a significant economic impact 
on a substantial number of small entities under the Regulatory 
Flexibility Act (5 U.S.C. 601 et seq.);
    <bullet> Does not contain any unfunded mandate or significantly or 
uniquely affect small governments, as described in the Unfunded 
Mandates Reform Act of 1995 (Pub. L. 104-4);
    <bullet> Does not have federalism implications as specified in 
Executive Order 13132 (64 FR 43255, August 10, 1999);
    <bullet> Is not subject to Executive Order 13045 (62 FR 19885, 
April 23, 1997) because it approves a State program;
    <bullet> Is not a significant regulatory action subject to 
Executive Order 13211 (66 FR 28355, May 22, 2001); and
    <bullet> Is not subject to requirements of section 12(d) of the 
National Technology Transfer and Advancement Act of 1995 (15 U.S.C. 272 
note) because application of those requirements would be inconsistent 
with the CAA.
    In addition, the SIP is not approved to apply on any Indian 
reservation land or in any other area where the EPA or an Indian Tribe 
has demonstrated that a Tribe has jurisdiction. In those areas of 
Indian country, the rulemaking does not have Tribal implications and 
will not impose substantial direct costs on Tribal governments or 
preempt Tribal law as specified by Executive Order 13175 (65 FR 67249, 
November 9, 2000).

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Incorporation by 
reference, Intergovernmental relations, Nitrogen oxides, Ozone, 
Volatile organic compounds.

    Dated: July 27, 2026.
Anne Vogel,
Regional Administrator, Region 5.
[FR Doc. 2026-16001 Filed 8-5-26; 8:45 am]
BILLING CODE 6560-50-P


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