[Federal Register Volume 90, Number 241 (Thursday, December 18, 2025)]
[Rules and Regulations]
[Pages 59051-59057]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2025-23259]
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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Parts 52 and 81
[EPA-R09-OAR-2023-0539; FRL-11747-02-R9]
Air Plan Approval: Arizona: Infrastructure Requirements for the
2012 Fine Particulate Matter National Ambient Air Quality Standard
AGENCY: Environmental Protection Agency (EPA).
ACTION: Final rule.
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SUMMARY: The Environmental Protection Agency (EPA) is taking final
action to approve portions of the state implementation plan (SIP)
revisions submitted by the State of Arizona pursuant to the Clean Air
Act (CAA) for the implementation, maintenance, and enforcement of the
2012 fine particulate matter (PM2.5) national ambient air
quality standards (NAAQS or ``standards'') as proposed, except for
certain requirements related to prevention of significant deterioration
(PSD), which EPA will defer action on until a later date. In addition,
the EPA is approving regulatory provisions into the Arizona SIP and is
amending regulatory text to include La Paz County as part of Mohave-
Yuma Intrastate air quality control region (AQCR).
DATES: This rule is effective January 20, 2026.
ADDRESSES: The EPA has established a docket for this action under
Docket ID No. EPA-R09-OAR-2023-0539. All documents in the docket are
listed on the https://www.regulations.gov website. Although listed in
the index, some information is not publicly available, e.g.,
Confidential Business
[[Page 59052]]
Information (CBI) or other information whose disclosure is restricted
by statute. Certain other material, such as copyrighted material, is
not placed on the internet and will be publicly available only in hard
copy form. Publicly available docket materials are available through
https://www.regulations.gov, or please contact the person identified in
the FOR FURTHER INFORMATION CONTACT section for additional availability
information. If you need assistance in a language other than English or
if you are a person with a disability who needs a reasonable
accommodation at no cost to you, please contact the person identified
in the FOR FURTHER INFORMATION CONTACT section.
FOR FURTHER INFORMATION CONTACT: Michael Dorantes, Geographic
Strategies and Modeling Section (AIR-2-2), EPA Region IX, 75 Hawthorne
Street, San Francisco, CA, telephone number: (415) 972-3934, email
address: [email protected].
SUPPLEMENTARY INFORMATION: Throughout this document, ``we,'' ``us,''
and ``our'' refer to the EPA.
Table of Contents
I. Background
A. Statutory Requirements
B. State Submittals
C. Summary of EPA's Proposal and Incorporation of Rules Into
Arizona's State Implementation Plan
D. Revising Air Quality Control Regions and Evalutating
Emergency Episode Planning Requirements for PM2.5 in
Arizona
II. Public Comments and EPA Responses
III. Final Action
A. Approvals
B. Deferred Action
C. Incorporation of Rules Into Arizona's State Implementation
Plan
D. Revising Air Quality Control Regions and Evaluating Emergency
Episode Planning Requirements for PM2.5 in Arizona
IV. Incorporation by Reference
V. Statutory and Executive Order Reviews
I. Background
A. Statutory Requirements
Section 110(a)(1) of the CAA requires each state to submit to the
EPA, within three years after the promulgation of a primary or
secondary NAAQS or any revision thereof, a SIP revision that provides
for the implementation, maintenance, and enforcement of such NAAQS.
Section 110(a)(2) of the CAA contains the infrastructure SIP
requirements that generally relate to the information, authorities,
compliance assurances, procedural requirements, and control measures
that constitute the ``infrastructure'' of a state's air quality
management program. These infrastructure SIP requirements (or
``elements'') required by section 110(a)(2) are as follows:
Section 110(a)(2)(A): Emission limits and other control
measures.
Section 110(a)(2)(B): Ambient air quality monitoring/data
system.
Section 110(a)(2)(C): Program for enforcement of control
measures and regulation of new and modified stationary sources.
Section 110(a)(2)(D)(i): Interstate pollution transport.
Section 110(a)(2)(D)(ii): Interstate and international
pollution abatement.
Section 110(a)(2)(E): Adequate resources and authority,
conflict of interest, and oversight of local and regional government
agencies.
Section 110(a)(2)(F): Stationary source monitoring and
reporting.
Section 110(a)(2)(G): Emergency episodes.
Section 110(a)(2)(H): SIP revisions.
Section 110(a)(2)(J): Consultation with government
officials, public notification, PSD, and visibility protection.
Section 110(a)(2)(K): Air quality modeling and submittal
of modeling data.
Section 110(a)(2)(L): Permitting fees.
Section 110(a)(2)(M): Consultation/participation by
affected local entities.
There are certain infrastructure SIP requirements under section
110(a)(2) that are not addressed in this final action. First, two
elements identified in section 110(a)(2) are not governed by the three-
year submittal deadline of section 110(a)(1). These two elements are:
(i) section 110(a)(2)(C), to the extent that it refers to permit
programs required under part D (nonattainment new source review (NSR)),
and (ii) section 110(a)(2)(I), pertaining to the nonattainment planning
requirements of part D. As a result, this action does not address the
nonattainment NSR requirements of section 110(a)(2)(C) or the entirety
of section 110(a)(2)(I). Additionally, this action does not address the
requirements of section 110(a)(2)(D)(i)(I) pertaining to contributions
to nonattainment or interference with maintenance in other States,
referred to as ``prongs 1 and 2'' and 110(a)(2)(D)(i)(II) pertaining to
interference with visibility protection in other States, referred to as
``prong 4.'' The EPA has proposed action on Arizona's SIP revision with
respect to prongs 1 and 2 in a separate rulemaking,\1\ and has
finalized action on prong 4 in a separate rulemaking.\2\ Finally, there
are several requirements, for which we originally proposed partial
approval and partial disapproval,\3\ that we will now be deferring
action on. These include the requirements of 110(a)(2)(C) as they
relate to major source preconstruction PSD permitting, but also extend
to the portions of 110(a)(2)(D)(i), 110(a)(2)(D)(ii), and 110(a)(2)(J)
that reference PSD requirements and rely on our analysis of PSD
permitting in Element C. We will be addressing the PSD requirements of
110(a)(2)(C), 110(a)(2)(D)(i), 110(a)(2)(D)(ii), and 110(a)(2)(J) in a
separate, future rulemaking.
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\1\ 90 FR 48502 (October 23, 2025).
\2\ The EPA finalized its partial approval and partial
disapproval the Arizona Regional Haze Plan for the Second
Implementation Period as well as its disapproval of prong 4
requirements on May 31, 2024 (89 FR 102744). On July 15, 2025, EPA
granted petitions for reconsideration of our final action on the
Arizona Regional Haze Plan.
\3\ 89 FR 50245, 50249-50250 (June 13, 2024).
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B. State Submittals
The Arizona Department of Environmental Quality (ADEQ) submitted
two SIP revisions to address the infrastructure SIP requirements in CAA
sections 110(a)(1) and 110(a)(2) for the 2012 PM2.5 NAAQS.
On December 11, 2015, ADEQ submitted the ``Arizona State Implementation
Plan Revision for the 2012 Fine Particulate Matter (PM2.5)
National Ambient Air Quality Standard'' (``2015 PM2.5 I-SIP
submittal'').\4\ On February 10, 2022, ADEQ submitted the ``State
Implementation Plan Revision: Clean Air Act Section 110(a)(2) for the
2012 Fine Particulate & 2015 Ozone NAAQS'' (``2022 I-SIP
supplement'').\5\ These submittals collectively address Arizona's
obligation to satisfy infrastructure SIP requirements for the 2012
PM2.5 NAAQS. We refer to them herein as ``Arizona's 2012
PM2.5 I-SIP submittals.''
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\4\ Letter dated December 11, 2015, from Eric Massey, Director,
Air Quality Division, ADEQ, to Jared Blumenfeld, Regional
Administrator, EPA Region IX, Subject: ``Arizona Infrastructure
State Implementation Plan for the 2012 PM2.5 National
Ambient Air Quality Standards.''
\5\ Letter dated February 10, 2022, from Daniel Czecholinski,
Director, Air Quality Division, ADEQ, to Martha Guzman, Regional
Administrator, EPA Region IX, Subject: ``Submittal of the Arizona
State Implementation Plan Revision under Clean Air Act Sections
110(a)(2) for the 2012 Fine Particulate and the 2015 Ozone NAAQS.''
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We are taking final action on these submittals with respect to the
2012 PM2.5 NAAQS except for those portions of the 2012
PM2.5 I-SIP submittals addressing prongs 1, 2, and 4 of the
interstate transport requirements under CAA section 110(a)(2)(D)(i).
Additionally, we are deferring action on the requirements under CAA
section
[[Page 59053]]
110(a)(2)(C), 110(a)(2)(D)(i), 110(a)(2)(D)(ii), and 110(a)(2)(J) with
respect to the major source PSD requirements referenced within those
elements. Our deferral on these sub-elements extends to all Arizona
permitting agencies. We are also not taking action on the portions of
the 2022 I-SIP supplement addressing the 2015 ozone NAAQS in this
rulemaking.
C. Summary of EPA's Proposal and Incorporation of Rules Into Arizona's
State Implementation Plan
We evaluated Arizona's 2012 PM2.5 I-SIP submittals and
the existing provisions of the Arizona SIP for compliance with the
infrastructure SIP requirements of CAA section 110(a)(2) and the
applicable regulations in 40 CFR part 51 (``Requirements for
Preparation, Adoption, and Submittal of State Implementation Plans'').
Based on the evaluation presented in the June 13, 2024 proposed
rulemaking and in the accompanying technical support document (TSD), we
proposed to partially approve and partially disapprove Arizona's 2012
PM2.5 I-SIP submittals with respect to the 2012
PM2.5 NAAQS.\6\ Additionally, we proposed to approve two
rules and one plan submitted with the 2022 I-SIP supplement: the
revised Maricopa County Air Pollution control Regulation VI--Emergency
Episodes ``Rule 600 Emergency Episodes,'' \7\ the revised Arizona
Administrative Code (AAC) R18-2-220 ``Air Pollution Emergency
Episodes,'' and the ``Procedures for the Prevention of Emergency
Episodes.'' \8\ Also submitted with the 2022 I-SIP supplement are the
Arizona Revised Statute (ARS) 49-432(C), dealing with public
availability of emissions records, and Pima County Code (PCC) 17.24.010
``Confidentiality of trade secrets, sales data, and propriety
information.'' \9\ The EPA took final action to approve the revised ARS
49-432 and PCC 17.24.010 for incorporation into the Arizona SIP in a
separate rulemaking.\10\ Based upon the analysis detailed in our
proposed rulemaking and TSD, we find that Maricopa County Regulation
VI--Emergency Episodes, Rule 600 ``Emergency Episodes,'' AAC R18-2-220
``Air Pollution Emergency Episodes,'' and the ``Procedures for the
Prevention of Emergency Episodes,'' meet the requirements of CAA
section 110(a)(2)(G) and other CAA requirements. Therefore, the EPA is
approving the revised versions of Maricopa County Regulation VI--
Emergency Episodes, Rule 600 ``Emergency Episodes,'' AAC R18-2-220
``Air Pollution Emergency Episodes,'' and the ``Procedures for the
Prevention of Emergency Episodes'' into the Arizona SIP.
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\6\ 89 FR 50245 (June 13, 2024).
\7\ Prior to ADEQ's submittal of Maricopa County's Regulation
VI--Emergency Episodes, Rule 600 ``Emergency Episodes'' with the
2022 I-SIP supplement on February 10, 2022, ADEQ submitted the same
rule as a standalone submission on December 17, 2021. We have
determined the content of these two submittals to be identical to
one another. Therefore, we are choosing to fulfill our statutory
obligation to act on the rule by approving the submission included
as part of the 2022 I-SIP supplement. Furthermore, ADEQ, prompted by
a request from Maricopa County Air Quality Department, has withdrawn
the December 17, 2021 rule submittal, included in the docket for
this rulemaking.
\8\ ADEQ's ``Procedures for the Prevention of Emergency
Episodes'' is located in Appendix D to the 2022 I-SIP supplement.
\9\ In our notice of proposed rulemaking, we made a
typographical error and referred to the Pima County Code 17.24.010
as the Pinal County Code 17.24.010.
\10\ 89 FR 71830 (September 4, 2024).
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D. Revising Air Quality Control Regions and Evaluating Emergency
Episode Planning Requirements for PM2.5 in Arizona
40 CFR part 51, subpart H (``Prevention of Air Pollution Emergency
Episodes'') contains EPA's implementing regulations for CAA section
110(a)(2)(G) (Sec. Sec. 51.150 through 51.153). 40 CFR 51.150 of
subpart H provides criteria for the classification of areas for
emergency episode planning purposes based on measured concentrations of
ambient air pollutants, specifically sulfur oxides, particulate matter,
carbon monoxide, nitrogen dioxide, and ozone. The priority thresholds
for classification of AQCR are listed at 40 CFR 51.150, and the
specific classifications of AQCR in Arizona are listed at 40 CFR
52.121. Consistent with the provisions of 40 CFR 51.153,
reclassification of an AQCR must rely on the most recent three years of
air quality data. Under 40 CFR 51.151 and 51.152, regions classified
under the more stringent classifications of Priority I, IA, or II are
required to have SIP-approved emergency episode contingency plans,
while those classified Priority III are not required to have plans. We
also interpret 40 CFR 51.153 as establishing the means for states to
review air quality data and request a higher or lower classification
for any given region and as providing the regulatory basis for the EPA
to reclassify such regions, as appropriate, under the authorities of
CAA sections 110(a)(2)(G) and 301(a)(1). For reasons detailed in our
notice of proposed rulemaking and the TSD, we determined that counties
in the Maricopa Intrastate AQCR are required to have emergency episode
plans for PM2.5. ADEQ and Maricopa County both regulate air
quality in the Maricopa Intrastate AQCR and as covered in our notice of
proposed rulemaking, both counties have submitted emergency episode
plans. As detailed in our proposal and associated TSD, we find that
these plans satisfy the requirements of 110(a)(2)(G) of the CAA and 40
CFR part 51, subpart H.
We also proposed a revision to 40 CFR 52.121 to add La Paz County
to the list of constituent counties for the Mohave-Yuma Intrastate
AQCR, and to 40 CFR 81.268, we proposed to add La Paz County to the
delimited area of the Mohave-Yuma Intrastate AQCR.\11\ This action
finalizes those amendments to 40 CFR 51.121 and 40 CFR 81.268 as
proposed.
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\11\ The EPA has discussed the basis for these proposed
amendments to 40 CFR 52.121 and 40 CFR 81.268 with ADEQ and the
State's concurrence and formal request for these revisions is
included as a letter in the docket for this rulemaking with our
notice of final action. See letter from Daniel Czecholinkski,
Director, ADEQ Air Quality Division, to Matthew Lakin, Director, EPA
Region IX Air and Radiation Division, dated Augst 27, 2024.
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II. Public Comments and EPA Responses
The EPA's proposed action provided a 30-day public comment period
that ended on July 15, 2024. During this period, the EPA received four
comments. Three of these comments were from the Center for Biological
Diversity (CBD) and the remaining comment was from another
organization. Copies of each comment have been added to the docket for
this action and are accessible at https://www.regulations.gov. The
three comments from CBD concerned ADEQ's PSD permitting program.
Because we are deferring action on the PSD-related elements of
Arizona's 2012 PM2.5 I-SIP submittal, we are not responding
to those comments at this time. Below we summarize the remaining
comment and provide our response.
One comment from a different organization argued that the EPA's
review of infrastructure SIP submittals for the 2012 PM2.5
NAAQS should include considerations for the emissions caused by the
smoking of marijuana and cannabis, and the emissions associated with
their production. Additionally, the comment requested that the EPA also
add marijuana and cannabis to the ``toxic substance list.'' \12\
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\12\ The full comment is included in the docket for this
rulemaking.
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After reviewing the comment, the EPA has determined that the
comment fails to raise issues germane to the
[[Page 59054]]
proposed action of the revisions submitted by the State of Arizona
pursuant to the CAA requirements for the implementation, maintenance,
and enforcement of the 2012 p.m.2.5 NAAQS, which is based on
the statutory requirements of CAA sections 110(a)(1) and 110(a)(2).
Therefore, we have determined that this comment does not necessitate a
response to the issues raised, and the EPA will not provide a response
to the comment in this document.
III. Final Action
A. Approvals
As detailed in section I. of this rulemaking, we are taking final
action to approve certain portions of Arizona's I-SIP submittals for
the 2012 PM2.5 NAAQS. Specifically, we are approving the
submittal for the requirements of the following CAA sections:
110(a)(2)(A)--Emission limits and other control measures.
110(a)(2)(B)--Ambient air quality monitoring/data system.
110(a)(2)(C)--Program for enforcement of control measures
and regulation of new and modified minor stationary sources.
110(a)(2)(D)(ii)--International pollution abatement, CAA
section 115.
110(a)(2)(E)--Adequate resources and authority, conflict
of interest, and oversight of local governments and regional agencies.
110(a)(2)(F)--Stationary source monitoring and reporting.
110(a)(2)(G)--Emergency episodes.
110(a)(2)(H)--Consultation with government officials.
110(a)(2)(J)--Consultation with government officials,
public notification, and visibility protection.
110(a)(2)(K)--Air quality modeling and submission of
modeling data.
110(a)(2)(L)--Permitting fees.
110(a)(2)(M)--Consultation/participation by affected local
entities.
B. Deferred Action
The EPA previously proposed to partially approve and partially
disapproval the following PSD-related CAA requirements under 110(a)(2).
At this time, we are not finalizing our proposed action on these
elements and will instead address the requirements in a separate
rulemaking:
110(a)(2)(C)--Program for regulation of new and modified
major source stationary sources.
110(a)(2)(D)(i)(II)--Interference with PSD (prong 3).
110(a)(2)(D)(ii)--Interstate pollution abatement, CAA
section 126.
110(a)(2)(J)--PSD.
We note that the EPA proposed to approve prongs 1 and 2 of
110(a)(2)(D)(i)(I) in a separate rulemaking.\13\ We took final action
to disapprove prong 4 of 110(a)(2)(D)(i)(II) as part of a larger action
addressing Arizona's Regional Haze requirements for the second
implementation period.\14\
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\13\ 90 FR 48502 (October 23, 2025).
\14\ 89 FR 102744 (December 18, 2024). As previously noted, on
July 15, 2025, EPA granted petitions for reconsideration of our
final action on the Arizona Regional Haze plan.
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C. Incorporation of Rules Into Arizona's State Implementation Plan
For the reasons described in our proposed rulemaking and TSD, we
are finalizing approval of two rules and one plan included with the
2022 I-SIP supplement into the Arizona SIP: AAC R18-2-220 ``Air
Pollution Emergency Episodes,'' the accompanying plan ``Procedures for
the Prevention of Emergency Episodes,'' and the Maricopa County Air
Pollution Control Regulation VI, ``Emergency Episodes: Rule 600
Emergency Episodes''. Based on our analysis, we find that these rules
meet the requirements of CAA sections 110(a)(2), 110(l), and 193.
D. Revising Air Quality Control Regions and Evaluating Emergency
Episode Planning Requirements for PM2.5 in Arizona
For the reasons described in our proposed rulemaking, and in
response to the State's request, we are taking final action to revise
40 CFR 52.121 to add La Paz County to the list of constituent counties
for the Mohave-Yuma Intrastate AQCR, and to 40 CFR 81.268, to add La
Paz County to the delimited area of the Mohave-Yuma Intrastate
AQCR.\15\ We also evaluated the three most recent years of complete,
quality-assured, and certified ambient air monitoring data to yield
maximum 24-hour PM2.5 concentrations for each county; \16\
the maximum recorded 24-hour PM2.5 concentrations along with
our finalized classifications for each AQCR are compiled in table 16 of
the TSD accompanying this rulemaking. As discussed in our proposed
rulemaking document, ADEQ and Maricopa County have both submitted
emergency episode plans, and we are taking final action to find that
these plans satisfy the requirements of 40 CFR 51.152(a)-(b) and
110(a)(2)(G) of the CAA.
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\15\ 89 FR 50245 (June 13, 2024).
\16\ EPA AQS Daily Summary Report, AMP435, for 2020-2022 24-Hour
PM2.5 Values for Arizona. Report accessed July 31, 2023,
included in the docket for this rulemaking.
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IV. Incorporation by Reference
In this document, the EPA is finalizing regulatory text that
includes incorporation by reference. The EPA is finalizing the
incorporation of AAC R18-2-220 ``Air Pollution Emergency Episodes,''
the ``Procedures for the Prevention of Emergency Episodes,'' and the
Maricopa County Air Pollution Control Regulation VI, ``Emergency
Episodes: Rule 600 Emergency Episodes,'' into the Arizona SIP, which
are incorporated by reference in accordance with the requirements of 1
CFR part 51. The EPA has made, and will continue to make, these
documents available through https://www.regulations.gov and at the EPA
Region 9 Office (please contact the person identified in the FOR
FURTHER INFORMATION CONTACT section of this preamble for more
information).
V. Statutory and Executive Order Reviews
Under the CAA, the Administrator is required to approve a SIP
submission that complies with the provisions of the Act 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:
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);
Is not subject to Executive Order 14192 (90 FR 9065,
February 6, 2025) because SIP actions are exempt from review under
Executive Order 12866;
Does not impose an information collection burden under the
provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.);
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.);
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);
Does not have federalism implications as specified in
Executive Order 13132 (64 FR 43255, August 10, 1999);
Is not subject to Executive Order 13045 (62 FR 19885,
April 23, 1997)
[[Page 59055]]
because it proposes to approve a state program;
Is not a significant regulatory action subject to
Executive Order 13211 (66 FR 28355, May 22, 2001); and
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 rule 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).
This action is subject to the Congressional Review Act (CRA), and
the EPA will submit a rule report to each House of the Congress and to
the Comptroller General of the United States. This action is not a
``major rule'' as defined by 5 U.S.C. 804(2).
Under section 307(b)(1) of the CAA, petitions for judicial review
of this action must be filed in the United States Court of Appeals for
the appropriate circuit by February 17, 2026. Filing a petition for
reconsideration by the Administrator of this final rule does not affect
the finality of this action for the purposes of judicial review nor
does it extend the time within which a petition for judicial review may
be filed, and shall not postpone the effectiveness of such rule or
action. This action may not be challenged later in proceedings to
enforce its requirements (see section 307(b)(2)).
List of Subjects
40 CFR Part 52
Environmental protection, Air pollution control, Incorporation by
reference, Intergovernmental relations, Nitrogen dioxide, Particulate
matter, Reporting and recordkeeping requirements, Volatile organic
compounds.
40 CFR Part 81
Environmental protection, Air pollution control.
Authority: 42 U.S.C. 7401 et seq.
Dated: December 8, 2025.
Michael Martucci,
Acting Regional Administrator, Region IX.
For the reasons stated in the preamble, EPA amends 40 CFR parts 52
and 81 as follows:
PART 52--APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS
0
1. The authority citation for part 52 continues to read as follows:
Authority: 42 U.S.C. 7401 et seq.
Subpart D--Arizona
0
2. In Sec. 52.120:
0
a. The table in paragraph (c) entitled ``Table 2--EPA-Approved Arizona
Regulations'' is amended by:
0
i. Under the heading ``Article 2 (Ambient Air Quality Standards; Area
Designations; Classifications)'', revising the entry ``R18-2-220''.
0
ii. Revising the entry for ``[Incorporated by Reference through R18-2-
220]''.
0
b. The table in paragraph (c) entitled ``Table 4 to Paragraph (c)--EPA-
Approved Maricopa County Air Pollution Control Regulations'' is amended
by:
0
i. Under the heading ``Regulation VI--Emergency Episodes'', revising
the entry ``Rule 600''.
0
c. The table in paragraph (e) entitled ``Table 1--EPA-Approved Non-
Regulatory and Quasi-Regulatory Measures [Excluding Certain Resolutions
and Statutes, Which are Listed in Tables 2 and 3, Respectively]'' is
amended by:
0
i. Under the heading ``Clean Air Act Section 110(a)(2) State
Implementation Plan Elements (Excluding Part D Elements and Plans)'',
adding the entry '' Arizona State Implementation Plan Revision for the
2012 Fine Particulate Matter (PM2.5) National Ambient Air
Quality Standard (dated December 11, 2015)'' before the entry ``Arizona
State Implementation Plan Revision under Clean Air Act Section
110(a)(1) and 110(a)(2) for the 2015 Ozone National Ambient Air Quality
Standards (dated September 24, 2018)''.
The revisions and addition read as follows:
Sec. 52.120 Identification of plan.
* * * * *
(c) * * *
Table 2--EPA-Approved Arizona Regulations
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Additional
State citation Title/subject State effective date EPA approval date explanation
----------------------------------------------------------------------------------------------------------------
* * * * * * *
----------------------------------------------------------------------------------------------------------------
Article 2 (Ambient Air Quality Standards; Area Designations; Classifications)
----------------------------------------------------------------------------------------------------------------
* * * * * * *
R18-2-220...................... Air Pollution May 18, 2019.......... 12/18/2025, 90 FR Submitted on
Emergency [insert Federal February 10,
Episodes. Register page 2022.
where the
document begins].
* * * * * * *
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Materials Incorporated By Reference in Title 18 (Environmental Quality)
Chapter 2 (Department of Environmental Quality Air Pollution Control)
----------------------------------------------------------------------------------------------------------------
* * * * * * *
[Incorporated by reference Procedures for May 18, 2019.......... 12/18/2025, 90 FR Submitted on
through R18-2-220]. Prevention of [insert Federal February 10,
Emergency Register page 2022.
Episodes. where the
document begins].
[[Page 59056]]
* * * * * * *
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* * * * *
Table 4 to Paragraph (c)--EPA-Approved Maricopa County Air Pollution Control Regulations
----------------------------------------------------------------------------------------------------------------
EPA approval
County citation Title/subject State effective date date Explanation
----------------------------------------------------------------------------------------------------------------
* * * * * * *
----------------------------------------------------------------------------------------------------------------
Regulation VI--Emergency Episodes
----------------------------------------------------------------------------------------------------------------
Rule 600............... Emergency Episodes....... December 8, 2021......... 12/18/2025, 90 Submitted on
FR [insert February 10,
Federal 2022.
Register page
where the
document
begins].
* * * * * * *
----------------------------------------------------------------------------------------------------------------
* * * * *
(e) * * *
Table 1--EPA-Approved Non-Regulatory and Quasi-Regulatory Measures
[Excluding certain resolutions and statutes, which are listed in Tables 2 and 3, respectively] \1\
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Applicable geographic or
Name of SIP provision nonattainment area or title/ State submittal date EPA approval date Explanation
subject
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* * * * * * *
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Clean Air Act Section 110(a)(2) State Implementation Plan Elements (Excluding Part D Elements and Plans)
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* * * * * * *
Arizona State Implementation Plan State-wide...................... December 11, 2015............... 12/18/2025, 90 FR Adopted by the Arizona
Revision for the 2012 Fine [insert Federal Department of
Particulate Matter (PM2.5) National Register page where Environmental Quality
Ambient Air Quality Standard (dated the document begins]. on December 11, 2015.
December 11, 2015). EPA fully approved
all elements of the
submittal, except we
are deferring action
on the PSD-related
requirements of CAA
sections
110(a)(2)(C),
110(a)(2)(D), and
110(a)(2)(J).
* * * * * * *
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\1\ Table 1 is divided into three parts: Clean Air Act Section 110(a)(2) State Implementation Plan Elements (excluding Part D Elements and Plans), Part
D Elements and Plans (other than for the Metropolitan Phoenix or Tucson Areas), and Part D Elements and Plans for the Metropolitan Phoenix and Tucson
Areas.
* * * * *
0
3. In Sec. 52.121, the table is amended by revising the entry
``Mohave-Yuma Intrastate (Mohave, Yuma)'' to read as follows:
Sec. 52.121 Classification of regions.
* * * * *
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Classifications
AQCR (constituent counties) ---------------------------------------------------------------------
PM SOX NO2 CO O3
----------------------------------------------------------------------------------------------------------------
* * * * * * *
Mohave-Yuma Intrastate (La Paz, Mohave, I III III III III
Yuma)....................................
* * * * * * *
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[[Page 59057]]
0
4. In Sec. 52.123, add paragraph (s) to read as follows:
Sec. 52.123 Approval status.
* * * * *
(s) 2012 PM2.5 NAAQS: The SIPs submitted on December 11, 2015, and
February 10, 2022, are fully approved except for the PSD-related
requirements of CAA sections 110(a)(2)(C), (D)(i)(II), (D)(ii), and
(J), which we are deferring action on, for all portions of the Arizona
SIP.
* * * * *
PART 81--DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
0
5. The authority citation for part 81 continues to read as follows:
Authority: 42 U.S.C. 7401, et seq.
Subpart B--Designation of Air Quality Control Regions
0
6. Revise Sec. 81.268 to read as follows:
Sec. 81.268 Mohave-Yuma Intrastate Air Quality Control Region.
The Mohave-Yuma Intrastate Air Quality Control Region (Arizona) has
been revised to consist of the territorial area encompassed by the
boundaries of the following jurisdictions or described area (including
the territorial area of all municipalities (as defined in section
302(f) of the Clean Air Act, 42 U.S.C. 7602(f)) geographically located
within the outermost boundaries of the area so delimited): In the State
of Arizona: La Paz County, Mohave County, and Yuma County
[FR Doc. 2025-23259 Filed 12-17-25; 8:45 am]
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