Rule2025-17486
Air Plan Approval; Wyoming; R-35 Wyoming Air Quality Standards and Regulations Rule Package
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
September 11, 2025
Effective
November 10, 2025
Issuing agencies
Environmental Protection Agency
Abstract
The Environmental Protection Agency (EPA) is taking direct final action to approve revisions to the Wyoming State Implementation Plan (SIP) submitted by the Wyoming Department of Environmental Quality (WDEQ) on December 16, 2024. WDEQ requested the EPA approve the revised rules for Chapters 2, 3, 4, 8, and 14 in the Wyoming Air Quality Standards and Regulations (WAQSR). The revised rules include non- substantive updates to rule language that ensure consistent grammar, formatting, and written clarity as well as updated references to the Code of Federal Regulations (CFR). The EPA is taking this action pursuant to the Clean Air Act (CAA).
Full Text
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<title>Federal Register, Volume 90 Issue 174 (Thursday, September 11, 2025)</title>
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[Federal Register Volume 90, Number 174 (Thursday, September 11, 2025)]
[Rules and Regulations]
[Pages 43915-43919]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-17486]
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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 52
[EPA-R08-OAR-2025-0204; FRL-12942-02-R8]
Air Plan Approval; Wyoming; R-35 Wyoming Air Quality Standards
and Regulations Rule Package
AGENCY: Environmental Protection Agency (EPA).
ACTION: Direct final rule.
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SUMMARY: The Environmental Protection Agency (EPA) is taking direct
final action to approve revisions to the Wyoming State Implementation
Plan (SIP) submitted by the Wyoming Department of Environmental Quality
(WDEQ) on December 16, 2024. WDEQ requested the EPA approve the revised
rules for Chapters 2, 3, 4, 8, and 14 in the Wyoming Air Quality
Standards and Regulations (WAQSR). The revised rules include non-
substantive updates to rule language that ensure consistent grammar,
formatting, and written clarity as well as updated references to the
Code of Federal Regulations (CFR). The EPA is taking this action
pursuant to the Clean Air Act (CAA).
DATES: This direct final rule is effective on November 10, 2025,
without further notice, unless the EPA receives adverse comments by
October 14, 2025. If adverse comments are received, the EPA will
publish a timely withdrawal of the direct final rule in the Federal
Register informing the public that the rule will not take effect.
ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R08-
OAR-2025-0204, to the Federal Rulemaking Portal: <a href="https://www.regulations.gov">https://www.regulations.gov</a>. Follow the online instructions for submitting
comments. Once submitted, comments cannot be edited or removed from
<a href="https://www.regulations.gov">https://www.regulations.gov</a>. The EPA may publish any comment received
to its public docket. Do not submit electronically any information you
consider to be Confidential Business Information (CBI) 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 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, the full EPA public comment
policy, information about CBI 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>.
Docket: The EPA has established a docket for this action under
Docket ID No. EPA-R08-OAR-2025-0204. All documents in the docket are
listed on the <a href="https://www.regulations.gov">https://www.regulations.gov</a> website. Although listed in
the index, some information is not publicly available, e.g., 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 <a href="https://www.regulations.gov">https://www.regulations.gov</a>, or please contact the person identified in the FOR
FURTHER INFORMATION CONTACT section for additional availability
information.
FOR FURTHER INFORMATION CONTACT: Chelsea Cancino, Air and Radiation
Division, EPA, Region 8, Mailcode 8ARD-IO, 1595 Wynkoop Street, Denver,
Colorado 80202-1129, telephone number: (303) 312-6276, email address:
<a href="/cdn-cgi/l/email-protection#6003010e03090e0f4e0308050c130501200510014e070f16"><span class="__cf_email__" data-cfemail="5d3e3c333e343332733e3538312e383c1d382d3c733a322b">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION: Throughout this document ``we,'' ``us,'' and
``our'' means the EPA.
I. Background
WDEQ reviewed its regulations and concluded that rule revisions
were needed to modify the wording of selected text to correct
typographical errors and reflect new formatting guidelines. WDEQ
adopted these various minor revisions and updated their rules on April
30, 2024, and then requested that the EPA approve these revisions into
the Wyoming SIP in a submittal dated December 16, 2024.
II. The EPA's Evaluation
WDEQ has requested that the EPA approve revised rules under Chapter
2, 3, 4, 8, and 14 of the WAQSR. These revisions adopt minor changes in
rule language to meet updated state style and formatting guidelines.
These revisions also include Incorporation by Reference (IBR) material
in Wyoming's SIP. IBR allows state agencies to comply with the
requirement to adopt certain Federal rules by referring to materials
already published in the CFR. In this SIP revision, Wyoming is
incorporating by reference 40 CFR parts 50, 51, 53, 60, 81, and 93 as
published on July 1, 2023. No terms or definitions were added or
removed from the revised sections. Since the revisions are minor in
nature, do not make this rule less stringent, and do not affect the
scope or intent of the rules, the EPA finds that the revisions to these
chapters are approvable.
With regard to the approval of WAQSR Chapter 02, Section 04,
``Ambient Standards for Sulfur Oxides,'' we note that the December 16,
2024 submittal supersedes the revisions to this section contained in
WDEQ's February 10, 2014 SIP submittal that the EPA had not previously
acted on.\1\
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\1\ See 80 FR 45608, July 31, 2015, in which the EPA did not act
on the State's proposed revisions to WAQSR Chapter 02, Section
04(a), 4(a)(i) and 4(a)(ii). These provisions are removed from
Chapter 02, Section 04 as submitted December 16, 2024, and the EPA
considers this submittal to supersede that of February 10, 2014.
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III. Final Action
The EPA is approving the December 16, 2024, submission by WDEQ as a
revision to the Wyoming SIP. Specifically, the EPA is approving updates
to WAQSR Chapters 2, 3, 4, 8, and 14 as detailed in table 1 below.
We are publishing this action without a prior proposed rule because
we view these SIP revisions as noncontroversial and anticipate no
relevant adverse comment. The revisions are administrative in nature
and do not constitute substantive changes to Wyoming's SIP. However, in
the ``Proposed Rules'' section of this Federal Register publication, we
are publishing a separate action to approve the revisions to Wyoming's
SIP submitted by the WDEQ on December 16, 2024 if adverse comments are
received on this direct final rule. We will not institute a second
comment period on this action. Any parties interested in commenting
must do so at this time. For further information about commenting on
this rule, see the ADDRESSES section of this document.
If the EPA receives adverse comment, we will publish a timely
withdrawal in the Federal Register informing the public that this
direct final rule, or the relevant provisions of this rule, will not
take effect. We would address all public comments in any subsequent
final rule based on the proposed rule. If we receive adverse comment on
a distinct provision of this rulemaking, we will publish a timely
withdrawal in the
[[Page 43916]]
Federal Register indicating which provisions we are withdrawing. The
provisions that are not withdrawn will become effective on the date set
out above, notwithstanding adverse comment on any other provision.
Table 1--EPA's Evaluation
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Rule No. Rule title Revision summary EPA's proposed action
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Chapter 02. Ambient Standards
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Section 02..................... Ambient Standards for Non-substantive Approval.
Particulate Matter. formatting revisions.
Section 03..................... Ambient Standards for Non-substantive Approval.
Nitrogen Oxides. formatting revisions.
Section 04..................... Ambient Standards for Non-substantive Approval.
Sulfur Oxides. formatting revisions.
Section 05..................... Ambient Standards for Non-substantive Approval.
Carbon Monoxide. formatting revisions.
Section 06..................... Ambient Standards for Non-substantive Approval.
Ozone. formatting revisions.
Section 08..................... Ambient Standards for Non-substantive Approval.
Suspended Sulfates. formatting revisions.
Section 10..................... Ambient Standards for Non-substantive Approval.
Lead. formatting revisions.
Section 12..................... Incorporation by Updated adoption of the Approval.
Reference. CFR as of July 1, 2023
and associated weblink.
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Chapter 03. General Emission Standards
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Section 02..................... Emission Standards for Non-substantive Approval.
Particulate Matter. formatting revisions.
Section 03..................... Emission Standards for Non-substantive Approval.
Nitrogen Oxides. formatting revisions.
Section 04..................... Emission Standards for Non-substantive Approval.
Sulfur Oxides. formatting revisions.
Section 05..................... Emission Standards for Non-substantive Approval.
Carbon Monoxide. formatting revisions.
Section 06..................... Emission Standards for Non-substantive Approval.
Volatile Organic formatting revisions.
Compounds.
Section 09..................... Incorporation by Updated adoption of the Approval.
Reference. CFR as of July 1, 2023
and associated weblink.
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Chapter 04. State Performance Standards for Specific Existing Sources
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Section 02..................... Existing Sulfuric Acid Non-substantive Approval.
Production Units. formatting revisions.
Section 03..................... Existing Nitric Acid Non-substantive Approval.
Manufacturing Plants. formatting revisions.
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Chapter 08. Non-attainment Area Regulations
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Section 02..................... Sweetwater County Non-substantive Approval.
Particulate Matter formatting revisions.
Regulations.
Section 03..................... Conformity of General Non-substantive Approval.
Federal Actions to formatting revisions.
State Implementation
Plans.
Section 05..................... Ozone Nonattainment Non-substantive Approval.
Emission Inventory Rule. formatting revisions.
Section 10..................... Incorporation by Updated adoption of the Approval.
Reference. CFR as of July 1, 2023
and associated weblink.
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Chapter 14. Emission Trading Program Regulations
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Section 2...................... Western Backstop Sulfur Non-substantive Approval.
Dioxide Trading Program. formatting revisions.
Section 3...................... Sulfur Dioxide Milestone Non-substantive Approval.
Inventory. formatting revisions.
App A.......................... WEB Chapter 14, Section Non-substantive Approval.
2 Monitoring Protocols. formatting revisions.
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IV. Incorporation by Reference
In this document, the EPA is finalizing regulatory text that
includes IBR. In accordance with requirements of 1 CFR 51.5, the EPA is
finalizing the IBR of WAQSR as described in section III. of this
preamble and as set forth below in the amendments set forth to 40 CFR
part 52. The EPA has made, and will continue to make, these materials
generally available through <a href="https://www.regulations.gov">https://www.regulations.gov</a> and at the EPA
Region 8 Office (please contact the person identified in the FOR
FURTHER INFORMATION CONTACT section of this preamble for more
information). Therefore, these materials have been approved by the EPA
for inclusion in the SIP, have been IBR by the EPA into that plan, are
fully federally enforceable under sections 110 and 113 of the CAA as of
the effective date of the final rulemaking of the EPA's approval, and
will be IBR in the next update to the SIP compilation.\2\
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\2\ 62 FR 27968 (May 22, 1997).
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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 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 subject to Executive Order 14192 (90 FR 9065,
February 6, 2025) because SIP actions are exempt from review 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.);
[[Page 43917]]
<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 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 November 10, 2025. 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 in 40 CFR Part 52
Environmental protection, Air pollution control, Carbon monoxide,
Greenhouse gases, Incorporation by reference, Intergovernmental
relations, Lead, Nitrogen dioxide, Ozone, Particulate matter, Reporting
and recordkeeping requirements, Sulfur oxides, Volatile organic
compounds.
Dated: August 29, 2025.
Cyrus M. Western,
Regional Administrator, Region 8.
For the reasons stated in the preamble, the Environmental
Protection Agency is amending title 40 CFR part 52 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 ZZ--Wyoming
0
2. In Sec. 52.2620, the table in paragraph (c) is amended by:
0
a. Under the heading ``Chapter 02. Ambien Standards'', revising the
entries ``Section 02'', ``Section 03'', ``Section 04'', ``Section 05'',
``Section 06'', ``Section 08'', ``Section 10'', ``Section 12'';
0
b. Under the heading ``Chapter 03. General Emission Standards'',
revising the entries ``Section 02'', ``Section 03'', ``Section 04'',
``Section 05'', ``Section 06'', ``Section 09'';
0
c. Under the heading ``Chapter 04. State Performance Standards for
Specific Existing Sources'', revising the entries ``Section 02'',
Section 03'';
0
d. Under the heading ``Chapter 08. Non-attainment Area Regulations'',
revising the entries ``Section 02'', ``Section 03'', ``Section 05'',
``Section 10''; and
0
e. Under the heading ``Chapter 14. Emission Trading Program
Regulations'', revising the entries ``Section 2'', ``Section 3'', and
``App A''.
The revisions read as follows:
Sec. 52.2620 Identification of plan.
* * * * *
(c) * * *
----------------------------------------------------------------------------------------------------------------
State EPA
Rule No. Rule title effective effective Final rule citation/ Comments
date date date
----------------------------------------------------------------------------------------------------------------
* * * * * * *
----------------------------------------------------------------------------------------------------------------
Chapter 02. Ambient Standards
----------------------------------------------------------------------------------------------------------------
Section 02............. Ambient Standards 4/30/2024 9/11/2025 90 FR [insert
for Particulate Federal Register
Matter. page where the
document begins],
9/11/2025.
* * * * * * *
Section 03............. Ambient Standards 4/30/2024 9/11/2025 90 FR [insert
for Nitrogen Federal Register
Oxides. page where the
document begins],
9/11/2025.
Section 04............. Ambient Standards 4/30/2024 9/11/2025 90 FR [insert
for Sulfur Oxides. Federal Register
page where the
document begins],
9/11/2025.
Section 05............. Ambient Standards 4/30/2024 9/11/2025 90 FR [insert
for Carbon Federal Register
Monoxide. page where the
document begins],
9/11/2025.
Section 06............. Ambient Standards 4/30/2024 9/11/2025 90 FR [insert
for Ozone. Federal Register
page where the
document begins],
9/11/2025.
Section 08............. Ambient Standards 4/30/2024 9/11/2025 90 FR [insert
for Suspended Federal Register
Sulfates. page where the
document begins],
9/11/2025.
[[Page 43918]]
Section 10............. Ambient Standards 4/30/2024 9/11/2025 90 FR [insert
for Lead. Federal Register
page where the
document begins],
9/11/2025.
Section 12............. Incorporation by 4/30/2024 9/11/2025 90 FR [insert
Reference. Federal Register
page where the
document begins],
9/11/2025.
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Chapter 03. General Emission Standards
----------------------------------------------------------------------------------------------------------------
Section 02............. Emission Standards 4/30/2024 9/11/2025 90 FR [insert
for Particulate Federal Register
Matter. page where the
document begins],
9/11/2025.
Section 03............. Emission Standards 4/30/2024 9/11/2025 90 FR [insert
for Nitrogen Federal Register
Oxides. page where the
document begins],
9/11/2025.
Section 04............. Emission Standards 4/30/2024 9/11/2025 90 FR [insert
for Sulfur Oxides. Federal Register
page where the
document begins],
9/11/2025.
Section 05............. Emission Standards 4/30/2024 9/11/2025 90 FR [insert
for Carbon Federal Register
Monoxide. page where the
document begins],
9/11/2025.
Section 06............. Emission Standards 4/30/2024 9/11/2025 90 FR [insert
for Volatile Federal Register
Organic Compounds. page where the
document begins],
9/11/2025.
Section 09............. Incorporation by 4/30/2024 9/11/2025 90 FR [insert
Reference. Federal Register
page where the
document begins],
9/11/2025.
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Chapter 04. State Performance Standards for Specific Existing Sources
----------------------------------------------------------------------------------------------------------------
Section 02............. Existing Sulfuric 4/30/2024 9/11/2025 90 FR [insert
Acid Production Federal Register
Units. page where the
document begins],
9/11/2025.
Section 03............. Existing Nitric 4/30/2024 9/11/2025 90 FR [insert
Acid Manufacturing Federal Register
Plants. page where the
document begins],
9/11/2025.
* * * * * * *
----------------------------------------------------------------------------------------------------------------
Chapter 08. Non-attainment Area Regulations
----------------------------------------------------------------------------------------------------------------
Section 02............. Sweetwater County 4/30/2024 9/11/2025 90 FR [insert
Particulate Matter Federal Register
Regulations. page where the
document begins],
9/11/2025.
Section 03............. Conformity of 4/30/2024 9/11/2025 90 FR [insert
General Federal Federal Register
Actions to State page where the
Implementation document begins],
Plans. 9/11/2025.
Section 05............. Ozone Nonattainment 4/30/2024 9/11/2025 90 FR [insert
Emission Inventory Federal Register
Rule. page where the
document begins],
9/11/2025.
Section 10............. Incorporation by 4/30/2024 9/11/2025 90 FR [insert
Reference. Federal Register
page where the
document begins],
9/11/2025.
* * * * * * *
----------------------------------------------------------------------------------------------------------------
Chapter 14. Emission Trading Program Regulations
----------------------------------------------------------------------------------------------------------------
Section 2.............. Western Backstop 4/30/2024 9/11/2025 90 FR [insert 90 FR [insert
Sulfur Dioxide Federal Register Federal Register
Trading Program. page where the page where the
document begins], document begins],
9/11/2025. 9/11/2025.
Section 3.............. Sulfur Dioxide 4/30/2024 9/11/2025 90 FR [insert 90 FR [insert
Milestone Federal Register Federal Register
Inventory. page where the page where the
document begins], document begins],
9/11/2025. 9/11/2025.
App A.................. Web Chapter 14, 4/30/2024 9/11/2025 90 FR [insert 90 FR [insert
Section 2 Federal Register Federal Register
Monitoring page where the page where the
Protocols. document begins], document begins],
9/11/2025. 9/11/2025.
* * * * * * *
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[FR Doc. 2025-17486 Filed 9-10-25; 8:45 am]
BILLING CODE 6560-50-P
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