Rule2026-06397

Air Plan Approval; Ohio; Muskingum River 2010 Sulfur Dioxide Redesignation and Maintenance Plan

Primary source

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Published
April 2, 2026
Effective
April 2, 2026

Issuing agencies

Environmental Protection Agency

Abstract

The Environmental Protection Agency (EPA) finds that the Muskingum River sulfur dioxide (SO<INF>2</INF>) nonattainment area, located in Center Township in Morgan County and Waterford Township in Washington County, Ohio, (hereafter referred to as "Muskingum River area") is attaining the 2010 SO<INF>2</INF> National Ambient Air Quality Standard (NAAQS). The EPA is acting in accordance with Ohio's March 31, 2025, request to redesignate the Muskingum River area from nonattainment to attainment for the 2010 SO<INF>2</INF> NAAQS because the request meets the statutory requirements for redesignation under the Clean Air Act (CAA). The EPA is also approving Ohio's maintenance plan for the area and Ohio's Director's Final Findings and Orders (DFFOs) issued to Globe Metallurgical, Inc. (Globe Metallurgical) on March 26, 2025, as part of Ohio's federally enforceable State Implementation plan (SIP).

Full Text

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<title>Federal Register, Volume 91 Issue 63 (Thursday, April 2, 2026)</title>
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[Federal Register Volume 91, Number 63 (Thursday, April 2, 2026)]
[Rules and Regulations]
[Pages 16558-16562]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-06397]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 52 and 81

[EPA-R05-OAR-2025-0165; FRL-12974-02-R5]


Air Plan Approval; Ohio; Muskingum River 2010 Sulfur Dioxide 
Redesignation and Maintenance Plan

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: The Environmental Protection Agency (EPA) finds that the 
Muskingum River sulfur dioxide (SO<INF>2</INF>) nonattainment area, 
located in Center Township in Morgan County and Waterford Township in 
Washington County, Ohio, (hereafter referred to as ``Muskingum River 
area'') is attaining the 2010 SO<INF>2</INF> National Ambient Air 
Quality Standard (NAAQS). The EPA is acting in accordance with Ohio's 
March 31, 2025, request to redesignate the Muskingum River area from 
nonattainment to attainment for the 2010 SO<INF>2</INF> NAAQS because 
the request meets the statutory requirements for redesignation under 
the Clean Air Act (CAA). The EPA is also approving Ohio's maintenance 
plan for the area and Ohio's Director's Final Findings and Orders 
(DFFOs) issued to Globe Metallurgical, Inc. (Globe Metallurgical) on 
March 26, 2025, as part of Ohio's federally enforceable State 
Implementation plan (SIP).

DATES: This final rule is effective on April 2, 2026.

ADDRESSES: The EPA has established a docket for this action under 
Docket ID No. EPA-R05-OAR-2025-0165. 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, i.e., 
Confidential Business Information (CBI), Proprietary Business 
Information (PBI), 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 either 
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 information.

FOR FURTHER INFORMATION CONTACT: Gina Harrison, Air and Radiation 
Division (AR18J), Environmental Protection Agency, Region 5, 77 West 
Jackson Boulevard, Chicago, Illinois 60604, telephone number: (312) 
353-6956, email address: <a href="/cdn-cgi/l/email-protection#751d1407071c061a1b5b121c1b14351005145b121a03"><span class="__cf_email__" data-cfemail="e48c8596968d978b8aca838d8a85a4819485ca838b92">[email&#160;protected]</span></a>.

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

I. Background

    On June 3, 2011, Ohio submitted its recommendations to the EPA to 
designate certain areas of the State as attainment, nonattainment, or 
unclassifiable for the 2010 SO<INF>2</INF> NAAQS. Ohio recommended that 
the area located in southeastern Ohio that includes Center Township in 
Morgan County and Waterford Township in Washington County, the 
Muskingum River area, be designated as nonattainment for the 2010 
SO<INF>2</INF> NAAQS. The EPA concurred with Ohio's analysis and, on 
August 15, 2013 (78 FR 47191), published a final action designating the 
Muskingum River area as nonattainment of the 2010 SO<INF>2</INF> NAAQS, 
effective October 4, 2013.
    Under section 192(a) of the CAA, States are also required to submit 
attainment plans to demonstrate that the respective areas will attain 
the NAAQS as expeditiously as practicable, but no later than five years 
from the effective date of designation. Ohio submitted statewide 
nonattainment area SIPs to the EPA on April 3, 2015, and October 13, 
2015, and submitted supplemental attainment plans for the Muskingum 
River area on June 24, 2020, July 28, 2022, and May 23, 2023. The EPA 
approved Ohio's attainment plan for the Muskingum River area on 
September 8, 2023 (88 FR 61969).
    On October 2, 2025 (90 FR 47686), the EPA proposed to redesignate 
the Muskingum River area from nonattainment to attainment for the 2010 
SO<INF>2</INF> NAAQS in accordance with Ohio's March 31, 2025, request. 
The EPA determined that the area is attaining the 2010 SO<INF>2</INF> 
NAAQS and that the improvement in air quality is due to permanent and 
enforceable SO<INF>2</INF> emission reductions in the area. The EPA 
also proposed to approve Ohio's maintenance plan, which is designed to 
ensure continued attainment of the 2010 SO<INF>2</INF> NAAQS. Finally, 
the EPA proposed to approve and incorporate by reference Ohio's DFFOs 
issued to Globe Metallurgical on March 26, 2025, which set forth 
emission limits and other requirements that will provide for attainment 
of the 2010 SO<INF>2</INF> NAAQS in this area.

II. Response to Public Comments

    The EPA received two adverse comments on this action. Summaries of 
the adverse comments and the EPA's responses are provided below. All 
comments submitted during the public comment period are available in 
the docket of this action.
    Comment: One commenter stated that the docket materials available 
to the public did not include the complete, machine-readable AERMOD/
AERMET/BPIPPRM input and output files, the meteorological data files 
used, or the underlying spreadsheets for the base-

[[Page 16559]]

year and projected inventories used in the maintenance demonstration.
    Response: The EPA notes the modeling report was provided in both 
the attainment plan (88 FR 61969) and the docket for this action. All 
supporting modeling and meteorological data files are available for 
public viewing via the Freedom of Information Act process, but 
typically aren't included in the dockets for these actions due to the 
large sizes of the files. Therefore, the EPA does not find the comment 
to warrant any changes to this action.
    Comment: Commenter states that the enforceability of the 
SO<INF>2</INF> reductions attributed to the retirement of the Muskingum 
River Power Plant requires documentation of the binding, federally 
enforceable instruments (e.g., enforceable permanent shutdown permits 
or SIP-approved rules/consent orders) that preclude restart without 
full New Source Review (NSR) and applicable limits. Commenter also 
states that if the maintenance demonstration relies on retirements or 
voluntary limits that are not yet codified as SIP provisions, that 
reliance cannot satisfy the ``permanent and enforceable'' requirement.
    Response: Unrelated to this present rulemaking, the Muskingum River 
Power Plant notified Ohio EPA of the permanent shutdown of all coal-
fired boilers effective May 31, 2015. Ohio's rule at Ohio 
Administrative Code (OAC) 3745-31-02 prohibits the installation or 
modification of new sources without obtaining appropriate permits. A 
new source is defined in Ohio's SIP at OAC rule 3745-31-01(N)(3) as any 
air contaminant source for which an owner or operator undertakes a 
continuing program of installation or modification. Modification is 
defined in Ohio's SIP at 3745-31-01(M)(10) as any physical change in, 
or change in the method of operation of any air contaminant source that 
results in an increase in the allowable emissions. The resumption of 
operations at the facility would constitute a change in the method of 
operation that qualified as a ``modification.'' The facility's title V 
permit-to-operate P0090944 was revoked effective May 31, 2015, and 
therefore, these reductions are permanent and enforceable.
    Regarding the comments related to the maintenance plan, the EPA 
finds that Ohio has appropriately fulfilled its maintenance plan 
obligations as required under CAA section 175A, 42 U.S.C. 7505A. To 
further clarify, the docket of this action contains Ohio's 
redesignation request, which outlines Ohio's requirements for 
verification of continued attainment and the requirements for 
maintenance demonstration under section 175A. The EPA determines that 
Ohio adequately fulfilled these requirements through commitments to 
annual emissions submittals that verify continued attainment of the 
2010 SO<INF>2</INF> NAAQS and review of the projected emissions 
inventory for the Muskingum River area.\1\
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    \1\ See 88 FR 61969.
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    Comment: Commenter asserts this action does not provide adequate 
factual basis to certify compliance with the Regulatory Flexibility Act 
(RFA). Commenter requests that the Agency perform an Initial Regulatory 
Flexibility Analysis (IRFA) or supply a revised 605(b) certification 
with a factual basis to support the conclusion that the action will not 
have a significant economic impact on small entities.
    Response: The RFA does not apply to this rulemaking because the EPA 
has certified that this rule will not have a significant economic 
impact on a substantial number of small entities. The regulatory 
analysis provisions of the RFA are only triggered by a threshold 
determination by the Agency that this rule will have a significant 
economic impact on a substantial number of small entities. This 
rulemaking does not impose any regulatory requirements beyond those 
imposed by State law. Because the Agency has certified this rule will 
not have a significant economic impact, section 603 and 604 of the RFA 
do not apply to this rulemaking. 5 U.S.C. 605(b).
    Comment: Commenter contends that the Agency did not provide 
sufficient explanation for how this action complies with the Unfunded 
Mandates Reform Act (UMRA). Commenter requests that the EPA provide 
analysis showing the absence of a qualifying Federal mandate.
    Response: With regard to the UMRA, the EPA has complied by making 
its own determination that this rule will not result in expenditures of 
$100M+, and therefore the Agency does not need to complete a statement 
under 2 U.S.C. 1532.
    Comment: Commenter requests that the Agency amend the record to 
explain the Executive Order 12866 significance determination in light 
of the redesignation's permitting and compliance implications.
    Response: The EPA has complied with E.O. 12866 by determining that 
this rulemaking is not a significant regulatory action as defined in 
E.O. 12866.
    Comment: Commenter asserts that the modeling analysis used to 
establish the area's background concentrations does not align with the 
most recent data available, thereby undermining the model's ability to 
demonstrate future attainment under current conditions.
    Response: Globe Metallurgical's October 2024 modeling report notes 
that the attainment demonstration modeling (May 2022) used the three-
year period of 2018-2020 of ambient air quality monitoring data for 
background concentrations from the Hackney, OH monitor (AQS Monitor ID 
39-115-0004). For the modeling presented in the October 2024 modeling 
report, the years of air monitoring data used for the background 
concentration were updated to the most recent three-year period of 
2021-2023 for the Hackney monitor at the time the modeling was 
conducted, which is the most recent period of data available prior to 
submittal of the modeling report.
    Comment: Commenter asserts that the period used to represent the 
facility's actual emission profile for the compliance demonstration is 
insufficient and potentially unrepresentative of current operations.
    Response: The EPA disagrees with commenter's statement. Modeled 
emissions used both allowable emissions as well as the most recently 
available actual emissions. Allowable emissions are determined by the 
source's design capacity as well as any controls and enforceable 
operating factors and are required for use as emissions inputs for 
dispersion modeling to determine attainment with a NAAQS.\2\ Modeled 
results were provided for both the allowable emissions and actual 
emissions scenarios, and both modeled emissions scenarios demonstrated 
that emissions would not exceed the 2010 SO<INF>2</INF> NAAQS. The use 
of allowable emissions in the modeling analysis is more conservative 
than the use of actual emissions data and indicates that with the more 
conservative emissions inputs the 2010 SO<INF>2</INF> NAAQS is still 
being maintained in the area. The ambient air monitoring data from the 
Globe monitor supports that the area is below the 2010 SO<INF>2</INF> 
NAAQS. Further, the April 2014 SO<INF>2</INF> Guidance also notes that 
a separate actuals-based modeling to support a redesignation request is 
not necessary if an attainment determination was made based on 
allowables-based modeling

[[Page 16560]]

and a demonstration of a fully implemented control strategy has been 
provided.\3\
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    \2\ EPA's Guidance for 1-Hour Sulfur Dioxide (SO<INF>2</INF>) 
Nonattainment Area State Implementation Plans (SIP) Submissions can 
be found at <a href="https://www.epa.gov/so2-pollution/guidance-1-hour-sulfur-dioxide-so2-nonattainment-area-state-implementation-plans-sip">https://www.epa.gov/so2-pollution/guidance-1-hour-sulfur-dioxide-so2-nonattainment-area-state-implementation-plans-sip</a>.
    \3\ April 2014 Guidance, pg. 63.
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    The actual emissions scenario used emission testing data from April 
2021 to April 2022. While this was not on a traditional calendar year 
basis (January 1-December 31), this is still a full year of data and 
would capture seasonal operational variability as well as peak seasonal 
demand. More recent emissions testing data was not available for use in 
the modeling analysis as testing is typically conducted in association 
with state title V permit renewals. Annual emissions inventory data 
that is reported to both the state and the EPA on an annual basis are 
not used for air dispersion modeling analysis.
    Comment: Commenter asserts that the record is currently incomplete 
regarding the approval of the non-default downwash modeling technique 
employed.
    Response: The Equivalent Building Downwash (EBD) parameters are not 
a non-default modeling approach; it is a source characterization study 
which does not require explicit regulatory pre-approval from the Model 
Clearinghouse and is not subject to requirements of section 3.2 of 40 
CFR part 41, appendix W: Guideline on Air Quality Models. Non-default 
modeling methodologies involve using non-regulatory models or non-
default (ALPHA or BETA) AERMOD options to conduct the modeling analysis 
as outlined in Section 3.2 of appendix W. In this case, the need to use 
refined building downwash parameters for the wind direction sectors 
between 240-290 degrees within AERMOD was due to the building downwash 
processor, BPIP-PRIME, calculating unrepresentative building downwash 
parameters for Shop 1.
    Furthermore, a protocol for the wind tunnel testing was reviewed 
and approved by both the Ohio EPA and the EPA. Ohio EPA reviewed the 
final EBD report and considered the inclusion of the source 
characterization of the building downwash parameters resulting from the 
wind tunnel testing within the redesignation package their final 
approval of the source characterization study and report. Similarly, 
the EPA reviewed the final EBD report included with Ohio EPA's 
redesignation package and considered the inclusion of the modeling 
analysis within the redesignation rule, which included the final EBD 
report and EBD parameters for the wind direction sectors 240-290 
degrees for Shop 1, the final approval of the EBD report for the source 
characterization study.
    As noted above, air modeling files were not included within the 
docket due to the large file sizes. All modeling input and output 
files, including meteorological input files, are available by request.

III. What action is the EPA taking?

    The EPA is redesignating the Muskingum River area from 
nonattainment to attainment for the 2010 SO<INF>2</INF> NAAQS in 
accordance with Ohio's March 31, 2025, request. The EPA determined the 
area is attaining the 2010 SO<INF>2</INF> NAAQS and that the 
improvement is due to permanent and enforceable SO<INF>2</INF> emission 
reductions in the area. The EPA is also approving Ohio's maintenance 
plan as part of Ohio's federally enforceable SIP to ensure the 
Muskingum River area will continue to maintain attainment of the 2010 
SO<INF>2</INF> NAAQS. Finally, the EPA is approving and incorporating 
by reference Ohio's DFFOs issued to Globe on March 26, 2025, which set 
forth emission limits and other requirements that will provide for 
attainment of the 2010 SO<INF>2</INF> NAAQS in this area.
    In accordance with 5 U.S.C. 553(d) of the APA, this action shall 
become effective immediately upon publication. The immediate effective 
date for this action is authorized under 5 U.S.C. 553(d)(1).
    Section 553(d)(1) of the APA provides that final rules shall not 
become effective until 30 days after publication in the Federal 
Register ``except . . . a substantive rule which grants or recognizes 
an exemption or relieves a restriction.'' The purpose of this provision 
is to ``give affected parties a reasonable time to adjust their 
behavior before the final rule takes effect.'' Omnipoint Corp. v. Fed. 
Commc'n Comm'n, 78 F.3d 620, 630 (D.C. Cir. 1996); see also United 
States v. Gavrilovic, 551 F.2d 1099, 1104 (8th Cir. 1977) (quoting 
legislative history). However, when the agency grants or recognizes an 
exemption or relieves a restriction, affected parties do not need a 
reasonable time to adjust because the effect is not adverse. The EPA 
has determined that this rule relieves a restriction because this rule 
relieves sources in the area of Nonattainment NSR permitting 
requirements; instead, upon the effective date of this action, sources 
will be subject to less restrictive Prevention of Significant 
Deterioration permitting requirements. For this reason, the EPA finds 
that under 5 U.S.C. 553(d)(1) it is appropriate for this action to 
become effective on the date of publication of this action.

IV. Incorporation by Reference

    In this rule, the EPA is finalizing regulatory text that includes 
incorporation by reference. In accordance with requirements of 1 CFR 
51.5, the EPA is finalizing the incorporation by reference of the 
Ohio's DFFOs issued to Globe described in section I of this preamble 
and set forth in the amendments to 40 CFR part 52 below. The EPA has 
made, and will continue to make, these documents generally available 
through <a href="https://www.regulations.gov">https://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). Therefore, 
these materials have been approved by the EPA for inclusion in the SIP, 
have been incorporated by reference 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 incorporated by reference in the next update to the SIP 
compilation.\4\
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    \4\ 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 these reasons, 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.);
    <bullet> Does not contain any unfunded mandate or significantly or 
uniquely affect small governments, as described

[[Page 16561]]

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, 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 June 1, 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 CAA section 307(b)(2).42 U.S.C. 
7607(b)(2).

List of Subjects

40 CFR Part 52

    Environmental protection, Air pollution control, Incorporation by 
reference, Intergovernmental relations, Reporting and recordkeeping 
requirements, Sulfur oxides.

40 CFR Part 81

    Environmental protection, Air pollution control, National parks, 
Wilderness areas.

    Dated: March 26, 2026.
Cheryl Newton,
Acting Regional Administrator, Region 5.

    For the reasons stated in the preamble, title 40 CFR parts 52 and 
81 are amended 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.


0
2. Amend Sec.  52.1870 by:
0
a. In the table in paragraph (d) revising the entry for ``Globe 
Metallurgical, Inc.''.
0
b. In the table in paragraph (e) under ``Summary of Criteria Pollutant 
Maintenance Plan'' adding an entry for ``SO<INF>2</INF> (2010)'' before 
the entry for ``CO (1979)''.
    The revision and addition read as follows:


Sec.  52.1870   Identification of plan.

* * * * *
    (d) * * *

                                  EPA-Approved Ohio Source-Specific Provisions
----------------------------------------------------------------------------------------------------------------
                                                             Ohio effective
          Name of source                      No.                 date        EPA approval date      Comments
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
Globe Metallurgical Inc..........  DFFOs...................       3/26/2025  4/2/2026, 91 FR
                                                                              [INSERT FEDERAL
                                                                              REGISTER PAGE
                                                                              WHERE THE DOCUMENT
                                                                              BEGINS].
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------

    (e) * * *

                         EPA-Approved Ohio Nonregulatory and Quasi-Regulatory Provisions
----------------------------------------------------------------------------------------------------------------
                                   Applicable
           Title              geographical or non-     State date            EPA approval            Comments
                                 attainment area
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------
                                 Summary of Criteria Pollutant Maintenance Plan
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
SO2 (2010).................  Muskingum River.......       3/31/2025  4/2/2026, 91 FR [INSERT
                                                                      FEDERAL REGISTER PAGE
                                                                      WHERE THE DOCUMENT BEGINS].
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------


[[Page 16562]]

* * * * *

PART 81--DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES

0
3. The authority citation for part 81 continues to read as follows:

    Authority:  42 U.S.C. 7401 et seq.


0
4. In Sec.  81.336 amend the table entitled ``Ohio-2010 Sulfur Dioxide 
NAAQS [Primary]'' by revising the entry for ``Muskingum River, OH'' to 
read as follows:


Sec.  81.336   Ohio.

* * * * *

                     Ohio--2010 Sulfur Dioxide NAAQS
                                [Primary]
------------------------------------------------------------------------
                                               Designation
      Designated area \1\       ----------------------------------------
                                    Date \2\               Type
------------------------------------------------------------------------
 
                              * * * * * * *
Muskingum River, OH............        4/2/2026  Attainment.
    Morgan County (part).......
        Center Township........
    Washington County (part)...
        Waterford Township.....
 
                              * * * * * * *
------------------------------------------------------------------------
\1\ Includes any Indian country in each county or area, unless otherwise
  specified. EPA is not determining the boundaries of any area of Indian
  country in this table, including any area of Indian country located in
  the larger designation area. The inclusion of any Indian country in
  the designation area is not a determination that the state has
  regulatory authority under the Clean Air Act for such Indian country.
\2\ This date is April 9, 2018, unless otherwise noted.

* * * * *
[FR Doc. 2026-06397 Filed 4-1-26; 8:45 am]
BILLING CODE 6560-50-P


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