[Federal Register Volume 84, Number 100 (Thursday, May 23, 2019)]
[Proposed Rules]
[Pages 23750-23753]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-10723]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R04-OAR-2018-0257; FRL-9993-98-Region 4]


Air Plan Approval; North Carolina: PSD Requirements for GHGs

AGENCY: Environmental Protection Agency.

ACTION: Proposed rule.

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SUMMARY: The Environmental Protection Agency (EPA) is proposing to 
approve State Implementation Plan (SIP) revisions dated July 30, 2012, 
and January 12, 2018, submitted by the State of North Carolina through 
the North Carolina Department of Environmental Quality (NCDEQ). These 
SIP revisions are related to the State's Prevention of Significant 
Deterioration (PSD) permitting program requirements for greenhouse 
gases (GHGs). This action is being proposed pursuant to the Clean Air 
Act (CAA or Act).

DATES: Comments must be received on or before June 24, 2019.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R04-
OAR-2018-0257 at http://www.regulations.gov. Follow the online 
instructions for submitting comments. Once submitted, comments cannot 
be edited or removed from Regulations.gov. 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. 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 http://www2.epa.gov/dockets/commenting-epa-dockets.

FOR FURTHER INFORMATION CONTACT: Andres Febres, Air Regulatory 
Management Section, Air Planning and Implementation Branch, Air and 
Radiation Division, U.S. Environmental Protection Agency, Region 4, 61 
Forsyth Street SW, Atlanta, Georgia 30303-8960. Mr. Febres can be 
reached by telephone at (404) 562-8966 or via electronic mail at 
[email protected].

SUPPLEMENTARY INFORMATION: 

I. What action is the agency taking?

    EPA received two SIP revisions from NCDEQ, dated July 30, 2012, and 
January 12, 2018, that include changes to North Carolina's SIP-approved 
air quality rule at 15 North Carolina Administrative Code (NCAC) 02D 
.0544--Prevention of Significant Deterioration Requirements for 
Greenhouse Gases.1 2 3 The 2012 and 2018 revisions include 
several administrative and typographical changes to the rule, as well 
as a modification to the date associated with the incorporation by 
reference (IBR) of 40 CFR 51.166 that was initially meant to capture 
EPA's final action entitled ``Deferral for CO2 Emissions 
From Bioenergy and Other Biogenic Sources Under the Prevention of 
Significant Deterioration (PSD) and Title V Programs'' (hereinafter 
referred to as the ``Biomass Deferral Rule'' and discussed in Section 
II.B, below). In a March 4, 2019, letter, North Carolina asked EPA to 
approve changes to the IBR-related paragraph in Section 0544, including 
the date modification, but to exclude the adoption of the Biomass 
Deferral Rule from the IBR.\4\
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    \1\ EPA notes that the agency received the SIP revisions on 
August 3, 2012, and February 2, 2018, respectively.
    \2\ In the table of North Carolina regulations approved into the 
SIP at 40 CFR 52.1770(c), 15A NCAC 02D is referred to as 
``Subchapter 2D Air Pollution Control Requirements.''
    \3\ The PSD permitting program is established in part C of title 
I of the CAA and applies in areas that meet the National Ambient Air 
Quality Standards (NAAQS)--``attainment areas''--as well as areas 
where there is insufficient information to determine if the area 
meets the NAAQS--``unclassifiable areas.'' EPA's regulations 
governing PSD implementation are located at 40 CFR 51.166 and 52.21.
    \4\ The March 4, 2019, supplemental letter is located in the 
docket for this proposed rulemaking.
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    The 2018 submittal also seeks to remove the PSD requirements for 
major stationary sources based solely on their GHG emissions; add a new 
paragraph--paragraph (d)--regarding the global warming potential for 
GHGs; and re-letter several paragraphs in the rule due to the addition 
of the new paragraph (e.g., changing paragraph (d) in the SIP-approved 
rule to paragraph (e)).\5\ The revisions removing PSD requirements 
based solely on GHG emissions are in response to court decisions 
invalidating and vacating the Federal regulations that applied PSD 
permitting requirements to major sources based solely on their GHG 
emissions.\6\ More

[[Page 23751]]

detail on the court decisions is included in Section II, below.
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    \5\ In North Carolina's January 12, 2018, SIP revision cover 
letter, the State also mentions changes to rule 15 NCAC 02D Section 
.0502--Applicability, which relates to title V permitting 
requirements for GHGs. This rule is mentioned because it was 
approved, together with Section .0544, by the North Carolina Rules 
Review Commission, but the redline strikeout changes were not 
include as part of the January12, 2018 SIP package. Additionally, 
North Carolina explains in its letter that they do not wish for EPA 
to review these changes because they are not part of the SIP but 
rather part of the State's title V operating permit program.
    \6\ See Utility Air Regulatory Group (UARG) v. EPA, 134 S. Ct. 
2427 (2014); Coalition for Responsible Regulation, Inc. v. EPA, 606 
Fed. Appx. 6, 7 (D.C. Cir. 2015).
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    EPA is proposing to approve the July 30, 2012, and January 12, 
2018, SIP revisions as supplemented by the State's March 4, 2019, 
letter.\7\ EPA's analysis of North Carolina's submittal and the 
reasoning for proposing approval is included in Section III, below.
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    \7\ Pursuant to the State's March 4, 2019, letter, EPA's 
proposed approval of the IBR date does not include the Biomass 
Deferral Rule. As discussed in Section III, below, EPA's proposed 
approval is also based on the State's interpretation of Section 
.0544(b)(1) included in a December 7, 2018, letter from NCDEQ.
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II. Background

A. GHG Tailoring Rule

    On January 2, 2011, GHG emissions were, for the first time, covered 
by the PSD and title V operating permit programs.\8\ To establish a 
process for phasing in the permitting requirements for stationary 
sources of GHGs under the CAA's PSD and title V programs, on June 3, 
2010, EPA published a final rule entitled ``Prevention of Significant 
Deterioration and Title V Greenhouse Gas Tailoring Rule'' (hereinafter 
referred to as the ``GHG Tailoring Rule''). See 75 FR 31514. In Step 1 
of the GHG Tailoring Rule, which began on January 2, 2011, EPA limited 
application of PSD and title V requirements to sources and 
modifications of GHG emissions, but only if they were subject to PSD or 
title V ``anyway'' due to their emissions of pollutants other than 
GHGs. These sources and modifications covered under Step 1 are commonly 
referred to as ``anyway sources'' and ``anyway modifications,'' 
respectively.
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    \8\ See 75 FR 17004 (April 2, 2010).
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    In Step 2 of the GHG Tailoring Rule, which applied as of July 1, 
2011, the PSD and title V permitting requirements extended beyond the 
sources and modifications covered under Step 1 to apply to sources that 
were classified as major sources based solely on their GHG emissions or 
potential to emit GHGs. Step 2 also applied PSD permitting requirements 
to modifications of otherwise major sources that would increase only 
GHG emissions above the level in the Federal PSD regulations. EPA 
generally described the sources and modifications covered by PSD under 
Step 2 of the Tailoring Rule as ``Step 2 sources and modifications'' or 
``GHG-only sources and modifications.''
    Subsequently, EPA published Step 3 of the GHG Tailoring Rule on 
July 12, 2012. See 77 FR 41051. In this rule, EPA decided against 
further phase-in of the PSD and title V requirements for sources 
emitting lower levels of GHG emissions. Thus, the thresholds for 
determining PSD and title V applicability based on emissions of GHGs 
remained the same as established in Steps 1 and 2 of the Tailoring 
Rule.
    On June 23, 2014, the U.S. Supreme Court addressed the application 
of stationary source permitting requirements to GHG emissions in 
Utility Air Regulatory Group (UARG) v. EPA, 134 S. Ct. 2427 (2014). The 
Supreme Court upheld EPA's regulation of GHG Step 1--or ``anyway'' 
sources--but held that EPA may not treat GHGs as air pollutants for the 
purpose of determining whether a source is a major source (or is 
undergoing a major modification) and thus require the source to obtain 
a PSD or title V permit. Therefore, the Court invalidated the PSD and 
title V permitting requirements for GHG Step 2 sources and 
modifications.
    In accordance with the Supreme Court's decision, on April 10, 2015, 
the United States Court of Appeals for the District of Columbia Circuit 
(D.C. Circuit) issued an Amended Judgment vacating the regulations that 
implemented Step 2 of the GHG Tailoring Rule, but not the regulations 
that implement Step 1 of the GHG Tailoring Rule. See Coalition for 
Responsible Regulation, Inc. v. EPA, 606 Fed. Appx. 6, 7 (D.C. Cir. 
2015). The Amended Judgment specifically vacated the EPA regulations 
under review (including 40 CFR 51.166(b)(48)(v) and 40 CFR 
52.21(b)(49)(v)) ``to the extent they require a stationary source to 
obtain a PSD permit if greenhouse gases are the only pollutant (i) that 
the source emits or has the potential to emit above the applicable 
major source thresholds, or (ii) for which there is a significant 
emissions increase from a modification.'' Id. at 7-8.
    EPA promulgated a good cause final rule on August 19, 2015, 
entitled ``Prevention of Significant Deterioration and Title V 
Permitting for Greenhouse Gases: Removal of Certain Vacated Elements.'' 
See 80 FR 50199 (August 19, 2015) (hereinafter referred to as the 
``Good Cause GHG Rule''). The rule removed from the Federal regulations 
the portions of the PSD permitting provisions for Step 2 sources that 
were vacated by the D.C. Circuit (i.e., 40 CFR 51.166(b)(48)(v) and 
52.21(b)(49)(v)). EPA therefore no longer has the authority to conduct 
PSD permitting for Step 2 sources, nor can the Agency approve 
provisions submitted by a state for inclusion in its SIP providing this 
authority. On October 3, 2016, EPA proposed to revise provisions in the 
PSD permitting regulations applicable to GHGs to address the GHG 
applicability threshold for PSD in order to fully conform with UARG and 
the Amended Judgment, but those revisions have not been finalized. See 
81 FR 68110.

B. Biomass Deferral Rule

    On July 20, 2011, EPA finalized the Biomass Deferral Rule, which 
deferred for a period of three years, the application of PSD and Title 
V permitting requirements to carbon dioxide (CO2) emissions 
from bioenergy and other biogenic stationary sources (also known as 
biogenic CO2 emissions). See 76 FR 43490. During this three-
year period, stationary sources that combust biomass and constructed or 
modified a facility would have avoided the application of PSD to 
biogenic CO2 emissions resulting from construction or 
modification. The deferral applied only to biogenic CO2 
emissions and did not affect other GHGs emitted from the combustion of 
biomass fuel and decomposition of biogenic material or non-GHG 
pollutants. Additionally, the deferral only applied to biogenic 
CO2 emissions in the PSD and Title V programs; it did not 
apply to any other EPA programs, such as the GHG Reporting Program.\9\
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    \9\ See https://www.epa.gov/ghgreporting for information on the 
GHG Reporting Program.
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    On July 12, 2013, the D.C. Circuit vacated the Biomass Deferral 
Rule, but on November 14, 2013, issued an order delaying the vacatur of 
the Biomass Deferral Rule until the United States Supreme Court made a 
final decision in the UARG case related to the GHG Tailoring Rule. See 
Center for Biological Diversity v. EPA, 722 F.3d 401. After a final 
decision was made by the Supreme Court on June 23, 2014, in UARG, EPA 
did not take formal action to remove the Biomass Deferral Rule from the 
CFR. Although the language of the Biomass Deferral Rule remains in 
place at 40 CFR 51.166(b)(48)(ii)(a), 52.21(b)(49)(ii)(a), 70.2(2), and 
71.2(2), the deferral is no longer operative.

III. Analysis of State's Submittal

    The proposed changes to the SIP-approved version of 15 NCAC 02D 
.0544 in the July 30, 2012, SIP revision include administrative edits 
to the rule and an update to the IBR date for 40 CFR 51.166 at Section 
.0544(n) (subsequently re-lettered to paragraph (o) in the January 12, 
2018, SIP revision). The administrative changes include the correction 
of acronyms for New Source Review (NSR) found under paragraphs (a) and 
(b) of the rule, as well as the clarification of a reference to the 
``owner or operator'' of a facility made in the last subparagraph of 
paragraph (m) (subsequently re-lettered

[[Page 23752]]

to paragraph (n) in the January 12, 2018, SIP revision).
    The change to the IBR date included in the July 30, 2012, SIP 
revision seeks to revise the date from August 2, 2010, to July 20, 
2011. The State originally included this change to capture the 
promulgation of the Biomass Deferral Rule. However, because the Biomass 
Deferral Rule was subsequently vacated but no formal action was taken 
to remove the language from the Federal PSD regulations after the UARG 
decision, North Carolina decided to withdraw the change to the IBR date 
paragraph from the July 30, 2012, SIP revision through a letter dated 
January 16, 2015.10 11
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    \10\ The January 16, 2015 letter is located in the docket for 
this proposed rulemaking.
    \11\ In a notice of proposed rulemaking (NPRM) published on 
April 19, 2013, EPA proposed to approve the IBR-related changes to 
Section .0544 in North Carolina's July 30, 2012, SIP revision to 
capture the Biomass Deferral Rule. EPA never took final action to 
approve those changes because of the July 12, 2013 vacatur of the 
Rule. Today's proposal supersedes the April 19, 2013, NPRM.
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    In its January 12, 2018, SIP revision, as supplemented by its March 
4, 2019, letter, North Carolina seeks to make additional changes to 
Section .0544. Specifically, North Carolina seeks to: (1) Modify the 
language of .0544(a) in order to capture the effects of the UARG 
decision on PSD and title V permitting requirements for GHG-only, or 
Step 2, sources; (2) add a new paragraph to Section .0544--paragraph 
(d)--to automatically incorporate any changes to the Federal GHG global 
warming potentials; (3) re-letter certain paragraphs in Section .0544 
due to the addition of paragraph (d); (4) make administrative edits to 
the section; and (5) modify the IBR paragraph to, among other things, 
change the IBR date of 40 CFR 51.166 to July 20, 2011. As discussed 
above, North Carolina's March 4, 2019, letter asks EPA to approve 
changes to the IBR-related paragraph in Section 0544, including the 
date modification, but to exclude the Biomass Deferral Rule from the 
IBR.
    As previously mentioned, the UARG decision invalidated and vacated 
the PSD and title V permitting requirements for GHG-only, or Step 2, 
sources and modifications. North Carolina had previously adopted the 
GHG Tailoring Rule through the August 2, 2010, IBR date of 40 CFR 
51.166 found in the current SIP-approved version of Section .0544(n). 
North Carolina's January 12, 2018, SIP revision seeks to add language 
to Section .0544 to capture the effects of the UARG decision. 
Specifically, North Carolina proposes to add the following language to 
paragraph (a) of Section .0544--``A major stationary source or major 
modification shall not be required to obtain a prevention of 
significant deterioration (PSD) permit on the sole basis of its 
greenhouse gases emissions.'' Given the UARG decision and the fact that 
the State is still being as stringent as the current Federal PSD 
requirements for GHGs, EPA is proposing to approve these changes.
    Additionally, in the January 12, 2018, SIP revision, North Carolina 
adds paragraph (d) to Section .0544 in order to automatically 
incorporate any changes to the Federal GHG global warming potentials 
into the definition of ``subject to regulation'' incorporated by 
reference from 40 CFR 51.166(b)(48) that may occur after the IBR date. 
In order to determine if a source is subject to regulation for GHGs, a 
source's total GHG emissions are calculated using the global warming 
potentials published in Table A-1 of Subpart A of 40 CFR part 98.\12\ 
North Carolina's revision ensures that any future changes EPA makes to 
Table A-1 are concurrently incorporated into the State's SIP-approved 
PSD program for greenhouse gases without the need for further SIP 
revisions. For this reason, EPA is proposing to incorporate paragraph 
(d) into the SIP. Furthermore, due to the addition of paragraph (d), 
the State seeks to re-letter the remaining paragraphs in the rule 
(e.g., changing paragraph (e) in the SIP-approved rule to paragraph 
(f)). EPA is proposing to approve this organizational change.
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    \12\ GHGs, as defined in the definition of ``subject to 
regulation'' at 40 CFR 51.166(b)(48), is the aggregate of six 
different gases: Carbon dioxide, nitrous oxide, methane, 
hydrofluorocarbons, perfluorocarbons, and sulfur hexafluoride. To 
calculate the total GHG emissions for a source: (1) The mass amount 
of emissions, in tons per year (tpy), of each individual GHG is 
multiplied by its global warming potential found in Table A-1 of 
Subpart A of 40 CFR 98, and (2) the resulting values for each 
individual GHG are added. This results in the total GHG emissions 
for the source expressed in tpy of CO2 equivalent (tpy 
CO2e).
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    Originally, the January 12, 2018, SIP revision also sought to re-
letter the IBR paragraph at Section .0544(n) to paragraph (o) and 
revise the IBR date of 40 CFR 51.166 from August 2, 2010, to July 20, 
2011, without exception. Because North Carolina had previously asked 
EPA not to approve the updates to the IBR paragraph submitted in the 
July 30, 2012, SIP revision, EPA requested clarification from the State 
on whether they want EPA to incorporate the changes to the IBR-related 
paragraph into the SIP. Subsequently, on December 7, 2018, North 
Carolina submitted a letter to EPA stating that it was not requesting 
that EPA approve paragraph (o) into the SIP because the Biomass 
Deferral Rule had expired and EPA had not taken action to remove the 
rule language from 40 CFR 51.166.
    However, due to the re-lettering, approving the revisions to 
Section .0544 into the SIP without paragraph (o) could cause confusion 
for the general public and would create an inconsistency between the 
SIP-approved version and the state version of the rule. Therefore, 
North Carolina submitted the March 4, 2019, letter asking EPA to 
approve all changes to Section .0544 from its July 30, 2012, and 
January 12, 2018, SIP revisions, including the adoption of paragraph 
(o) with the IBR date update, but to exclude the adoption of the 
Biomass Deferral Rule language from the July 20, 2011, IBR of 40 CFR 
51.166. Therefore, EPA is proposing to incorporate paragraph (o) into 
the SIP with this exclusion.\13\
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    \13\ If EPA takes final action to approve the July 30, 2012, and 
the January 12, 2018, SIP revisions, it will place a note in the 
entry for Section .0544 in the table of North Carolina SIP-approved 
rules, at 40 CFR 52.1770(c), explaining that the Biomass Deferral 
Rule is excluded from the July 20, 2011 IBR of 40 CFR 51.166.
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    Finally, the January 12, 2018 SIP revision also seeks to remove the 
term ``immediately'' from the following subparagraph (Section 
.0544(b)(1)) in the definition of ``baseline actual emissions'':

    For an existing emissions unit, baseline actual emissions means 
the average rate, in tons per year, at which the emissions unit 
actually emitted the pollutant during any consecutive 24-month 
period selected by the owner or operator within the 5-year period 
immediately preceding the date that a complete permit application is 
received by the Division for a permit required under this Rule. The 
Director shall allow a different time period, not to exceed 10 years 
immediately preceding the date that a complete permit application is 
received by the Division, if the owner or operator demonstrates that 
it is more representative of normal source operation. . . .

    In the December 7, 2018, supplemental letter, the State explained 
that the term was eliminated as the result of a technical correction 
from the North Carolina Rules Review Commission to remove extraneous 
text throughout North Carolina's rules. North Carolina also stated that 
it intends to enforce subparagraph (b)(1) as if the term 
``immediately'' were present in the rule. EPA's proposed action to 
incorporate the change is based on the State's interpretation of this 
subparagraph as explained in its December 7, 2018 letter.
    All other changes to Section .0544 consist of administrative and 
typographical corrections that have no effect on how the PSD provisions 
for

[[Page 23753]]

GHG would operate in the State. For all of the reasons discussed above, 
EPA proposes to incorporate the changes to Section .0544 into the North 
Carolina SIP from the July 30, 2012 and January 12, 2018, SIP revisions 
but exclude the Biomass Deferral Rule language from the IBR of 40 CFR 
51.166.

IV. Incorporation by Reference

    In this document, 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, EPA is proposing to incorporate by 
reference, under Subchapter 2D, Air Pollution Control Requirements of 
the North Carolina SIP, Section .0544--``Prevention of Significant 
Deterioration Requirements for Greenhouse Gases,'' state-effective 
September 1, 2015.\14\ EPA has made, and will continue to make, these 
materials generally available through www.regulations.gov and at the 
EPA Region 4 office (please contact the person identified in the FOR 
FURTHER INFORMATION CONTACT section of this preamble for more 
information).
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    \14\ As discussed above, EPA is proposing to exclude the Biomass 
Deferral Rule from the July 20, 2011 IBR of 40 CFR 51.166, found in 
Section .0544(o).
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V. Proposed Action

    EPA is proposing to approve North Carolina's July 30, 2012, and 
January 12, 2018, SIP revisions that revise the PSD requirements for 
GHGs under 15 NCAC 02D .0544--Prevention of Significant Deterioration 
Requirements for Greenhouse Gases as described above. Specifically, EPA 
is proposing to approve language under paragraph (a) that will prevent 
the regulation of GHG-only, or Step 2 sources; the adoption of new 
paragraph (d), regarding the definition of global warming potential for 
GHGs, and the re-lettering of Section .0544 following the new paragraph 
(d); the deletion of the term ``immediately'' from paragraph (b)(1); 
the adoption of paragraph (o), excluding incorporation of the Biomass 
Deferral Rule into the July 20, 2011 IBR of 40 CFR 51.166; and adoption 
of various administrative edits such as the addition of acronyms and 
typographical corrections throughout the rule. EPA believes that these 
changes are consistent with the requirements of the CAA.

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 Act and applicable 
Federal regulations. See 42 U.S.C. 7410(k); 40 CFR 52.02(a). Thus, in 
reviewing SIP submissions, EPA's role is to approve state choices, 
provided that they meet the criteria of the CAA. This proposed action 
merely proposes to approve state law as meeting Federal requirements 
and does not impose additional requirements beyond those imposed by 
state law. For that reason, this proposed action:
     Is not a significant regulatory action subject to review 
by the Office of Management and Budget under Executive Orders 12866 (58 
FR 51735, October 4, 1993) and 13563 (76 FR 3821, January 21, 2011);
     Is not an Executive Order 13771 (82 FR 9339, February 2, 
2017) regulatory action because SIP approvals are exempted 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 an economically significant regulatory action based 
on health or safety risks subject to Executive Order 13045 (62 FR 
19885, April 23, 1997);
     Is not a significant regulatory action subject to 
Executive Order 13211 (66 FR 28355, May 22, 2001);
     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; and
     Does not provide EPA with the discretionary authority to 
address, as appropriate, disproportionate human health or environmental 
effects, using practicable and legally permissible methods, under 
Executive Order 12898 (59 FR 7629, February 16, 1994).
    The SIP is not approved to apply on any Indian reservation land or 
in any other area where 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 as specified by Executive Order 13175 (65 
FR 67249, November 9, 2000), nor will it impose substantial direct 
costs on tribal governments or preempt tribal law.

List of Subjects in 40 CFR Part 52

    Environmental protection, Air pollution control, Carbon monoxide, 
Incorporation by reference, Lead, Nitrogen dioxide, Ozone, Particulate 
matter, Reporting and recordkeeping requirements, Sulfur oxides, 
Volatile organic compounds.

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

    Dated: May 10, 2019.
Mary S. Walker,
Acting Regional Administrator, Region 4.
[FR Doc. 2019-10723 Filed 5-22-19; 8:45 am]
 BILLING CODE 6560-50-P