Document ID: EPA-R05-OAR-2011-0698-0009
Agency: epa
Document Type: Proposed Rule
Title: Supplemental Proposal for the Clark and Floyd Counties Indiana (Louisville) 1997 PM2.5 Annual Standard Redesignation
Posted Date: 2016-06-23T04:00Z

[Federal Register Volume 81, Number 121 (Thursday, June 23, 2016)]
[Proposed Rules]
[Pages 40834-40838]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2016-14806]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 52 and 81

[EPA-R05-OAR-2011-0698; FRL-9948-00-Region 5]

Approval and Promulgation of Air Quality Implementation Plans; 
Indiana; Redesignation of the Indiana Portion of the Louisville Area to 
Attainment of the 1997 Annual Standard for Fine Particulate Matter

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule; supplemental.

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SUMMARY: The Environmental Protection Agency (EPA) is issuing a 
supplement to its July 11, 2013, proposed approval of Indiana's request 
to redesignate the Indiana portion of the Louisville, Indiana-Kentucky, 
area to attainment for the 1997 annual national ambient air quality 
standard (NAAQS or standard) for fine particulate matter 
(PM2.5). After EPA's proposed redesignation in 2013, an 
audit of the Kentucky monitoring program identified problems which 
invalidated monitoring data for 2012 and the beginning of 2013. Because 
of this invalid data, the area could not meet the requirement that the 
entire area must demonstrate attainment of the standard using the most 
current three years of data. This supplemental proposal provides new 
quality-assured, quality-controlled data for the most recent three 
years of data showing that the entire area attains the 1997 
PM2.5 standard. In the supplemental proposal EPA is 
proposing that the entire Louisville area is attaining the 1997 
PM2.5 NAAQS based on the most recent three years of data. 
EPA also discusses the maintenance plan out-year emission projections, 
and the Cross-State Air Pollution Rule (CSAPR) remanded budgets impact 
on the Louisville area--because the status of these issues has changed 
from the initial proposal to now. EPA is seeking comment only on the 
issues raised in this supplemental proposal, and is not re-opening for 
comment other issues raised in the July 11, 2013, proposed approval.

DATES: Comments must be received on or before July 25, 2016.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-R05-
OAR-2011-0698 at http://www.regulations.gov or via email to 
blakley.pamela@epa.gov. For comments submitted at Regulations.gov, 
follow the online instructions for submitting comments. Once submitted, 
comments cannot be edited or removed from Regulations.gov. For either 
manner of submission, 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, please contact the person 
identified in the FOR FURTHER INFORMATION CONTACT section. For 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: Carolyn Persoon, Environmental 
Engineer, Control Strategies Section, Air Programs Branch (AR-18J), 
Environmental Protection Agency, Region 5, 77 West Jackson Boulevard, 
Chicago, Illinois 60604, (312) 353-8290, persoon.carolyn@epa.gov.

SUPPLEMENTARY INFORMATION: Throughout this document whenever ``we,'' 
``us,'' or ``our'' is used, we mean EPA. This SUPPLEMENTARY INFORMATION 
section is arranged as follows:

I. What is the background for the supplemental proposal?
II. On what specific issues is EPA taking comment?
    A. Louisville Area Design Values for 2013-2015; Entire Area 
Monitoring Attainment
    B. Demonstration of Maintenance
    C. CAIR and CSAPR
III. Summary of Proposed Actions
IV. Statutory and Executive Order Reviews

I. What is the background for the supplemental proposal?

    On June 16, 2011, the Indiana Department of Environmental 
Management (IDEM) submitted a request for EPA to approve the 
redesignation of the Indiana portion of the Louisville (KY-IN) (Madison 
Township, Indiana, Jefferson County, Kentucky and Clark and Floyd 
Counties, Indiana) nonattainment area to attainment of the 1997 
PM2.5 annual standard. Indiana's June 16, 2011, 
redesignation submittal contained complete, quality-assured and 
certified air monitoring data for the years 2008-2010.
    On July 11, 2013, EPA proposed to determine that the Indiana 
portion of the Louisville area had met the requirements for 
redesignation under section 107(d)(3)(E) of the Clean Air Act (CAA) (78 
FR 41735). This proposal was based upon our review of ambient air 
monitoring data from 2009-2011, and preliminary data from 2012. It 
contained several related actions.
    First, EPA proposed to approve the request from IDEM to change the 
legal designation of the Indiana portion of the Louisville area from 
nonattainment to attainment for the 1997 annual PM2.5 NAAQS. 
EPA also proposed to approve Indiana's PM2.5 maintenance 
plan for the Indiana portion of the Louisville area as a revision to 
the Indiana state implementation plan (SIP) because the plan met the 
requirements of section 175A of the CAA. In addition, EPA proposed to 
approve emissions inventories for primary PM2.5, and all its 
precursors as satisfying the requirement in section 172(c)(3) of the 
CAA for a comprehensive, current emission inventory. Finally, EPA 
proposed a

[[Page 40835]]

motor vehicle emissions budget for the Indiana portion of the 
Louisville area. EPA did not receive adverse comments on the proposed 
rulemaking.
    In August 2013, EPA issued results of a technical systems audit on 
the PM2.5 laboratory in Kentucky, which invalidated the 
Jefferson County monitoring data for all of 2012, and a small portion 
of the monitoring data from 2013 (a portion of the first quarter). See 
the docket for the technical systems audit information. Since the area 
could no longer demonstrate attainment of the standard for the entire 
area, EPA did not finalize its proposal. Kentucky began collecting 
valid data in early 2013 (the end of the first quarter) after the 
monitoring audit issues had been addressed, resulting in a valid design 
value for the area using 2013-2015 data. Both Indiana and Kentucky 
certified valid data for 2015 in the beginning of 2016. EPA has 
approved the use of this quality-assured, quality-controlled certified 
complete data for use in regulatory actions.
    Today, EPA is publishing a supplement to its July 11, 2013, 
proposed rulemaking. The supplement is based on valid design values for 
the 2013-2015 period, demonstrating attainment of the standard for the 
entire Louisville area using the most recent three years of data. 
Preliminary data for 2016 shows that the entire Louisville area 
continues to attain the standard. This proposal also discusses the 
maintenance plan emission projections of 2025 and the impact of the 
budgets remanded under CSAPR on the Louisville area because the status 
of these issues has changed from the initial proposal.

II. On what specific issues is EPA taking comments?

    In this portion of EPA's supplemental proposal, EPA is soliciting 
comment on the limited issue of the 2013-2015 design values 
demonstrating attainment of the standard for the entire Louisville 
area, the maintenance plan emission projections for 2025, and the 
impact on the Louisville area of the 2015 D.C. Circuit decision 
remanding certain CSAPR budgets.

A. Louisville Area Design Values for 2013-2015; Entire Area Monitoring 
Attainment

    EPA is proposing to determine that the Louisville area is attaining 
the 1997 annual PM2.5 NAAQS based upon the most recent three 
years of complete, certified and quality-assured data. Under EPA's 
regulations at 40 CFR 50.7, the annual primary and secondary 
PM2.5 standards are met when the annual arithmetic mean 
concentration, as determined in accordance with 40 CFR part 50, 
appendix N, is less than or equal to 15.0 micrograms per cubic 
meter([micro]g/m\3\)at all monitoring sites in the area. Data are 
considered to be sufficient for comparison to the NAAQS if three 
consecutive complete years of data exist. A complete year of air 
quality data is comprised of four calendar quarters, with each quarter 
containing data from at least 75% capture of the scheduled sampling 
days. In this case, the 2009-2011 values were calculated prior to the 
audit invalidating data collected in the Kentucky portion of Louisville 
for 2012 and beginning of 2013 (portion of the first quarter). The 
2013-2015 values are based on quality-assured, quality-controlled, 
certified complete data, and only included valid data collected after 
the audit issues were corrected. Preliminary data for 2016 shows the 
area continues to attain the standard. The Louisville design value for 
the most current three years of data is 11.7 [mu]g/m\3\.

Table 1--The 1997 Annual PM2.5 Design Values for the Louisville Monitor With Complete Data for the 2009-2011,\1\
                                   and 2013-2015 Design Value in [micro]g/m\3\
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                                                                                   Design value    Design value
                             County                                    Site          2009-2011       2013-2015
                                                                                   ([mu]g/m\3\)    ([mu]g/m\3\)
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Clark County, IN................................................       180190006            13.5            11.4
Clark County, IN................................................       180190008            11.4             9.3
Floyd County, IN................................................       180431004            12.3            10.0
Jefferson County, KY............................................       211110043            12.6            11.3
Jefferson County, KY............................................       211110051            12.7            11.7
Jefferson County, KY............................................       211110067            12.1            10.5
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\1\ 2009-2011 design values are the desigh values for the area prior to date issues, and design values for 2013-
  2015 are the most recent three years of monitoring data showing that the area is attaining the standard.

    Data recorded at monitors in 2013, 2014, and 2015 are considered 
valid and were collected after corrective actions resulting from the 
technical systems audit. These are the data on which EPA is basing its 
decision that the Louisville area has attained the 1997 annual 
PM2.5 NAAQS.

B. Demonstration of Maintenance

    Along with the redesignation request, Indiana submitted a revision 
to its PM2.5 SIP to include a maintenance plan for the 
Indiana portion of the Louisville area, as required by section 175A of 
the CAA. Indiana's plan demonstrates maintenance of the 1997 annual 
PM2.5 standard through 2025 by showing that current and 
future emissions of oxides of nitrogen (NOX), directly 
emitted PM2.5, and sulfur dioxide (SO2) in the 
area remain at or below attainment year emission levels. Section 175A 
requires a state seeking redesignation to attainment to submit a SIP 
revision which provides for the maintenance of the NAAQS in the area 
``for at least 10 years after the redesignation.'' See September 4, 
1992, memorandum from John Calcagni, entitled ``Procedures for 
Processing Requests to Redesignate Areas to Attainment,'' p. 9. Where 
the emissions inventory method of showing maintenance is used, its 
purpose is to show that emissions during the maintenance period will 
not increase over the attainment year inventory. Calcagni Memorandum, 
pp. 9-10.
    As discussed in detail in the section below, the state's 
maintenance plan submission expressly documents that the area's 
emissions inventories will remain below the attainment year inventories 
through 2025. In addition, for the reasons set forth below, EPA 
believes that the state's submission, in conjunction with additional 
supporting information, further demonstrates that the area will 
continue to maintain the PM2.5 standard at least through 
2026. Thus, if EPA finalizes its proposed approval of the redesignation 
request and maintenance plan in 2016, it will be based on a showing, in 
accordance with section 175A, that the state's maintenance plan 
provides for

[[Page 40836]]

maintenance for at least ten years after redesignation.
    Indiana's plan demonstrates maintenance of the 1997 annual 
PM2.5 NAAQS through 2025 by showing that current and future 
emissions of NOX, directly emitted PM2.5 and 
SO2 for the area remain at or below attainment year emission 
levels.
    The rate of decline in emissions of PM2.5, 
NOX, and SO2 from the attainment year 2008 
through 2025 (calculated from Table 2) indicates that emissions 
inventory levels not only significantly decline between 2008 and 2025, 
but that the reductions will continue in 2026 and beyond. The average 
annual rate of decline is 4,472 tons per year (tpy) for SO2, 
1,052 tpy of NOX, and 8.73 tpy of direct PM for the Indiana 
portion of the Louisville area, and average annual rate of decline is 
4,436 tpy for SO2, 2,239 tpy of NOX, and 98.1 tpy 
of direct PM for the entire Louisville area. These rates of decline are 
consistent with monitored and projected air quality trends, emissions 
reductions achieved through emissions controls and regulations that 
will remain in place beyond 2026 and through fleet turnover that will 
continue beyond 2026, among other factors. We are proposing to find the 
mobile source contribution to these emissions is expected to remain 
insignificant in 2026 and beyond because of fleet turnover in upcoming 
years that will result in cleaner vehicles and cleaner fuels.
    A maintenance demonstration need not be based on modeling. See Wall 
v. EPA, 265 F.3d 426 (6th Cir. 2001), Sierra Club v. EPA, 375 F. 3d 537 
(7th Cir. 2004). See also 66 FR 53094, 53099-53100 (October 19, 2001), 
68 FR 25413, 25430-25432 (May 12, 2003), 78 FR 53272 (August 29, 2013). 
Indiana uses emissions inventory projections for the years 2015 and 
2025 to demonstrate maintenance for the entire Louisville area. The 
projected emissions were estimated by Indiana, with assistance from the 
Lake Michigan Air Directors Consortium (LADCO) and the Kentucky 
Regional Planning and Development Agency (KIPDA), who used the 
MOVES2010a model for mobile source projections. Projection modeling of 
inventory emissions was done for the 2015 interim year emissions using 
estimates based on the 2008 and 2015 LADCO modeling inventory, using 
LADCO's growth factors, for all sectors. The 2025 maintenance year 
emission estimates were based on emissions estimates from the 2015 
LADCO modeling. Table 2 shows the 2008 attainment base year emission 
estimates and the 2015 and 2025 emission projections for the Louisville 
area, taken from Indiana's June 16, 2011, submission.

  Table 2--Comparison of 2008, 2015 and 2025 NOX, Direct PM2.5 and SO2 Emission Totals (tpy) for the Louisville
                                                      Area
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                                              SO2                        NOX                      PM2.5
----------------------------------------------------------------------------------------------------------------
2008 (baseline)..................  151,503.01...............  97,533.93...............  6,724.02.
2015.............................  76,958.54................  69,936.67...............  5,540.29.
2025.............................  76,082.07................  59,455.17...............  5,055.61.
Change 2008-2025.................  -75,420.94...............  -38,078.76..............  -1,668.41.
                                   50% decrease.............  39% decrease............  25% decrease.
----------------------------------------------------------------------------------------------------------------

    Table 2 shows that, for the period between 2008 and the maintenance 
projection for 2025, the Louisville area will reduce NOX 
emissions by 38,078 tpy; direct PM2.5 emissions by 1,668 
tpy; and SO2 emissions by 75,420 tpy. The 2025 projected 
emissions levels are significantly below attainment year inventory 
levels, and, based on the rate of decline, it is highly improbable that 
any increases in these levels will occur in 2026 and beyond. Thus, the 
emissions inventories set forth in Table 2 show that the area will 
continue to maintain the annual PM2.5 standards during the 
maintenance period and at least through 2026.
    As Table 1 and 2 demonstrate, monitored PM2.5 design 
value concentrations in the Louisville area are well below the NAAQS in 
the years beyond 2008, an attainment year for the area. Further, those 
values are trending downward as time progresses. Based on the future 
projections of emissions in 2025 showing significant emissions 
reductions in direct PM2.5, NOX, and 
SO2, it is very unlikely that monitored PM2.5 
values in 2026 and beyond will show violations of the NAAQS. 
Additionally, the 2013-2015 design value of 11.7 [mu]g/m\3\ provides a 
sufficient margin for the 1997 standard in the unlikely event emissions 
rise slightly in the future.

C. CAIR and CSAPR

    In its redesignation request and maintenance plan, the state 
identified the Clean Air Interstate Rule (CAIR) as a permanent and 
enforceable measure that contributed to attainment in the Louisville 
Area. CAIR created regional cap-and-trade programs to reduce 
SO2 and NOX emissions in 27 eastern states, 
including Indiana, that contributed to downwind nonattainment or 
interfered with maintenance of the 1997 8-hour ozone NAAQS and the 1997 
PM2.5 NAAQS. See 70 FR 25162 (May 12, 2005). Indiana adopted 
CAIR budgets into its SIP on November 1, 2006, with emission reductions 
beginning in 2010 and extending into 2015. By 2007, the beginning of 
the attainment time period identified by Indiana, CAIR had begun 
achieving emission reductions in the state.
    In 2008, the United States Court of Appeals for the District of 
Columbia Circuit (D.C. Circuit) vacated CAIR, North Carolina v. EPA, 
531 F.3d 896 (D.C. Cir. 2008); but ultimately remanded the rule to EPA 
without vacatur to preserve the environmental benefits provided by 
CAIR, North Carolina v. EPA, 550 F.3d 1176, 1178 (D.C. Cir. 2008). On 
August 8, 2011 (76 FR 48208), acting on the D.C. Circuit's remand, EPA 
promulgated CSAPR to replace CAIR and, thus, to address the interstate 
transport of emissions contributing to nonattainment and interfering 
with maintenance of the two air quality standards covered by CAIR as 
well as the 2006 PM2.5 NAAQS. CSAPR requires substantial 
reductions of SO2 and NOX emissions from emission 
generating units (EGUs) in 28 states in the eastern United States. As a 
general matter, because CSAPR is CAIR's replacement, emissions 
reductions associated with CAIR will for most areas be made permanent 
and enforceable through implementation of CSAPR.
    Numerous parties filed petitions for review of CSAPR in the D.C. 
Circuit, and on August 21, 2012, the court issued its ruling, vacating 
and remanding CSAPR to EPA and ordering continued implementation of 
CAIR. EME Homer City Generation, L.P. v. EPA, 696 F.3d 7, 38 (D.C. Cir. 
2012). The D.C. Circuit's vacatur of CSAPR was reversed by the United 
States Supreme Court on April 29, 2014, and the case was remanded to 
the D.C. Circuit to resolve remaining issues in accordance with the 
high court's ruling. EPA v. EME

[[Page 40837]]

Homer City Generation, L.P., 134 S. Ct. 1584 (2014). On remand, the 
D.C. Circuit affirmed CSAPR in most respects, but invalidated without 
vacating some of the CSAPR budgets as to a number of states. EME Homer 
City Generation, L.P. v. EPA, 795 F.3d 118 (D.C. Cir. 2015) (EME Homer 
City II). The Phase 2 annual and ozone season NOX and 
SO2 budgets for Indiana are not affected by the Court's 
decision. The litigation over CSAPR ultimately delayed implementation 
of that rule for three years, from January 1, 2012, when CSAPR's cap-
and-trade programs were originally scheduled to replace the CAIR cap-
and-trade programs, to January 1, 2015. CSAPR's Phase 2 budgets were 
originally promulgated to begin on January 1, 2014, and are now 
scheduled to begin on January 1, 2017. CSAPR will continue to operate 
under the existing emissions budgets until EPA addresses the D.C. 
Circuit's remand. The Court's decision did not affect Indiana's CSAPR 
emissions budgets; therefore, CSAPR ensures that the NOX and 
SO2 emissions reductions associated with CAIR and CSPAR 
throughout Indiana are permanent and enforceable.\1\
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    \1\ 2009-2011 design values are the design values for the area 
prior to data issues, and design values for 2013-2015 are the most 
recent three years of monitoring data showing that the area is 
attaining the standard.
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    In its redesignation request, Indiana noted that a number of states 
contributed to PM2.5 concentrations in the Louisville area 
based on EPA air quality modeling. Additionally, an air quality 
modeling analysis conducted by IDEM demonstrates that the Louisville 
area would be able to attain the PM2.5 standard even in the 
absence of either CAIR or CSAPR. See appendices H and I of Indiana's 
redesignation request found in the docket. This modeling is available 
in the docket for this proposed redesignation action.
    To the extent that Louisville relies on CSAPR for maintenance of 
the standard, EPA has identified the Louisville area as having been 
significantly impacted by pollution transported from other states in 
both CAIR and CSAPR, and these rules greatly reduced the tons of 
SO2 and NOX emissions generated in the states 
upwind of the area. The air quality modeling performed for the CSAPR 
rulemaking identified the following states as having contributed to 
PM2.5 concentrations in the Louisville area: Illinois, 
Indiana, Kentucky, Michigan, Missouri, Ohio, Pennsylvania, Tennessee, 
West Virginia and Wisconsin. See 76 FR 48208(August 8, 2011). Even 
though the first phase of CAIR implementation for SO2 did 
not begin until 2010, many sources began reducing their emissions well 
in advance of the first compliance deadline because of the incentives 
offered by CAIR for early compliance with the rule. The emission 
reductions in the states upwind of the Louisville area achieved by 
CAIR, and made permanent by CSAPR, are unaffected by the D.C. Circuit's 
remand of CSAPR.\2\
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    \2\ The D.C. Circuit in EME Homer City II remanded the 
SO2 trading program budgets for four states, none of 
which were identified as contributing to the Louisville area. 
Moreover, updated air quality modeling performed for the CSAPR 
identified that the Louisville area can attain and maintain the 1997 
PM2.5 NAAQS and no modeled issues for the 2012 NAAQS 76 
FR 48207, 48241 (August 8, 2011) and Page memo, March 17, 2016.
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III. Summary of Proposed Actions

    EPA is issuing a supplement to its action, published July 11, 2013, 
which proposed to redesignate the Indiana portion of the Louisville 
area to attainment for the 1997 annual PM2.5 NAAQS, to 
approve the associated maintenance plan, and to approve the state's 
emission inventory. EPA is concluding that the most current three year 
design values show that the area is attaining the standard and 
preliminary values show the area continues to attain the 1997 annual 
PM2.5 NAAQS. EPA also determined that the projections used 
in the states submittal meet the requirements of the maintenance plan 
out-year emission projections. EPA concluded that the CSAPR remanded 
budgets did not affect the area's ability to attain through permanent 
and enforceable measures and will not affect the area's ability to 
maintain the standard. EPA is seeking comment only on the issues raised 
in this supplemental proposal, and is not re-opening comment on other 
issues addressed in its prior proposal.

IV. Statutory and Executive Order Reviews

    Under the CAA, redesignation of an area to attainment and the 
accompanying approval of a maintenance plan under section 107(d)(3)(E) 
are actions that affect the status of a geographical area and do not 
impose any additional regulatory requirements on sources beyond those 
imposed by state law. A redesignation to attainment does not in and of 
itself create any new requirements, but rather results in the 
applicability of requirements contained in the CAA for areas that have 
been redesignated to attainment. Moreover, 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, EPA's role is to 
approve state choices, provided that they meet the criteria of the CAA. 
Accordingly, these proposed actions do not impose additional 
requirements beyond those imposed by state law and the CAA. For that 
reason, these proposed actions:
     Are not ``significant regulatory actions'' 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);
     Do not impose an information collection burden under the 
provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.);
     Are 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.);
     Do 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);
     Do not have Federalism implications as specified in 
Executive Order 13132 (64 FR 43255, August 10, 1999);
     Are not economically significant regulatory actions based 
on health or safety risks subject to Executive Order 13045 (62 FR 
19885, April 23, 1997);
     Are not significant regulatory actions subject to 
Executive Order 13211 (66 FR 28355, May 22, 2001);
     Are 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
     Do 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).
    In addition, this proposed rule does not have tribal implications 
as specified by Executive Order 13175 (65 FR 67249, November 9, 2000), 
because a determination of attainment is an action that affects the 
status of a geographical area and does not impose any new regulatory 
requirements on tribes, impact any existing sources of air pollution on 
tribal lands, nor impair the maintenance of ozone national ambient air 
quality standards in tribal lands.

List of Subjects

40 CFR Part 52

    Environmental protection, Air pollution control, Incorporation by

[[Page 40838]]

reference, Intergovernmental relations, Particulate matter.

40 CFR Part 81

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

    Dated: June 1, 2016.
Robert A. Kaplan,
Acting Regional Administrator, Region 5.
[FR Doc. 2016-14806 Filed 6-22-16; 8:45 am]
 BILLING CODE 6560-50-P