[Federal Register Volume 76, Number 23 (Thursday, February 3, 2011)]
[Rules and Regulations]
[Pages 6056-6066]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2011-2269]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 81

[EPA-HQ-OAR-2007-0562; EPA-HQ-OAR-2010-0163; FRL-9261-3]
RIN 2060-AQ30


Additional Air Quality Designations for the 2006 24-Hour Fine 
Particle National Ambient Air Quality Standards, 110(k)(6) Correction 
and Technical Correction Related to Prior Designation, and Decisions 
Related to the 1997 Air Quality Designations and Classifications for 
the Annual Fine Particles National Ambient Air Quality Standards

AGENCY: Environmental Protection Agency (EPA).

ACTION: Supplemental amendments; Final rule.

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SUMMARY: On November 13, 2009, EPA promulgated air quality designations 
nationwide for all but three areas for the 2006 24-hour fine particle 
(PM2.5) National Ambient Air Quality Standards (NAAQS). This 
rule takes several additional actions related to the 2006 24-hour 
PM2.5 NAAQS designations. It establishes the initial 
PM2.5 air quality designations for three areas (Pinal 
County, Arizona; Plumas County, California; and Shasta County, 
California) and their respective surrounding counties that EPA deferred 
in the November 13, 2009 promulgated designations. Plumas and Shasta 
counties and their surrounding counties are being designated 
``unclassifiable/attainment,'' while a portion of Pinal County is being 
designated as ``nonattainment.'' This action also includes a 110(k)(6) 
error correction (affecting Ravalli, Montana) and a technical 
correction (affecting Knoxville, Tennessee) related to the 2006 24-hour 
PM2.5 NAAQS designations. Finally, in this action, EPA 
announces its decision to retain the current designation of 
unclassifiable/attainment for Harris County, Texas and Pinal County, 
Arizona for the 1997 annual PM2.5 NAAQS.

DATES: Effective Date: The effective date of this rule is March 7, 
2011.

ADDRESSES: The EPA has established two dockets for the actions 
contained in this final rule. Docket ID No. EPA-HQ-OAR-2007-0562 
contains documents related to the initial designations for the three 
areas (Pinal County, Arizona; Plumas County, California; and Shasta 
County, California and their respective surrounding counties) for the 
2006 24-hour PM2.5 NAAQS. Docket ID No.

[[Page 6057]]

EPA-HQ-OAR-2010-0163 contains documents related to the potential 
redesignation process for two areas (Harris County, Texas and Pinal 
County, Arizona) for the 1997 annual PM2.5 NAAQS. All 
documents contained in both dockets are listed in the index at http://www.regulations.gov. Although listed in the index, some information is 
not publicly available, i.e., Confidential Business Information (CBI) 
or other information whose disclosure is restricted by statute. Certain 
other material, such as copyrighted material, is not placed on the 
Internet and will be publicly available only in hard copy form. 
Publicly available docket materials are available either electronically 
in the docket or in hard copy at the Docket, EPA/DC, EPA West, Room 
3334, 1301 Constitution Ave., NW., Washington, DC. The Public Reading 
Room is open from 8:30 a.m. to 4:30 p.m. Monday through Friday, 
excluding legal holidays. The telephone number for the Public Reading 
Room is (202) 566-1744, and the telephone number for the Office of Air 
and Radiation Docket and Information Center is (202) 566-1742.
    In addition, EPA has established a Web site for this rulemaking at: 
http://www.epa.gov/pmdesignations/2006standards/index.htm. The Web site 
includes EPA's final State and Tribal designations, as well as State 
initial recommendation letters, EPA modification letters, technical 
support documents, responses to comments, and other related technical 
information.

FOR FURTHER INFORMATION CONTACT: Beth W. Palma, Office of Air Quality 
Planning and Standards, U.S. Environmental Protection Agency, Mail Code 
C539-04, Research Triangle Park, NC 27711, phone number (919) 541-5432 
or by e-mail at: [email protected] or Carla Oldham, Office of Air 
Quality Planning and Standards, U.S. Environmental Protection Agency, 
Mail Code C539-04, Research Triangle Park, NC, 27711, phone number 
(919) 541-3347 or by e-mail at: [email protected].

Regional Office Contacts

    Region 4--Steve Scofield (404) 562-9034.
    Region 6--Joe Kordzi (214) 665-7186.
    Region 8--Catherine Roberts (303) 312-6025.
    Region 9--Ginger Vagenas (415) 972-3964.

SUPPLEMENTARY INFORMATION: 
    The public may inspect the rule and the technical support 
information by contacting staff listed below at the following 
locations:

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             Regional offices                     Affected states
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Richard A. Schutt, Chief, Air Planning     Tennessee.
 Branch, EPA Region 4, Sam Nunn Atlanta
 Federal Center, 61 Forsyth, Street, SW.,
 12th Floor, Atlanta, GA 30303, (404) 562-
 9033.
Guy Donaldson, Chief, Air Planning         Texas.
 Section, EPA Region 6, 1445 Ross Avenue,
 Dallas, TX 75202, (214) 665-7242.
Monica Morales, Chief, Air Quality         Montana.
 Planning Unit, EPA Region 8, 1595
 Wynkoop Street, Denver, CO 80202-1129,
 (303) 312-6936.
Lisa Hanf, Chief, Air Planning Office,     Arizona and California.
 EPA Region 9, 75 Hawthorne Street, San
 Francisco, CA 94105, (415) 972-3854.
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Table of Contents

    The following is an outline of the Preamble.

I. Preamble Glossary of Terms and Acronyms
II. What is the purpose of this action?
III. What are the 2006 24-hour PM2.5 NAAQS designations 
promulgated in this action?
IV. 110(k)(6) Error Correction Related to the 2006 24-Hour 
PM2.5 NAAQS Designations
V. Technical Correction Related to the 2006 24-Hour PM2.5 
NAAQS Designations
VI. What is the status of possible redesignations to nonattainment 
for Harris County, Texas, and Pinal County, Arizona, for the 1997 
annual PM2.5 NAAQS?
VII. Significance of This Action
VIII. Where can I find information forming the basis for this rule 
and exchanges between EPA, States, and Tribes related to this rule?
IX. Statutory and Executive Order Reviews
    A. Executive Order 12866: Regulatory Planning and Review
    B. Paperwork Reduction Act
    C. Regulatory Flexibility Act
    D. Unfunded Mandates Reform Act
    E. Executive Order 13132: Federalism
    F. Executive Order 13175: Consultation and Coordination With 
Indian Tribal Governments
    G. Executive Order 13045: Protection of Children From 
Environmental Health and Safety Risks
    H. Executive Order 13211: Actions That Significantly Affect 
Energy Supply, Distribution, or Use
    I. National Technology Transfer and Advancement Act (NTTAA)
    J. Executive Order 12898: Federal Actions to Address 
Environmental Justice in Minority Populations and Low-Income 
Populations
    K. Congressional Review Act
    L. Judicial Review

I. Preamble Glossary of Terms and Acronyms

    The following are abbreviations of terms used in the preamble.

APA Administrative Procedure Act
AQS Air Quality System
CAA Clean Air Act
CBSA Core Based Statistical Area
CFR Code of Federal Regulations
DC District of Columbia
EER Exceptional Events Rule
EO Executive Order
EPA Environmental Protection Agency
FR Federal Register
NAAQS National Ambient Air Quality Standards
NTTAA National Technology Transfer Advancement Act
OMB Office of Management and Budget
RFA Regulatory Flexibility Act
SIP State Implementation Plan
[micro]g/m\3\ micrograms per cubic meter
UMRA Unfunded Mandate Reform Act of 1995
TAR Tribal Authority Rule
U.S. United States
VCS Voluntary Consensus Standards

II. What is the purpose of this action?

    At the time that EPA finalized designations for the 2006 24-hour 
PM2.5 NAAQS on November 13, 2009 (74 FR 58688), EPA deferred 
designations for three areas to evaluate further the reason for their 
high fine particle concentrations during 2006-2008, a period which 
indicated possible new violating monitors in Pinal County, Arizona; 
Plumas County, California; and Shasta County, California. To determine 
what areas might be contributing to these potential violations, EPA 
also deferred initial designations for the following nearby counties: 
(i) In Arizona, the counties of Cochise, Gila, Graham, La Paz, 
Maricopa, Pima, Yavapai, and Yuma; and (ii) in California, the counties 
of Butte, Lassen, Modoc, Sierra, Siskiyou, Tehama, Trinity, and Yuba. 
EPA also deferred designations for Indian Country located within or 
near these counties.
    The purpose of this action is to promulgate designations for the 
areas described above, including Indian Country not specifically 
excluded, in accordance with the requirements of Clean Air Act (CAA) 
section 107(d). The lists of areas in each State and in Indian Country, 
and the designation for each area, appear in the tables at the end of 
this final rule (amendments to 40 CFR 81.300-356). In particular, EPA 
is designating as ``nonattainment'' for the 2006 24-hour 
PM2.5 NAAQS of 35 [micro]g/m\3\ State lands in a portion of 
Pinal County,

[[Page 6058]]

Arizona.\1\ The basis for establishing this partial county as 
nonattainment is monitored air quality data for 2006-2008 indicating a 
violation of the NAAQS.\2\ For the designated Pinal County 
nonattainment area, Arizona must develop a State Implementation Plan 
(SIP) that provides for attainment of the NAAQS as expeditiously as 
practicable, in accordance with the requirements of the CAA and 
applicable EPA regulations. Pursuant to CAA section 172(b), EPA is 
announcing that this plan must be submitted no later three years from 
the effective date of these designations.
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    \1\ By ``State lands'' we mean all land within the State 
boundary that is not within Indian County, including privately and 
Federally owned land.
    \2\ 2007-2009 data also show the area to be in violation of the 
2006 24-hour PM2.5 NAAQS.
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    Such plan must meet the requirements of section 172(c). EPA's 
current implementation regulations for PM2.5 at 40 CFR 
section 51.1000-1012 apply only to the 1997 PM2.5 NAAQS. EPA 
is considering amending those regulations to encompass the 2006 24-hour 
PM2.5 NAAQS and to address any other revisions to the 
regulations that are necessary for these new standards. However, EPA 
anticipates that the SIP requirements for the 2006 PM2.5 
NAAQS should be comparable to those for the 1997 PM2.5 
NAAQS, so that the regulations at sections 51.1000-1012 can be used as 
guidance for SIP planning for the 2006 PM2.5 NAAQS, to the 
extent appropriate, pending any revisions to the regulations. For those 
areas designated unclassifiable/attainment, States are not required to 
develop a SIP to meet the requirements of section 172(c), but States 
must meet other statutory and regulatory requirements to prevent 
significant deterioration of air quality in those areas as well as 
applicable infrastructure requirements of section 110(a). EPA continues 
to defer the designations associated with Tribal lands in or near the 
designated nonattainment area in Pinal County, Arizona, to allow for 
completion of the Tribal consultation process.
    After further review of air quality monitoring data, including an 
evaluation of exceptional event claims, EPA is also designating as 
``unclassifiable/attainment'' the remaining two areas (Plumas County, 
California; Shasta County, California; and eight nearby counties) for 
which we previously deferred the initial air quality designation for 
the 2006 24-hour PM2.5 NAAQS.
    When EPA promulgated the initial air quality designations in the 
November 13, 2009 notice (74 FR 58688), we also announced that our 
review of 2006-2008 monitoring data for the annual PM2.5 
NAAQS indicated that two areas initially designated as 
``unclassifiable/attainment'' for the 1997 annual PM2.5 
NAAQS (Harris County, Texas and Pinal County, Arizona) were violating 
those NAAQS based on these years of data. After further review of these 
data, EPA is announcing in this action that we are retaining the 
designation of ``unclassifiable/attainment'' for both areas for the 
1997 annual PM2.5 NAAQS, for the reasons explained below.

III. What are the 2006 24-hour PM2.5 NAAQS designations 
promulgated in this action?

    Designations for the Pinal County, Arizona area based on 2006-2008 
data. In this action, EPA is designating as ``nonattainment'' a portion 
of State lands in Pinal County, Arizona. The basis for establishing 
this partial county as nonattainment is monitored air quality data for 
2006-2008 indicating a violation of the NAAQS (2006-2008 design value 
of 48 micrograms per cubic meter ([micro]g/m\3\)).\3\ EPA is 
designating the remainder of Pinal County, Cochise, Gila, Graham, La 
Paz, Maricopa, Pima, Yavapai, and Yuma counties, and, except as noted 
below, Indian Country located within those areas, as ``unclassifiable/
attainment.'' EPA is deferring designation of the Gila River Indian 
Community reservation, which is located in Pinal and Maricopa counties 
adjacent to the new nonattainment area, and the Ak-Chin Indian 
Community reservation, which is surrounded by the newly designated 
nonattainment portion of Pinal County, to allow for the completion of 
the Tribal consultation process.
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    \3\ 2007-2009 data also show this area to be in violation of the 
2006 24-hour PM2.5 NAAQS, with a 2007-2009 design value 
of 40 [micro]g/m\3\.
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    In October of 2009, EPA notified the Governor of Arizona and Tribal 
leaders of Tribes with lands located in Pinal and Maricopa counties 
that a monitor in Pinal County was violating the 2006 24-hour 
PM2.5 standards based on the most recent (2006-2008) air 
quality monitoring data. Due to this new violation, and due to the need 
for additional time to collect data and evaluate the area to determine 
an appropriate nonattainment area boundary, EPA decided to defer the 
area designation of Pinal County, Maricopa County (the other county 
comprising the Phoenix-Mesa-Scottsdale core-based statistical area 
(CBSA)), and the seven nearby counties (Cochise, Gila, Graham, La Paz, 
Pima, Yavapai, and Yuma Counties) surrounding the Phoenix-Mesa-
Scottsdale CBSA,\4\ for the 2006 24-hour PM2.5 standards.
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    \4\ As described in EPA's rule promulgating initial 
PM2.5 designations for the 2006 24-hour standards, in 
evaluating areas potentially contributing to a monitored violation, 
EPA examined those counties located in the surrounding metropolitan 
statistical area (in this case, Pinal and Maricopa counties), and 
those nearby counties one or two adjacent rings beyond. See ``Air 
Quality Designations for the 2006 24-hour Fine Particle 
(PM2.5) National Ambient Air Quality Standards,'' 74 FR 
58688, November 13, 2009, page 58694.
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    EPA then followed the designations process set forth in section 
107(d) of the CAA which included sending letters in April and May of 
2010 to affected States and Tribes notifying them of EPA's intentions 
with respect to potential modification of the initial designation 
recommendations of the State or Tribe. EPA also followed the guidance 
issued in June of 2007 related to boundary determinations for 
nonattainment areas for the 2006 24-hour PM2.5 NAAQS.\5\ In 
keeping with this guidance, EPA completed a 9-factor analysis \6\ 
documented in the final Pinal County, Arizona Area Designation for the 
2006 24-hour Fine Particle National Ambient Air Quality Standard 
Technical Support Document dated May 5, 2010, and supplemented by the 
Addendum to EPA's May 5, 2010 Technical Support Document: Pinal County, 
Arizona Area Designation for the 2006 24-hour Fine Particle National 
Ambient Air Quality Standard.
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    \5\ ``Area Designations for the Revised 24-Hour Fine Particle 
National Ambient Air Quality Standards,'' memorandum to Regional 
Administrators, Regions 1-10, from Robert J. Meyers, Acting 
Assistant Administrator, OAR, dated June 8, 2007.
    \6\ The 9-factor analysis includes assessment of emission data, 
air quality data, population density and degree of urbanization, 
traffic and commuting patterns, growth rates and patterns, 
meteorology (weather/transport patterns), geography/topography 
(mountain ranges or other air basin boundaries), jurisdictional 
boundaries (e.g., counties, air districts, Reservations, 
metropolitan planning organizations), and level of control of 
emission sources.
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    In a letter dated July 19, 2010, the Governor of Arizona responded 
to EPA's May 10, 2010 notification of the need for a modification to 
the State's initial designation in order to designate a portion of 
Pinal County ``nonattainment'' for the 2006 24-hour PM2.5 
NAAQS. The Governor disagreed with EPA's modification, but also 
provided a revised recommendation with a suggested boundary for the 
nonattainment area in Pinal County. This revised recommendation from 
the State was smaller than the boundary EPA originally proposed in its 
May 5, 2010 Technical Support Document. In support of the Governor's 
alternative boundary, the Arizona Department of Environmental Quality 
(ADEQ)

[[Page 6059]]

submitted a technical report entitled Arizona Air Quality Designations, 
Technical Support Document, Boundary Recommendation for the Pinal 
County 24-hour Standard PM2.5 Nonattainment Area dated July 
13, 2010 (ADEQ's technical report).
    EPA has reviewed the Governor's July 19, 2010 letter and ADEQ's 
technical report and with this action is finalizing a revised boundary 
determination that includes the sources of PM2.5 and 
PM2.5 precursor emissions that contribute to air quality 
violations at the violating monitor. The final partial Pinal County, 
Arizona nonattainment area remains larger than the area recommended in 
the July 19, 2010 letter from the Governor but now excludes the Table 
Top Wilderness Area. Upon further analysis, and consistent with the 
State's recommendation, we have determined that this wilderness area 
does not contain sources of PM2.5 and PM2.5 
precursor emissions contributing to the exceedances of the NAAQS 
measured at the violating monitor.
    All correspondence and supporting documentation related to deferred 
final designations can be found in docket ID No. EPA-HQ-OAR-2007-0562.
    Designations for the Plumas County, California, and Shasta County, 
California, areas based on 2006-2008 data. After further review of air 
quality monitoring data, including an evaluation of submitted 
exceptional event claims, EPA is designating as ``unclassifiable/
attainment'' the remaining two areas for which the initial air quality 
designation was deferred for the 2006 24-hour PM2.5 NAAQS.
    As described in the November 13, 2009 notice, the monitors located 
in two areas, Plumas County, California (2006-2008 24-hour design value 
of 49 [micro]g/m\3\) and Shasta County, California (2006-2008 24-hour 
design value of 48 [micro]g/m\3\) appeared to be in violation of the 
2006 24-hour PM2.5 NAAQS with the inclusion of 2008 
monitoring data. In light of this new data indicating a violation, EPA 
decided to take additional time to evaluate the areas to determine 
whether there was a violation and, if so, what the nonattainment area 
boundaries should be for such areas. EPA determined that this 
additional time would also permit the Agency and California to confer 
on appropriate area boundaries in accordance with the process 
contemplated in section 107(d). In addition, the California Air 
Resources Board (CARB) had submitted exceptional event claims that, if 
concurred upon by EPA, had the potential to impact the designations for 
the two identified areas.
    Further evaluation of the monitoring data from Plumas County and 
Shasta County indicate that these areas were not violating the 2006 24-
hour PM2.5 NAAQS based on 2006-2008 data, due to exceptional 
events that affected the monitors. On March 22, 2007, EPA adopted a 
final rule, Treatment of Data Influenced by Exceptional Events (72 FR 
13560), also known as the Exceptional Events Rule (EER), to govern the 
review and handling of certain air quality monitoring data for which 
the normal planning and regulatory processes are not appropriate. Under 
the EER, EPA may exclude data from use in determinations of NAAQS 
exceedances and violations if a State demonstrates that an 
``exceptional event'' caused the exceedances. Before EPA can exclude 
data from these regulatory determinations, the State must flag the data 
in EPA's Air Quality System (AQS) database and, after notice and 
opportunity for public comment, submit a demonstration to justify the 
exclusion. After considering the weight of evidence provided in the 
demonstration, EPA decides whether or not to concur with each flagged 
value.
    On June 17, 2009, CARB submitted a preliminary demonstration for a 
high PM2.5 event that occurred at the Plumas County Portola 
monitor on July 8, 2007. Additional clarification concerning this event 
was submitted to EPA via e-mail on December 22, 2009. On August 28, 
2009, CARB submitted additional event-related preliminary demonstration 
documentation for high PM2.5 events that occurred at various 
monitoring locations throughout California on 27 separate days during 
the summer of 2008. Additional clarification concerning these events 
was submitted to EPA via e-mail on January 19, 2010 and January 26, 
2010.
    EPA reviewed these demonstration submittals, and subsequently 
concurred, that specific wildfire-related events caused exceedances of 
the 24-hour PM2.5 standard on July 8, 2007 at the Portola 
monitor in Plumas County; at the Redding, Shasta County monitor on June 
23, June 29, July 5, July 17, and July 23, 2008; at the Portola, Plumas 
County monitor on June 23, June 26, July 11, and July 23, 2008; and at 
the Quincy, Plumas County monitor on June 23, June 26, July 8, July 11, 
and July 19, 2008.7 8 EPA's evaluation of these events is 
documented in the Review of Evidence Regarding Claimed Exceptional 
Events Leading to 24-hour PM2.5 Exceedances: Plumas County, CA (July 8, 
2007) technical support document dated March 11, 2010, the Review of 
Evidence Regarding Claimed Exceptional Events Leading to 24-hour PM2.5 
Exceedances: Shasta County, CA (June 23, 2008 and July 23, 2008) and 
Plumas County, CA (June 23, 2008; June 26, 2008; July 11, 2008; July 
19, 2008; and July 23, 2008) technical support document dated March 11, 
2010, and the Review of Evidence Regarding Claimed Exceptional Events 
Leading to 24-hour PM2.5 Exceedances: Shasta County, CA 
(June 29, 2008; July 5, 2008; and July 17, 2008) and Plumas County, CA 
(June 26, 2008; July 8, 2008; and July 11, 2008) technical support 
document dated March 30, 2010.
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    \7\ Letter from Jared Blumenfeld, Regional Administrator, EPA 
Region 9, to Mary D. Nichols, California Air Resources Board, dated 
March 11, 2010.
    \8\ Letter from Jared Blumenfeld, Regional Administrator, EPA 
Region 9, to Mary D. Nichols, California Air Resources Board, dated 
April 2, 2010.
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    Concurrence on these events resulted in revised 2006-2008 design 
values for Plumas County, California (2006-2008 24-hour design value of 
34 [micro]g/m\3\) and for Shasta County, California (2006-2008 24-hour 
design value of 24 [micro]g/m\3\). Because the monitoring data for 
Plumas County and Shasta County are below the level of the NAAQS, EPA 
has determined that the initial designation for these counties should 
be ``unclassifiable/attainment.'' As a result of these two counties 
being in attainment of these NAAQS, other nearby counties for which we 
had deferred designations are not contributing to any violation of the 
NAAQS in a nearby area. Accordingly, EPA has determined that an initial 
designation of ``unclassifiable/attainment'' is appropriate for the 
counties of Butte, Lassen, Shasta, Sierra, Tehama and Yuba (nearby to 
Plumas) and for Lassen, Modoc, Plumas, Siskiyou, Tehama, and Trinity 
(nearby to Shasta) for the 2006 24-hour PM2.5 NAAQS.\9\
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    \9\ 2007-2009 data also show Shasta and Plumas Counties in 
attainment of the 2006 24-hour PM2.5 NAAQS with 2007-2009 
design values of 21 [micro]g/m\3\ (Shasta County) and 34 [micro]g/
m\3\ (Plumas County).
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IV. 110(k)(6) Error Correction Related to the 2006 24-Hour 
PM2.5 NAAQS Designations

    This action includes a 110(k)(6) error correction related to the 
designation classification for Ravalli, Montana. In the November 13, 
2009 action, Ravalli, Montana was designated as ``unclassifiable'' 
rather than ``unclassifiable/attainment.'' This error was the result of 
incorrectly processing and calculating the ambient air monitoring data 
for Ravalli, Montana. The errant calculations resulted in the 
inaccurate designation of

[[Page 6060]]

``unclassifiable.'' Once the appropriate data substitutions were made 
and the data were recalculated, we determined that the designation 
should have been ``unclassifiable/attainment.'' The correction made by 
EPA in this action is identified in the table at the end of this notice 
and the change will be reflected in a revision of 40 CFR part 81.

V. Technical Correction Related to the 2006 24-Hour PM2.5 
NAAQS Designations

    In this rule, EPA is also making a minor technical correction to 
the name of the Knoxville, Tennessee nonattainment area included in the 
November 13, 2009 action (74 FR 58688). The name of the Knoxville, 
Tennessee nonattainment area is being changed in 40 CFR part 81 to be 
the Knoxville-Sevierville-La Follette, Tennessee nonattainment area to 
correspond with the name of the CBSA and to provide an accurate area 
name in the Code of Federal Regulations. The correction made by EPA in 
this action is identified in the table at the end of this notice and 
the change will be reflected in a revision of 40 CFR part 81.

VI. What is the status of possible redesignations to nonattainment for 
Harris County, Texas, and Pinal County, Arizona, for the 1997 annual 
PM2.5 NAAQS?

    When EPA promulgated the initial air quality designations in the 
November 13, 2009 notice (74 FR 58688), we announced that our review of 
quality assured, certified air quality monitoring data for 2006-2008 
indicated that two counties designated ``unclassifiable/attainment'' 
for the 1997 annual PM2.5 NAAQS of 15 [micro]g/m\3\ had 
monitors that were now potentially violating that NAAQS. The 
potentially violating counties were identified as Pinal County, Arizona 
(2006-2008 annual average design value of 21.6 [micro]g/m\3\) and 
Harris County, Texas (2006-2008 annual average design value of 15.2 
[micro]g/m\3\). Upon further review, EPA is announcing in this action 
that we are retaining the designation of ``unclassifiable/attainment'' 
for both areas. The rationale for these decisions is provided below.
    In Pinal County, Arizona, EPA identified the ``Cowtown'' monitor 
(AQS ID: 04-021-3013) as the monitor potentially violating the 1997 
annual PM2.5 NAAQS. However, EPA has subsequently concluded 
that the monitor in question is not suitable for determining compliance 
with these NAAQS. As documented in EPA's Technical Support Document for 
Determination that the Cowtown Monitor is Ineligible for Comparison 
with the Annual PM2.5 NAAQS dated April 26, 2010, EPA evaluated the 
comparability of data from the Cowtown site to the 1997 annual 
PM2.5 standard on four criteria: the monitoring objective, 
the spatial scale of representativeness, localized hot spot conditions, 
and the uniqueness of the site. EPA determined that data from the 
Cowtown monitor are ineligible for comparison to the annual 
PM2.5 NAAQS because the monitor functions as a population-
oriented microscale (i.e., localized hot spot) monitor. EPA regulations 
provide that monitors at ``relatively unique population-oriented 
microscale, or localized hot spot, or unique population-oriented 
middle-scale impact sites'' are only eligible for comparison to the 24-
hour PM2.5 NAAQS, not the annual PM2.5 NAAQS (40 
CFR 58.30). No other monitoring site in Pinal County has shown a 
violation of the 1997 annual PM2.5 NAAQS in either the 2006-
2008 or 2007-2009 timeframes. In the absence of monitoring data 
suitable for comparison to the 1997 annual PM2.5 NAAQS 
showing a violation of that standard, EPA has determined that it is 
appropriate to retain the current designation of ``unclassifiable/
attainment'' for Pinal County, Arizona for these NAAQS.\10\
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    \10\ 2007-2009 data show that all other Pinal County monitors 
are in attainment of the 1997 annual PM2.5 NAAQS.
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    In Harris County, Texas, EPA identified the ``Clinton Drive'' 
monitor (AQS ID: 48-201-1035) as potentially violating the 1997 annual 
PM2.5 NAAQS. However, EPA has determined that monitor is no 
longer violating the 1997 annual PM2.5 NAAQS based on a 
review of complete, quality-assured, certified 2007-2009 data resulting 
in an annual average design value of 14.1 [micro]g/m\3\. On October 8, 
2009, EPA Region 6 notified the Governor of Texas of EPA's intention to 
designate Harris County, Texas as ``nonattainment'' for the 1997 annual 
PM2.5 NAAQS based on 2006-2008 monitoring data and requested 
that the State provide recommendations for the intended redesignation. 
As part of the review and recommendation process, Texas completed an 
expedited review and submittal of 2009 air quality monitoring data into 
AQS. The result of this additional data was the recalculation of Harris 
County, Texas design values based on 2007-2009 complete, quality-
assured, certified data for 2007-2009. In a letter dated February 4, 
2010, to the Region 6 EPA Regional Administrator, the Governor of Texas 
subsequently recommended that all areas in Texas that have monitors 
with data eligible for comparison to the 1997 annual PM2.5 
NAAQS be classified as unclassifiable/attainment. Because EPA believes 
that inclusion of the most recent air quality monitoring data available 
is appropriate for redesignation decisions, EPA agreed with the State's 
unclassifiable/attainment recommendation for Harris County, Texas and, 
with this action, announces its decision to retain the current 
unclassifiable/attainment status for Harris County, Texas for the 1997 
annual PM2.5 NAAQS.\11\
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    \11\ Letter from Al Armendariz, Regional Administrator, EPA 
Region 6, to Rick Perry, Governor of Texas, dated April 28, 2010.
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    All correspondence and supporting documentation related to the 
potential redesignations for the 1997 annual PM2.5 NAAQS can 
be found in docket ID No. EPA-HQ-OAR-2010-0163.

VII. Significance of This Action

    In accordance with the foregoing discussion, EPA is promulgating 
the initial designations for the 2006 24-hour PM2.5 NAAQS 
for certain areas in Arizona and California. EPA is also making two 
corrections related to the 2006 24-hour PM2.5 NAAQS 
designations. The first correction is a 110(k)(6) error correction 
related to the designation classification for Ravalli, Montana. The 
second correction involves a technical correction to the name of the 
Knoxville, Tennessee nonattainment area included in the November 13, 
2009 action. Finally, EPA is determining that it is not necessary to 
redesignate areas in Texas and Arizona to nonattainment for the 1997 
annual PM2.5 NAAQS.
    The designations and corrections made by EPA in this action with 
respect to the 2006 24-hour PM2.5 NAAQS relate to the other 
designations that EPA promulgated in the November 13, 2009 action (74 
FR 58688). The designations and corrections made by EPA in this rule, 
related to the 24-hour PM2.5 standard, are set forth in the 
tables at the end of this notice and will change the designation status 
or area description for the affected areas in 40 CFR part 81 initially 
announced in the November 13, 2009, action. States with areas 
designated as ``nonattainment'' for the 24-hour PM2.5 NAAQS 
are required to submit SIPs addressing nonattainment area requirements 
within three years of designation, pursuant to section 172 of the CAA. 
Therefore, within three years following the March 7, 2011 effective 
date for the designations identified in this rulemaking, Arizona will 
be required to

[[Page 6061]]

submit a SIP for the Pinal County nonattainment area.

VIII. Where can I find information forming the basis for this rule and 
exchanges between EPA, States, and Tribes related to this rule?

    Information providing the basis for the actions and decisions in 
this notice, including Technical Support Documents, applicable EPA 
guidance memoranda, and copies of correspondence regarding this process 
between EPA and the States and Tribes are available in the identified 
dockets. All docket information is available for review at the EPA 
Docket Center listed above in the ADDRESSES section of this document 
and on our designation Web site at http://www.epa.gov/pmdesignations/2006standards/index.htm. Other related State-specific information is 
available at the EPA Regional Offices.

IX. Statutory and Executive Order Reviews

    Upon promulgation of a new or revised NAAQS, the CAA requires EPA 
to designate areas as attaining or not attaining the NAAQS. The CAA 
then specifies requirements for areas based on whether such areas are 
attaining or not attaining the NAAQS. In this final rule, EPA assigns 
designations to areas as required.

A. Executive Order 12866: Regulatory Planning and Review

    This action is not a ``significant regulatory action'' under the 
terms of Executive Order (EO) 12866 (58 FR 51735, October 4, 1993) and 
is therefore not subject to review under the EO.

B. Paperwork Reduction Act

    This action does not impose an information collection burden under 
the provisions of the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. 
Burden is defined at 5 CFR 1320.3(b). This rule responds to the 
requirement to promulgate air quality designations after promulgation 
of a NAAQS. This requirement is prescribed in the CAA section 107 of 
title 1. The present final rule does not establish any new information 
collection apart from that required by law.

C. Regulatory Flexibility Act

    This final rule is not subject to the Regulatory Flexibility Act 
(RFA), which generally requires an agency to prepare a regulatory 
flexibility analysis for any rule that will have a significant economic 
impact on a substantial number of small entities. The RFA applies only 
to rules subject to notice and comment rulemaking requirements under 
the Administrative Procedure Act (APA) or any other statute. This rule 
is not subject to notice and comment requirements under the APA or any 
other statute because the rule is not subject to the APA and is subject 
to CAA section 107(d)(2)(B), which does not require that the Agency 
issue a notice of proposed rulemaking before issuing this rule.

D. Unfunded Mandates Reform Act

    This action contains no Federal mandate under the provisions of 
Title II of the Unfunded Mandates Reform Act of 1995 (UMRA), 2 U.S.C. 
1531-1538 for State, local, or Tribal governments or the private 
sector. The action imposes no enforceable duty on any State, local or 
Tribal governments or the private sector. Therefore, this action is not 
subject to the requirements of sections 202 and 205 of the UMRA.
    This action is also not subject to the requirements of section 203 
of UMRA because it contains no regulatory requirements that might 
significantly or uniquely affect small governments. It does not create 
any additional requirements beyond those of the PM2.5 NAAQS 
(40 CFR 50.13), therefore, no UMRA analysis is needed. This rule 
establishes the application of the PM2.5 standard and the 
designation for each area of the country for the PM2.5 
NAAQS. The CAA requires States to develop plans, including control 
measures, based on their designations and classifications.
    One mandate that may apply as a consequence of this action to the 
portion of Pinal County, Arizona being designated as ``nonattainment'' 
is the requirement under CAA section 176(c) and associated regulations 
to demonstrate conformity of Federal actions to SIPs. These rules apply 
to Federal agencies and Metropolitan Planning Organizations making 
conformity determinations. The EPA concludes that such conformity 
determinations will not cost $100 million or more in the aggregate.
    The EPA believes that any new controls imposed as a result of this 
action will not cost in the aggregate $100 million or more annually. 
Thus, this Federal action will not impose mandates that will require 
expenditures of $100 million or more in the aggregate in any one year.
    Nonetheless, EPA carried out consultation with government entities 
affected by this rule, including States, Tribal governments, and local 
air pollution control agencies.

E. Executive Order 13132: Federalism

    Executive Order 13132, entitled ``Federalism'' (64 FR 43255, August 
10, 1999), requires EPA to develop an accountable process to ensure 
meaningful and timely input by State and local officials in the 
development of regulatory policies that have federalism implications. 
``Policies that have federalism implications'' is defined in the 
Executive Order to include regulations that have ``substantial direct 
effects on the States, or the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government.''
    This final rule does not have federalism implications. It will not 
have substantial direct effects on the States, on the relationship 
between the national government and the States, or on the distribution 
of power and responsibilities among the various levels of government, 
as specified in Executive Order 13132. The CAA establishes the process 
whereby States take the lead in developing plans to meet the NAAQS. 
This rule will not modify the relationship of the States and EPA for 
purposes of developing programs to implement the NAAQS. Thus, Executive 
Order 13132 does not apply to this rule.

F. Executive Order 13175: Consultation and Coordination With Indian 
Tribal Governments

    Executive Order 13175, entitled ``Consultation and Coordination 
with Indian Tribal Governments'' (65 FR 67249, November 2, 2000), 
requires EPA to develop an accountable process to ensure ``meaningful 
and timely input by Tribal officials in the development of regulatory 
policies that have Tribal implications.'' This action does not have 
Tribal implications, as specified in Executive Order 13175 (65 FR 
67249, November 9, 2000). This rule concerns the designation and 
classification of areas as ``attainment'' and ``nonattainment'' for the 
2006 24-hour PM2.5 NAAQS. The CAA provides for States and 
eligible Tribes to develop plans to regulate emissions of air 
pollutants within their areas based on their designations. The Tribal 
Authority Rule (TAR) provides Tribes the opportunity to apply for 
eligibility to develop and implement CAA programs such as programs to 
attain and maintain the PM2.5 NAAQS, but it leaves to the 
discretion of the Tribe the decision of whether to apply to develop 
these programs and which programs, or appropriate elements of a 
program, the Tribe will seek to adopt. This rule does

[[Page 6062]]

not have a substantial direct effect on one or more Indian Tribes. It 
does not create any additional requirements beyond those of the 
PM2.5 NAAQS (40 CFR section 50.13). This rule establishes 
the application of the PM2.5 standard and the designation 
and classification for certain areas of the country for the 
PM2.5 NAAQS. Additionally, no Tribe has implemented a CAA 
program to attain the PM2.5 NAAQS at this time. Furthermore, 
this rule does not affect the relationship or distribution of power and 
responsibilities between the Federal government and Indian Tribes. The 
CAA and the TAR establish the relationship of the Federal government 
and Tribes in developing plans to attain the NAAQS, and this rule does 
nothing to modify that relationship. Because this rule does not have 
Tribal implications, Executive Order 13175 does not apply.
    Although Executive Order 13175 does not apply to this rule, EPA 
communicated with Tribal leaders and environmental staff regarding the 
designations process. EPA also sent individualized letters to all 
Federally recognized Tribes to explain the designation process for the 
2006 24-hour PM2.5 NAAQS, to provide the EPA designations 
guidance, and to offer consultation with EPA. EPA provided further 
information to Tribes through presentations at the National Tribal 
Forum and through participation in National Tribal Air Association 
conference calls. EPA also sent individualized letters to all Federally 
recognized Tribes about EPA's intended areas area designations for the 
24-hour PM2.5 standards and offered Tribal leaders the 
opportunity for consultation. These communications provided 
opportunities for Tribes to voice concerns to EPA about the general 
designations process for the 24-hour PM2.5 NAAQS, as well as 
concerns specific to a Tribe, and informed EPA about key Tribal 
concerns regarding designations as the rule was under development.

G. Executive Order 13045: Protection of Children From Environmental 
Health and Safety Risks

    The action is not subject to Executive Order 13045 (62 FR 19885, 
April 23, 1997) because it is not economically significant as defined 
in Executive Order 12866, and because EPA does not have reason to 
believe that the environmental health risks or safety risks addressed 
by this rule present a disproportionate risk or safety risk to 
children. Nonetheless, we have evaluated the environmental health or 
safety effects of the PM2.5 NAAQS on children. The results 
of this risk assessment are contained in the NAAQS for the 2006 24-hour 
PM2.5, Final Rule (October 17, 2006, 71 FR 61144).

H. Executive Order 13211: Actions That Significantly Affect Energy 
Supply, Distribution, or Use

    This action is not subject to Executive Order 13211 (66 FR 28355 
(May 22, 2001)), because it is not a significant regulatory action 
under Executive Order 12866.

I. National Technology Transfer and Advancement Act (NTTAA)

    Section 12(d) of the NTTAA of 1995, Public Law 104-113, section 
12(d) (15 U.S.C. 272 note) directs EPA to use voluntary consensus 
standards (VCS) in its regulatory activities unless to do so would be 
inconsistent with applicable law or otherwise impracticable. Voluntary 
consensus standards are technical standards (e.g., materials 
specifications, test methods, sampling procedures, and business 
practices) that are developed or adopted by VCS bodies. The NTTAA 
directs EPA to provide Congress, through OMB, explanations when the 
Agency decides not to use available and applicable VCS.
    This action does not involve technical standards. Therefore, EPA 
did not consider the use of any VCS.

J. Executive Order 12898: Federal Actions to Address Environmental 
Justice in Minority Populations and Low-Income Populations

    Executive Order 12898 (59 FR 7629 (Feb. 16, 1994)) establishes 
Federal executive policy on environmental justice. Its main provision 
directs Federal agencies, to the greatest extent practicable and 
permitted by law, to make environmental justice part of their mission 
by identifying and addressing, as appropriate, disproportionately high 
and adverse human health or environmental effects of their programs, 
policies, and activities on minority populations and low-income 
populations in the U.S.
    The EPA has determined that this final rule will not have 
disproportionately high and adverse human health or environmental 
effects on minority or low-income populations because this rule does 
not affect the level of protection provided to human health or the 
environment.

K. Congressional Review Act

    The Congressional Review Act, 5 U.S.C. 801 et seq., as added by the 
Small Business Regulatory Enforcement Fairness Act of 1996, generally 
provides that before a rule may take effect, the agency promulgating 
the rule must submit a rule report, which includes a copy of the rule, 
to each House of the Congress and to the Comptroller General of the 
U.S. The EPA will submit a report containing this rule and other 
required information to the U.S. Senate, the U.S. House of 
Representatives, and the Comptroller General of the U.S. prior to 
publication of the rule in the Federal Register. A major rule cannot 
take effect until 60 days after it is published in the Federal 
Register. This action is not a ``major rule'' as defined by 5 U.S.C. 
804(2). This rule will be effective March 7, 2011.

L. Judicial Review

    Section 307(b)(1) of the CAA indicates which Federal Courts of 
Appeal have jurisdiction for petitions for review of final actions by 
EPA. This section provides, in part, that petitions for review must be 
filed in the Court of Appeals for the District of Columbia Circuit: (i) 
When the agency action consists of ``nationally applicable regulations 
promulgated, or final actions taken, by the Administrator,'' or (ii) 
when such action is locally or regionally applicable, if ``such action 
is based on a determination of nationwide scope or effect and if in 
taking such action the Administrator finds and publishes that such 
action is based on such a determination.'' EPA is determining that this 
action is of nationwide scope and effect.
    This rule designating areas for the 2006 24-hour PM2.5 
NAAQS is ``nationally applicable'' within the meaning of section 
307(b)(1). This rule establishes or corrects designations for several 
areas across the U.S. for the 2006 24-hour PM2.5 NAAQS. In 
addition, this action relates to the prior nationwide rulemaking in 
which EPA promulgated designations for numerous other areas nationwide. 
At the core of this rulemaking is EPA's interpretation of the 
definition of ``nonattainment'' under section 107(d)(1) of the CAA. In 
determining which areas should be designated ``nonattainment'' (or 
conversely, should be designated attainment or unclassifiable), EPA 
used an analytical approach that it applied consistently across the 
U.S. in this rulemaking, and in the prior related rulemaking.
    For the same reasons, the Administrator also is determining that 
the final designations are of nationwide scope and effect for the 
purposes of section 307(b)(1). This is particularly appropriate 
because, in the report on the 1977 Amendments that revised section 
307(b)(1) of the CAA, Congress noted that the Administrator's 
determination that an action is of ``nationwide scope or

[[Page 6063]]

effect'' would be appropriate for any action that has a scope or effect 
beyond a single judicial circuit. H.R. Rep. No. 95-294 at 323, 324, 
reprinted in 1977 U.S.C.C.A.N. 1402-03. Here, the scope and effect of 
this rulemaking extends to multiple judicial circuits because the 
designations apply to various areas of the country. Proceeding with 
litigation in multiple circuits would waste judicial, agency, and 
litigant resources, and could lead to inconsistent results. In these 
circumstances, section 307(b)(1) and its legislative history calls for 
the Administrator to find the rule to be of ``nationwide scope or 
effect'' and for venue to be in the DC Circuit.
    Thus, any petitions for review of final designations must be filed 
in the Court of Appeals for the District of Columbia Circuit within 60 
days from the date final action is published in the Federal Register.

List of Subjects in 40 CFR Part 81

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

    Dated: January 26, 2011.
Lisa P. Jackson,
Administrator.

    For the reasons set forth in the preamble, 40 CFR part 81 is 
amended as follows:

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

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

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

Subpart C--Section 107 Attainment Status Designations

0
2. In Sec.  81.303, the ``Arizona--PM2.5 (24-hour NAAQS)'' 
table is amended as follows:
0
a. By adding a new entry for ``West Central Pinal'' after ``Santa Cruz 
County'' under ``Nogales'' to read as set forth below.
0
b. By revising the entry for ``Cochise County'' to read as set forth 
below.
0
c. By revising the entry for ``Gila County'' to read as set forth 
below.
0
d. By revising the entry for ``Graham County'' to read as set forth 
below.
0
e. By revising the entry for ``La Paz County'' to read as set forth 
below.
0
f. By revising the entry for ``Maricopa County'' to read as set forth 
below.
0
g. By revising the entry for ``Pima County'' to read as set forth 
below.
0
h. By revising the entry for ``Pinal County'' to read as set forth 
below.
0
i. By revising the entry for ``Yavapai County'' to read as set forth 
below.
0
j. By revising the entry for ``Yuma County'' to read as set forth 
below.
0
k. By adding entries for ``Lands of the Gila River Indian Community in 
Pinal County'' and ``Lands of the Ak-Chin Indian Community'' after 
``Yuma County'' as set forth below.


Sec.  81.303  Arizona.

* * * * *

                                                                     Arizona--PM2.5
                                                                     [24-hour NAAQS]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                  Designation for the 1997 NAAQS \a\                        Designation for the 2006 NAAQS \a\
           Designated area            ------------------------------------------------------------------------------------------------------------------
                                        Date \1\                       Type                       Date \2\                      Type
--------------------------------------------------------------------------------------------------------------------------------------------------------
 
                                                                      * * * * * * *
West Central Pinal:
    Pinal County (part)..............  .........  Unclassifiable/Attainment....................     3/7/11  Nonattainment.
        1. Commencing at a point
         which is the intersection of
         the eastern line of Range 1
         East, Gila and Salt River
         Baseline and Meridian, and
         the northern line of
         Township 4 South, which is
         the point of beginning:
        2. Thence, proceed easterly
         along the northern line of
         Township 4 South to a point
         where the northern line of
         Township 4 South intersects
         the eastern line of Range 4
         East;
        3. Thence, southerly along
         the eastern line of Range 4
         East to a point where the
         eastern line of Range 4 East
         intersects the northern line
         of Township 6 South;
        4. Thence, easterly along the
         northern line of Township 6
         South to a point where the
         northern line of Township 6
         South intersects the eastern
         line of Range 4 East;
        5. Thence, southerly along
         the eastern line of Range 4
         East to a point where the
         eastern line of Range 4 East
         intersects the southern line
         of Township 7 South;
        6. Thence, westerly along the
         southern line of Township 7
         South to a point where the
         southern line of Township 7
         South intersects the quarter
         section line common to the
         southwestern southwest
         quarter section and the
         southeastern southwest
         quarter section of section
         34, Range 3 East and
         Township 7 South;

[[Page 6064]]

 
        7. Thence, northerly along
         the quarter section line
         common to the southwestern
         southwest quarter section
         and the southeastern
         southwest quarter section of
         sections 34, 27, 22, and 15,
         Range 3 East and Township 7
         South, to a point where the
         quarter section line common
         to the southwestern
         southwest quarter section
         and the southeastern
         southwest quarter section of
         sections 34, 27, 22, and 15,
         Range 3 East and Township 7
         South, intersects the
         northern line of section 15,
         Range 3 East and Township 7
         South;
        8. Thence, westerly along the
         northern line of sections
         15, 16, 17, and 18, Range 3
         East and Township 7 South,
         and the northern line of
         sections 13, 14, 15, 16, 17,
         and 18, Range 2 East and
         Township 7 South, to a point
         where the northern line of
         sections 15, 16, 17, and 18,
         Range 3 East and Township 7
         South, and the northern line
         of sections 13, 14, 15, 16,
         17, and 18, Range 2 East and
         Township 7 South, intersect
         the eastern line of Range 1
         East, which is the common
         boundary between Maricopa
         and Pinal Counties, as
         described in Arizona Revised
         Statutes sections 11-109 and
         11-113;
        9. Thence, northerly along
         the eastern line of Range 1
         East to the point of
         beginning which is the point
         where the eastern line of
         Range 1 East intersects the
         northern line of Township 4
         South;
        10. Except that portion of
         the area defined by
         paragraphs 1 through 9 above
         that lies in Indian country.
 
                                                                      * * * * * * *
Rest of State:
 
                                                                      * * * * * * *
    Cochise County...................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
    Gila County......................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
    Graham County....................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
    La Paz County....................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
    Maricopa County..................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
    Pima County......................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
    Pinal County (remainder,           .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
     excluding lands of the Gila
     River Indian Community and Ak-
     Chin Indian Community.
 
                                                                      * * * * * * *
    Yavapai County...................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
    Yuma County......................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
    Lands of the Gila River Indian     .........  Unclassifiable/Attainment....................  .........  Unclassifiable/Attainment.
     Community in Pinal County.

[[Page 6065]]

 
    Lands of the Ak-Chin Indian        .........  Unclassifiable/Attainment....................  .........  Unclassifiable/Attainment.
     Community in Pinal County.
--------------------------------------------------------------------------------------------------------------------------------------------------------

0
3. In Sec.  81.305, the ``California--PM2.5 (24-hour 
NAAQS)'' table is amended as follows:
0
a. By revising the entry for ``Trinity County'' under the heading of 
``North Coast Air Basin'' to read as set forth below.
0
b. By revising the entries for ``Lassen County,'' ``Modoc County,'' and 
``Siskiyou County'' under the heading of ``Northeast Plateau Air 
Basin'' to read as set forth below.
0
c. By revising the entries for ``Butte County (remainder)'', ``Shasta 
County'', ``Tehama County'', and ``Yuba County (remainder)'' under the 
heading ``Upper Sacramento Valley Region'' to read as set forth below.
0
d. By revising the entries for ``Plumas County,'' and ``Sierra County'' 
under the heading ``Northern Mountain Counties'' to read as set forth 
below.


Sec.  81.305  California.

* * * * *

                                                                    California--PM2.5
                                                                     [24-hour NAAQS]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                  Designation for the 1997 NAAQS \a\                        Designation for the 2006 NAAQS \a\
           Designated area            ------------------------------------------------------------------------------------------------------------------
                                        Date \1\                       Type                       Date \2\                      Type
--------------------------------------------------------------------------------------------------------------------------------------------------------
 
                                                                      * * * * * * *
Rest of State:
North Coast Air Basin:
 
                                                                      * * * * * * *
    Trinity County...................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
Northeast Plateau Air Basin:
    Lassen County....................  .........  Unclassifiable/Attainment....................     3/7/11   Unclassifiable/Attainment.
    Modoc County.....................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/ Attainment.
    Siskiyou County..................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
Upper Sacramento Valley Region:
    Butte County (remainder).........  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
    Shasta County....................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
    Tehama County....................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
    Yuba County (remainder)..........  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
Northern Mountain Counties:
 
                                                                      * * * * * * *
    Plumas County....................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/ Attainment.
    Sierra County....................  .........  Unclassifiable/Attainment....................     3/7/11  Unclassifiable/ Attainment.
 
                                                                      * * * * * * *
--------------------------------------------------------------------------------------------------------------------------------------------------------


0
4. In Sec.  81.327, the ``Montana--PM2.5 (24-hour NAAQS)'' 
table is amended as follows:
0
a. By removing the entry for ``Ravalli County''.
0
b. By removing the heading ``Rest of State:'' and adding in its place 
``Statewide'' as set forth below.
0
c. By adding a section for ``Ravalli County'' after ``Prairie County'' 
to read as set forth below.


Sec.  81.327  Montana.

* * * * *

[[Page 6066]]



                                                                     Montana--PM2.5
                                                                     [24-hour NAAQS]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                  Designation for the 1997 NAAQX \a\                        Designation for the 2006 NAAQS \a\
           Designated area            ------------------------------------------------------------------------------------------------------------------
                                         Date 1                        Type                        Date 2                       Type
--------------------------------------------------------------------------------------------------------------------------------------------------------
Statewide:
 
                                                                      * * * * * * *
    Ravalli County...................  .........  Unclassifiable/Attainment....................  .........  Unclassifiable/Attainment.
 
                                                                      * * * * * * *
--------------------------------------------------------------------------------------------------------------------------------------------------------

0
5. In Sec.  81.343, the ``Tennessee--PM2.5 (24-hour NAAQS)'' 
table is amended by removing the designated area ``Knoxville,TN'' and 
adding in its place ``Knoxville-Sevierville-La Follette, TN'' to read 
as follows:


Sec.  81.343  Tennessee.

* * * * *

                                                                    Tennessee--PM2.5
                                                                     [24-hour NAAQS]
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                  Designation for the 1997 NAAQS \a\                        Designation for the 2006 NAAQS \a\
           Designated area            ------------------------------------------------------------------------------------------------------------------
                                         Date 1                        Type                        Date 2                       Type
--------------------------------------------------------------------------------------------------------------------------------------------------------
Knoxville-Sevierville-La Follette, TN
 
                                                                      * * * * * * *
--------------------------------------------------------------------------------------------------------------------------------------------------------

[FR Doc. 2011-2269 Filed 2-2-11; 8:45 am]
BILLING CODE 6560-50-P