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Federal Register / Vol. 86, No. 229 / Thursday, December 2, 2021 / Rules and Regulations 2 Infrastructure Requirements for the 2015 8-Hour Ozone NAAQS at the end of the table to read as follows:

Subpart PPSouth Carolina 5. In 52.2120e, amend the table by adding a new entry for 110a1 and

State effective date
Provision

110a1 and 2 Infrastructure Requirements for the 2015 8-Hour Ozone NAAQS.

9/7/2018

FR Doc. 202126144 Filed 12121; 8:45 am BILLING CODE 656050P

ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
EPAR04OAR20200428; FRL891102
R4

Air Plan Approval; TN; Montgomery County Limited Maintenance Plan for the 1997 8-Hour Ozone NAAQS
Environmental Protection Agency EPA.
ACTION: Final rule.
AGENCY:

The Environmental Protection Agency EPA is taking final action to approve a state implementation plan SIP revision submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation TDEC, Air Pollution Control Division, on June 23, 2020. The SIP revision includes the 1997 8-hour ozone national ambient air quality standards NAAQS Limited Maintenance Plan LMP for the Montgomery County, Tennessee portion of the Clarksville-Hopkinsville Area hereinafter referred to as the Montgomery County Area or Area.
The Clarksville-Hopkinsville Area is comprised of Montgomery County, Tennessee, and Christian County, Kentucky. EPA is approving Tennessees LMP for the Montgomery County Area because it provides for the maintenance of the 1997 8-hour ozone NAAQS within the Montgomery County Area through the end of the second 10year portion of the maintenance period.
The effect of this action would be to make certain commitments related to maintenance of the 1997 8-hour ozone NAAQS in the Montgomery County Area federally enforceable as part of the Tennessee SIP.
DATES: This rule is effective January 3, 2022.
ADDRESSES: EPA has established a docket for this action under Docket ID
No. EPAR04OAR20200428. All
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SUMMARY:

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Identification of plan.

e

EPA approval date
I. Background In 1979, under section 109 of the Clean Air Act CAA or Act, EPA
established primary and secondary NAAQS for ozone at 0.12 parts per million ppm, averaged over a 1-hour period. See 44 FR 8202 February 8, 1979. On July 18, 1997, EPA revised the primary and secondary NAAQS for ozone to set the acceptable level of ozone in the ambient air at 0.08 ppm, averaged over an 8-hour period. See 62
FR 38856 July 18, 1997.1 EPA set the 1 In March 2008, EPA completed another review of the primary and secondary ozone NAAQS and tightened them further by lowering the level for
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Explanation

12/2/2021, Insert citation of publication

documents in the docket are listed on the www.regulations.gov website.
Although listed in the index, some information is not publicly available, i.e., Confidential Business Information 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 can either be retrieved electronically via www.regulations.gov or in hard copy at the Air Regulatory Management Section, Air Planning and Implementation Branch, Air and Radiation Division, U.S. Environmental Protection Agency, Region 4, 61 Forsyth Street SW, Atlanta, Georgia 303038960.
EPA requests that if at all possible, you contact the person listed in the FOR
FURTHER INFORMATION CONTACT section to schedule your inspection. The Regional Offices official hours of business are Monday through Friday 8:30 a.m. to 4:30 p.m., excluding Federal holidays.
FOR FURTHER INFORMATION CONTACT:
Sarah LaRocca, Air Regulatory Management Section, Air Planning and Implementation Branch, Air and Radiation Division, U.S. Environmental Protection Agency, Region 4, 61 Forsyth Street SW, Atlanta, Georgia 303038960.
The telephone number is 404 562
8994. Ms. LaRocca can also be reached via electronic mail at larocca.sara@
epa.gov.
SUPPLEMENTARY INFORMATION:

PO 00000

52.2120

Addressing Prongs 1
110a2DiI only.

and
2

of
section
8-hour ozone NAAQS based on scientific evidence demonstrating that ozone causes adverse health effects at lower concentrations and over longer periods of time than was understood when the pre-existing 1-hour ozone NAAQS was set. EPA determined that the 8-hour ozone NAAQS would be more protective of human health, especially children and adults who are active outdoors, and individuals with a pre-existing respiratory disease, such as asthma.
Following promulgation of a new or revised NAAQS, EPA is required by the CAA to designate areas throughout the nation as attaining or not attaining the NAAQS. On April 15, 2004, EPA
designated the Clarksville-Hopkinsville Area, which included Montgomery County, Tennessee, and Christian County, Kentucky, as nonattainment for the 1997 8-hour ozone NAAQS, and the designation became effective on June 15, 2004. See 69 FR 23858 April 30, 2004.
Similarly, on May 21, 2012, EPA
designated areas as unclassifiable/
attainment or nonattainment for the 2008 8-hour ozone NAAQS. EPA
designated Montgomery County as unclassifiable/attainment for the 2008 8hour ozone NAAQS. This designation became effective on July 20, 2012. See 77 FR 30088 May 21, 2012. In addition, on November 16, 2017, areas were designated for the 2015 8-hour ozone NAAQS. The Montgomery County Area was designated attainment/
unclassifiable for the 2015 8-hour ozone NAAQS, with an effective date of January 16, 2018. See 82 FR 54232
November 16, 2017.
A state may submit a request to redesignate a nonattainment area that is attaining a NAAQS to attainment, and, if the area has met other required criteria described in section 107d3E
of the CAA, EPA may approve the both to 0.075 ppm. See 73 FR 16436 March 27, 2008. Additionally, in October 2015, EPA
completed a review of the primary and secondary ozone NAAQS and tightened them by lowering the level for both to 0.070 ppm. See 80 FR 65292
October 26, 2015.

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