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Federal Register / Vol. 86, No. 40 / Wednesday, March 3, 2021 / Rules and Regulations FR Doc. 202103124 Filed 3221; 8:45 am BILLING CODE 656050P

ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Parts 52
EPAR09OAR20200534; FRL10020
36Region 9

Approval and Promulgation of Air Quality State Implementation Plans;
California; Plumas County; Moderate Area Plan for the 2012 PM2.5 NAAQS
Environmental Protection Agency EPA.
ACTION: Final rule.
AGENCY:

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Table of Contents
The Environmental Protection Agency EPA is taking final action to approve a state implementation plan SIP revision submitted by the State of California to address Clean Air Act CAA or Act requirements for the 2012 annual fine particulate matter PM2.5 national ambient air quality standard NAAQS or standard in the Plumas County Moderate PM2.5
nonattainment area Portola nonattainment area. The submitted SIP revision is the States Proposed Portola PM2.5 Plan Contingency Measure SIP Submittal PM2.5 Plan Revision, which includes a revised City of Portola ordinance regulating PM2.5 emission sources and the States demonstration that this submission meets the Moderate area contingency measure requirement for the 2012 annual PM2.5 NAAQS in the Portola nonattainment area. The EPA is also taking final action to approve the contingency measure element of the Moderate area attainment plan for the Portola nonattainment area, as revised and supplemented by the PM2.5 Plan Revision.
DATES: This rule is effective on April 2, 2021.
ADDRESSES: The EPA has established a docket for this action under Docket ID
No. EPAR09OAR20200534. All documents in the docket are listed on the https www.regulations.gov website. Although listed in the index, some information is not publicly available, e.g., 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 through https
www.regulations.gov, or please contact the person identified in the FOR FURTHER
INFORMATION CONTACT section for SUMMARY:

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additional availability information. If you need assistance in a language other than English or if you are a person with disabilities who needs a reasonable accommodation at no cost to you, please contact the person identified in the FOR
FURTHER INFORMATION CONTACT section.
FOR FURTHER INFORMATION CONTACT: John Ungvarsky, Air Planning Office AIR2, EPA Region IX, 75 Hawthorne Street, San Francisco, CA 94105, 415 972
3963 or ungvarsky.john@epa.gov.
SUPPLEMENTARY INFORMATION:
Throughout this document, we, us, and our refer to the EPA.
I. Background II. Public Comments and EPA Responses III. Final Action IV. Incorporation by Reference V. Statutory and Executive Order Reviews
I. Background On January 15, 2013, the EPA
strengthened the primary annual NAAQS for particulate matter with a diameter of 2.5 microns or less by lowering the level from 15.0 micrograms per cubic meter mg/m3 to 12.0 mg/m3
2012 PM2.5 NAAQS.1 The EPA
established this standard after considering substantial evidence from numerous health studies demonstrating that serious health effects are associated with exposures to PM2.5 concentrations above these levels.
Epidemiological studies have shown statistically significant correlations between elevated levels of PM2.5
particulate matter with a diameter of 2.5 microns or less and premature mortality. Other important health effects associated with PM2.5 exposure include aggravation of respiratory and cardiovascular disease, changes in lung function, and increased respiratory symptoms. Individuals particularly sensitive to PM2.5 exposure include older adults, people with heart and lung disease, and children.2 PM2.5 can be emitted directly into the atmosphere as a solid or liquid particle primary PM2.5 or direct PM2.5 or can be formed in the atmosphere as a result of various chemical reactions among precursor pollutants such as nitrogen oxides, sulfur oxides, volatile organic compounds, and ammonia secondary PM2.5.3
1 78 FR 3086 and 40 CFR 50.18. Unless otherwise noted, all references to the PM2.5 NAAQS in this notice are to the 2012 annual NAAQS of 12.0 mg/
m3 codified at 40 CFR 50.18.
2 78 FR 3086, 3088 January 15, 2013.
3 EPA, Air Quality Criteria for Particulate Matter, No. EPA/600/P99/002aF and EPA/600/P99/
002bF, October 2004.

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Following promulgation of a new or revised NAAQS, the EPA is required by CAA section 107d to designate areas throughout the nation as attaining or not attaining the NAAQS. The EPA
designated and classified the Portola nonattainment area as Moderate nonattainment for the 2012 annual PM2.5 standards based on ambient monitoring data that showed the area was above 12.0 mg/m3 for the 20112013
monitoring period.4 For the 20112013
period, the annual PM2.5 design value for the Portola nonattainment area was 12.8 mg/m3 based on monitored readings at the 161 Nevada Street and 420
Gulling Street monitors.5
The Portola nonattainment area includes the City of Portola Portola, which has a population of approximately 2,100 and is located at an elevation of 4,890 feet in an intermountain basin isolated by rugged mountains. For a precise description of the geographic boundaries of the Portola nonattainment area, see 40 CFR 81.305.
The local air district with primary responsibility for developing a plan to attain the 2012 annual PM2.5 NAAQS in this area is the Northern Sierra Air Quality Management District NSAQMD
or District. The District worked with the California Air Resources Board CARB in preparing the PM2.5 Plan Revision. Under state law, authority for regulating sources under state jurisdiction in the Portola nonattainment area is split between the District, which has responsibility for regulating stationary and most area sources, and CARB, which has responsibility for regulating most mobile sources.
On February 28, 2017, California submitted the Portola Fine Particulate Matter PM2.5 Attainment Plan Portola PM2.5 Plan to address the CAAs Moderate area requirements for the 2012 annual PM2.5 NAAQS in the Portola nonattainment area. On March 25, 2019, the EPA fully approved the Portola PM2.5 Plan, except for the contingency measure element.6 As part of the attainment control strategy, the Portola PM2.5 Plan relies on Ordinance No. 344: An Ordinance of the City of Portola, County of Plumas Amending Chapter 15.10 of the City of Portola Municipal Code Providing for Regulation of Wood Stoves and Fireplaces City Ordinance No. 344
to achieve direct PM2.5 emission reductions necessary for attainment by 4 80

FR 2206 January 15, 2015.
2000 through early 2013, the Portola PM2.5
monitoring site was located at 161 Nevada Street.
In 2013, the site was relocated to 420 Gulling Street.
6 84 FR 11208.
5 From
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