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Federal Register / Vol. 86, No. 25 / Tuesday, February 9, 2021 / Proposed Rules
A. Attainment Emissions Inventory For maintenance plans, a state should develop a comprehensive and accurate inventory of actual emissions for an attainment year which identifies the level of emissions in the area which is sufficient to maintain the NAAQS. The inventory should be developed consistent with EPAs most recent guidance. For ozone, the inventory should be based on typical summer days emissions of nitrogen oxides NOX and volatile organic compounds VOC, the precursors to ozone formation. In the first maintenance plan for the Erie Area, PADEP used 2004 for the attainment year inventory, because 2004 was one of the years in the 2004
2006 three-year period when the area first attained the 1997 ozone NAAQS.8
The Erie Area continued to monitor attainment of the 1997 ozone NAAQS in 2014. Therefore, the emissions inventory from 2014 represents emissions levels conducive to continued attainment i.e., maintenance of the NAAQS. Thus, PADEP is using 2014 as representing attainment level emissions for its second maintenance plan.
Pennsylvania used 2014 summer day emissions from EPAs 2014 version 7.0
modeling platform as the basis for the 2014 inventory presented in Table 1.9

addresses four anthropogenic emission source categories: Stationary point sources, stationary nonpoint area sources, nonroad mobile, and onroad mobile sources. Point sources are stationary sources that have the potential to emit more than 100 tons per year tpy of VOC, or more than 50 tpy of NOX, and which are required to obtain an operating permit. Data are collected for each source at a facility and reported to PADEP. Examples of point sources include kraft mills, electrical generating units, and pharmaceutical factories. Nonpoint sources include emissions from equipment, operations, and activities that are numerous and in total have significant emissions. Examples include emissions from commercial and consumer products, portable fuel containers, home heating, repair and refinishing operations, and crematories.
The onroad emissions sector includes emissions from engines used primarily to propel equipment on highways and other roads, including passenger vehicles, motorcycles, and heavy-duty diesel trucks. The nonroad emissions sector includes emissions from engines that are not primarily used to propel transportation equipment, such as generators, forklifts, and marine pleasure craft. EPA reviewed the TABLE 12014 TYPICAL SUMMER DAY emissions inventory submitted by NOX AND VOC EMISSIONS FOR THE PADEP and proposes to conclude that the plans inventory is acceptable for the ERIE AREA IN TONS/DAY
purposes of a subsequent maintenance plan under CAA section 175Ab.
Source NOX
VOC
category
emissions
Point
Nonpoint
Onroad
Nonroad

emissions
1.43
6.50
10.37
4.48

1.37
14.13
4.52
5.43

The data shown in Table 1 is based on the 2014 National Emissions Inventory NEI version 2.10 The inventory
B. Maintenance Demonstration In order to attain the 1997 ozone NAAQS, the three-year average of the fourth-highest daily average ozone concentrations design value, or DV
at each monitor within an area must not exceed 0.08 ppm. Based on the rounding convention described in 40

CFR part 50, appendix I, the standard is attained if the DV is 0.084 ppm or below. CAA section 175A requires a demonstration that the area will continue to maintain the NAAQS
throughout the duration of the requisite maintenance period. Consistent with the prior guidance documents discussed previously in this document as well as EPAs November 20, 2018 Resource Document for 1997 Ozone NAAQS
Areas: Supporting Information for States Developing Maintenance Plans 2018
Resource Document,11 EPA believes that if the most recent DV for the area is well below the NAAQS e.g., below 85%, or in this case below 0.071 ppm, the section 175A demonstration requirement has been met, provided that prevention of significant deterioration requirements, any control measures already in the SIP, and any Federal measures remain in place through the end of the second 10-year maintenance period absent a showing consistent with section 110l that such measures are not necessary to assure maintenance.
There is one ambient air quality monitor in the Erie Area. For the purposes of demonstrating continued maintenance with the 1997 ozone NAAQS, PADEP provided 3-year DVs at the monitor located in the Erie Area from 2007 to 2018. This includes DVs for 20052007, 20062008, 20072009, 20082010, 20092011, 20102012, 20112013, 20122014, 20132015, 20142016, 20152017, and 20162018, which are shown in Table 2.12 In addition, EPA has reviewed the most recent ambient air quality monitoring data for ozone in the Erie Area, as submitted by Pennsylvania and recorded in EPAs Air Quality System.
The most recent DV i.e., 20172019 at the monitor located in the Erie Area is also shown in Table 2.13

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TABLE 21997 OZONE NAAQS DESIGN VALUES IN PARTS PER MILLION FOR THE ERIE AREA
County
AQS Site ID

Erie

420490003

2005
2007

2006
2008

2007
2009

2008
2010

2009
2011

2010
2012

2011
2013

2012
2014

2013
2015

2014
2016

2015
2017

2016
2018

2017
2019

.082

.078

.075

.072

.072

.076

.074

.071

.066

.066

.065

.064

0.062

As can be seen in Table 2, DVs at the monitor located in the Erie Area have
been below 85% of the 1997 ozone NAAQS i.e., 0.071 ppm since the
20132015 period. The DV for the 2017
2019 period at the monitor in the Erie
8 For more information, see EPAs October 9, 2007
document proposing to redesignate the Erie Area to attainment for the 1997 ozone NAAQS 72 FR
57207.
9 For more information, visit https
www.epa.gov/sites/production/files/2018-11/ozone_
1997_naaqs_emiss_inv_data_nov_19_2018_0.xlsx.
10 The NEI is a comprehensive and detailed estimate of air emissions of criteria pollutants, criteria precursors, and hazardous air pollutants from air emissions sources. The NEI is released
every three years based primarily upon data provided by State, Local, and Tribal air agencies for sources in their jurisdictions and supplemented by data developed by EPA.
11 This resource document is included in the docket for this rulemaking available online at https www.regulations.gov, Docket ID: EPAR03
OAR20200553 and is also available at https
www.epa.gov/sites/production/files/2018-11/
documents/ozone_1997_naaqs_lmp_resource_
document_nov_20_2018.pdf.

12 See also Table II2 of PADEPs February 27, 2020 submittal, included in the docket for this rulemaking available online at https
www.regulations.gov, Docket ID: EPAR03OAR
20200553.
13 This data is also included in the docket for this rulemaking available online at https
www.regulations.gov, Docket ID: EPAR03OAR
20200553 and is also available at https
www.epa.gov/air-trends/air-quality-designvaluesreport.

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