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Federal Register / Vol. 86, No. 169 / Friday, September 3, 2021 / Proposed Rules 12.0 mg/m3. Three years of valid, annual means are required to produce a valid annual PM2.5 NAAQS design value. A
year of data meets data completeness requirements when quarterly data capture rates for all four quarters are at least 75 percent from eligible monitoring sites.10 By a letter to EPA
dated March 08, 2021, Allegheny County Health Department ACHD
certified its 2020 ambient air quality
again violating the 2012 annual PM2.5
NAAQS.
II. Clean Data Determination for the Allegheny County, Pennsylvania 2012
PM2.5 NAAQS Nonattainment Area Under EPA regulations at 40 CFR
50.18 and part 50, appendix N, the 2012
annual PM2.5 NAAQS is met when the 3-year average of PM2.5 annual mean mass concentrations for each eligible monitoring site is less than or equal to
monitoring data. EPA issued final 2018
2020 design values on May 24, 2021.11
There are nine PM2.5 eligible Federal Reference Method FRM or Federal Equivalent Method FEM monitoring sites in the Allegheny County nonattainment area. Table 1 in this document shows the Allegheny County Area design values for the 2012 annual PM2.5 NAAQS for the years 20182020
at all area monitoring sites.

TABLE 120182020 ANNUAL PM2.5 VALUES FOR THE ALLEGHENY COUNTY, PENNSYLVANIA AREA
Monitor name
Weighted mean g/m3

Monitor ID

2018
Avalon
Lawrenceville
South Fayette
North Park
Harrison
North Braddock
Clairton
Liberty
Parkway East

420030002
420030008
420030067
420030093
420031008
420031301
420033007
420030064
420031376

9.61
8.97
8.12
7.2
9.25
10.17
8.80
11.52
10.25

2019
9.89
8.97
7.65
6.81
8.64
9.85
7.87
12.16
10.79

Complete quarters
2020

2018

8.57
7.66
6.56
5.74
7.32
9.03
7.34
9.76
8.97

2019
4 4
4 3
4 4
4 4
4

Certified annual design value 20182020
g/m3

2020
4 4
4 4
4 4
4 4
4

4
4 4
3 4
4 4
4 4

9.4
8.5
7.4
6.6
8.4
9.7
8.0
11.1
10.0

North Park has incomplete data sets for 2018 and 2020.

TABLE 2DATA CAPTURE RATES % AND CREDITABLE SAMPLES BY QUARTER Q FOR THE NORTH PARK MONITOR
420030093
2018
Q1

lotter on DSK11XQN23PROD with PROPOSALS1

Creditable Samples
Capture Rate

15
100

As shown in Table 1 in this document, for monitors in the Allegheny County area, all but the North Park monitoring location have complete 20182020 reporting data capture rates of at least 75%. At the North Park monitoring site, the fourth quarter in 2018 and the fourth quarter in 2020 for the North Park monitor Monitor ID
420030093 had a data capture rate of 33% and 13%, respectively. The North Park monitor data was incomplete in fourth quarter 2018 because of a roof replacement taking place at the monitor location and North Park was approved for shut down in the third quarter of 2020 in ACHDs Annual Monitoring Plan for Calendar Year 2021.
Consistent with the requirements contained in 40 CFR part 58, EPA has reviewed the PM2.5 ambient air quality monitoring data for the monitoring period from 2018 through 2020 for the Allegheny County nonattainment area, as recorded in the AQS database, and
10 See
40 CFR part 50, appendix N.

VerDate Sep<11>2014

16:19 Sep 02, 2021

Q2
15
100

2019
Q3

Q4

16
100

5
33

Q1

Q2

14
93

15
100

has determined the data meet the quality assurance requirements set forth in 40 CFR part 58. In this respect, the data has been deemed usable by EPA for regulatory compliance purposes. As shown in Table 1 in this document, each quarter from 2018 through 2020 is complete, with all four quarters reporting data capture rates of at least 75
percent with the exception of the North Park monitor, as noted above. The highest certified annual design value for 20182020 is 11.1 mg/m3, with all nine ambient monitors below the 2012
annual PM2.5 NAAQS of 12.0 mg/m3.
Therefore, the Allegheny County nonattainment area has attained the 2012 annual PM2.5 NAAQS in accordance with the requirements in 40
CFR 50.18 and appendix N.
III. Proposed Action Pursuant to the PM2.5 Clean Data Policy codified at 40 CFR 51.1015, EPA
proposes to determine that based on
2020
Q3
15
94

Q4
14
93

PO 00000

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15
100

Q2
14
93

Q3
15
94

Q4
2 13

three years of certified, valid monitoring data between 2018 and 2020, the Allegheny County nonattainment area has attained the 2012 annual PM2.5
NAAQS. Pursuant to 40 CFR 51.1015a, and based upon our proposed clean data determination that the Allegheny County Area has attained the NAAQS, EPA proposes to determine that the CAA requirements to submit attainment-related SIP revisions arising from classification of the Area as Moderate nonattainment under subpart 4 of part D, of title I of the Act for the 2012 annual PM2.5 NAAQS are not applicable for so long as the area continues to attain the 2012 annual PM2.5 NAAQS. In particular, if EPA
finalizes this determination, it will suspend the requirements for the area to submit an attainment demonstration, RACM and RACT, RFP plan, quantitative milestones, contingency measures, and any other SIP
requirements related to the attainment
11 See EPAs Air Quality Design Values web page, at https www.epa.gov/air-trends/air-qualitydesign-values.

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