Clean Air Status and Trends Network (CASTNET) Quarterly Data Summary for Third Quarter 2022 (July through September)


Clean Air Status and Trends Network (CASTNET)

Quarterly Data Summary for Third Quarter 2022 (July through September)

Prepared for: U.S. Environmental Protection Agency (EPA), Clean Air Markets Division

EPA Contract No.: 68HERH21D0006, CASTNET Base Program (1003)

Prepared by: Wood Environment & Infrastructure Solutions, Inc. (Wood), Gainesville, Florida

Wood Project No.: 6064226103

Submitted: January 3, 2023

Introduction

This quarterly report summarizes the Clean Air Status and Trends Network (CASTNET) data
collected during third quarter 2022. Trends in pollutants measured at eastern and western
reference sites are shown. Results from the quality assurance/quality control (QA/QC) program are
presented for third quarter data and include completeness and precision of filter concentrations
and hourly 03 concentrations. This report also analyzes data for continuous, trace-level NOy from
the six of eight sites that were operational during third quarter and continuous S02 concentrations
from three sites. Other QC statistics are given in the CASTNET Third Quarter 2022 Quality
Assurance Report (Wood, 2022).

Figure 1. Fourth Highest Daily Maximum 8-hour Average 03 Concentrations (ppb) through Third
Quarter 2022

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 1 shows fourth highest daily maximum 8-hour average (DM8A) 03 concentrations measured
through third quarter 2022. Five sites exceeded the 0.070 parts per million National Ambient Air
Quality Standard for 03. Sites that did not meet data completeness are shown as dots with no
value. As of May 10, 2022, ozone sampling was discontinued at seven sites due to EPA's Fiscal
Year 2022 budget constraints.

Trends

Trend analyses were performed based on filter pack pollutant concentrations measured in
micrograms per cubic meter (jjg/m3) of air at the 34 eastern and 16 western reference sites during
third quarter. Trends in quarterly mean filter pack and 03 concentrations are shown using box plots
in Figures 2 through 13.

Third Quarter Concentrations

Quarterly mean HN03, NH+4, total N03, SO4, CI". Ca2+, K+, Mg2+, and Na+ concentrations decreased
at eastern sites in 2022 while N03, and S02 concentrations increased. All quarterly mean
concentrations decreased at western sites in 2022.

Quarterly 03 concentrations were analyzed using box plots constructed by averaging all valid
hourly 03 concentrations within third quarter 2022 by site and then averaging those averages for all
eastern and western reference sites (Figure 13). The figure shows an overall reduction in quarterly
mean 03 concentrations at eastern sites. Mean 03 concentrations at western sites show an overall
decrease and an increase in third quarter 2022. Quarterly mean concentrations were higher at the
western reference sites than at the eastern sites.

Figure 2. Trends in Third Quarter Mean HN03 Concentrations
Western Reference Sites

Eastern Reference Sites

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 3. Trends in Third Quarter Mean N03 Concentrations
Western Reference Sites

Eastern Reference Sites

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Figure 4. Trends in Third Quarter Mean NHl Concentrations
Western Reference Sites

Eastern Reference Sites

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Figure 5. Trends in Third Quarter Mean Total N03 Concentrations

Western Reference Sites

Eastern Reference Sites

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 6. Trends in Third Quarter Mean S02 Concentrations
Western Reference Sites

Eastern Reference Sites

90th Percentile

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Figure 7. Trends in Third Quarter Mean SOV Concentrations
Western Reference Sites

Eastern Reference Sites

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Mean
Median
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Figure 8. Trends in Third Quarter Mean CI" Concentrations
Western Reference Sites

Eastern Reference Sites

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 9. Trends in Third Quarter Mean Ca Concentrations
Western Reference Sites

Eastern Reference Sites

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Figure 10. Trends in Third Quarter Mean K+ Concentrations
Western Reference Sites

Eastern Reference Sites

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Figure 11. Trends in Third Quarter Mean Mg + Concentrations
Western Reference Sites

Eastern Reference Sites

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 12. Trends in Third Quarter Mean Na+ Concentrations
Western Reference Sites

Eastern Reference Sites

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Figure 13. Trends in Third Quarter Mean 03 Concentrations
Western Reference Sites

Eastern Reference Sites

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EPA Contract No. 68HERH21D0006	CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 14. Wildfire Acres Burned in 10 Western States (2010-2021)

9,000,000

8,000,000

^ 7,000,000



•5 2,000,000

¦| 1,500,000

3

z 1,000,000

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CASTNET Quarterly Data Summary - Third Quarter 2022

Changes in 3-year Average Third Quarter Concentrations

Three-year averages of quarterly mean concentrations of total N03, NH+4, S02, and S024 were
reduced over the period 1990-1992 through 2020-2022 for eastern reference sites and 1996-
1998 through 2020-2022 for western reference sites. Ozone concentrations decreased at eastern
sites and showed minimal reduction at western reference sites. Levels of Ca2+, Mg2+, and Na+
declined at eastern sites from 2004-2006 through 2020-2022 while CI" and K+ values increased.
At western sites, CI" and base cation concentrations increased.

Table 1. Eastern Reference Sites: 3-Year Mean 03, Nitrogen, Sulfur, Base Cations, and CI"
Pollutant Concentrations

Parameter

1990-1992
(|jg/m3)

2004-2006
(|jg/m3)

2020-2022
(|jg/m3)

Percent
Change

03 (ppb)

36



27

-25

Total NO"3

2.7

0.8

-70

nh;

2.2

0.4

-83

so2

5.7

0.3

-94

so*

8.1

1.1

-87

Ca2+



0.27

0.23

-14

K+

0.09

0.09

5

Mg2+

0.05

0.05

-11

Na+

0.08

0.07

-17

CI"

0.04

0.05

24

Note: Ozone concentrations are given as ppb. Concentrations for all other parameters are in |jg/m3.

Table 2. Western Reference Sites: 3-Year Mean 03, Nitrogen, Sulfur, Base Cations, and CI"
Pollutant Concentrations

Parameter

1996-1998
(|jg/m3)

2004-2006
(|jg/m3)

2020-2022
(|jg/m3)

Percent
Change

03 (ppb)

45



44

-1

Total NO"3

1.4

0.9

-32

nh;

0.4

0.3

-33

so2

0.6

0.3

-55

SO*

1.2

0.6

-46

Ca2+



0.19

0.29

58

K+

0.05

0.08

60

Mg2+

0.03

0.05

31

Na+

0.10

0.12

17

CI"

0.03

0.05

90

Note: Ozone concentrations are given as ppb. Concentrations for all other parameters are in |jg/m3.

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CASTNET Quarterly Data Summary - Third Quarter 2022

Time Series of Laboratory Analysis Parameters for All Sites

Figures 16 through 26 give time series of laboratory-analyzed concentrations of field samples and
field blanks in milligrams per liter (mg/L) of 11 parameters from September 2019 through third
quarter 2022. These figures provide indications of potential issues with concentration
measurements relative to detection and reporting limits.

Figure 16. Concentrations of N03 (as N) from Nylon Filters

• All Samples • Median ~ Field Blanks

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 18. Concentrations of Nhf4 (as N) from Teflon Filters

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{ (V K' ' if 
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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 20. Concentrations of S04 from Nylon Filters

All Samples • Median ~ Field Blanks

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Note: Nominal reporting limit is 0.040 mg/L.

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 22. Concentrations of CI" from Teflon Filters

^	A n''	nN qN ,A „N n'v nN qN n'V n'L ,,'l n*V fJV n'L n'V ,,'l JV n'V n't

VwWWWfW

Note: Nominal reporting limit is 0.020 mg/L.

Figure 23. Concentrations ofCa from Teflon Filters

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 C> ^ Qr 05 C2i Qi^ \ \p Q) QI'C55 O 
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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 24. Concentrations of K+ from Teflon Filters

^	A n''	nN ,A „N n'v ^ qN n'V n'L ,,'l n*V fJV n'L n'V ,,'l JV n'V n't

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Note: Nominal reporting limit is 0.006 mg/L.

Figure 25. Concentrations of Mg from Teflon Filters

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Note: Nominal reporting limit is 0.003 mg/L.

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 26. Concentrations of Na+ from Teflon Filters

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Note: Nominal reporting limit is 0.005 mg/L.

Time Series of Concentration Differences from Co-located Sites

Figures 27 and 28 show times series of concentration differences between the two sets of co-
located sites. Figure 27 shows a disparity in co-located concentrations at the MCK131/231 site
during the week of 8/23/22 (week 34). Project scientists are reviewing these data further. The
disparity in concentrations at ROM406/206 was caused by flow problems at ROM406.

Figure 27. Time Series of Filter Concentration Differences between MCK131 and MCK231, KY
0.4

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CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 28. Time Series of Filter Concentration Differences between ROM406 and ROM206, CO
0.3

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Precision of Filter Pack Concentrations

Table 3 shows mean absolute relative percent differences (MARPD) for concentrations
measured at MCK131/231 and ROM406/206 during third quarter 2022. The MARPD values at
MCK131/231 met the 20 percent criterion. The ROM406/206 values did not because of problems
with the ROM406 flow system.

Table 3. Precision (MARPD) for Co-located Filter Pack Data during Third Quarter 2022



Total











Ca2+

n <1 2+

Mg









N03

HNO3

N03

nh+4

so2

S024

Na+

K+

CI"

MCK131/231, KY

X(|ag/m3)

1.08

0.28

0.40

0.26

0.04

0.04

0.08

0.03

0.67

0.37

0.94

Y (^g/m3)

1.05

0.28

0.39

0.27

0.04

0.03

0.08

0.03

0.66

0.38

0.93

MAD

0.05

0.01

0.02

0.02

0.00

0.00

0.01

0.00

0.04

0.04

0.05

MARPD

4.39

4.30

3.88

6.21

6.25

11.17

7.62

1.14

6.04

13.56

4.74

ROM406/206, CO

X(|ag/m3)

0.39

0.15

0.18

0.13

0.02

0.02

0.03

0.02

0.41

0.17

0.56

Y (^g/m3)

0.52

0.21

0.23

0.17

0.02

0.03

0.04

0.02

0.59

0.19

0.79

MAD

0.12

0.06

0.05

0.05

0.01

0.01

0.01

0.00

0.18

0.05

0.23

MARPD

29.07

32.25

24.25

34.02

27.68

33.63

28.22

19.72

38.08

25.11

36.37

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CASTNET Quarterly Data Summary - Third Quarter 2022

Completeness for Filter Pack Concentrations

Table 4 shows CASTNET sites with less than 90 percent completeness for weekly filter pack concentrations. Comments are included to
provide information on why these sites experienced low data completeness.

Table 4. Sites with less than 90 Percent Data Completeness for Filter Concentrations for Third Quarter 2022 (1 of 2)









Teflon













Teflon

Teflon

Teflon

Minor

Teflon

Nylon

Nylon

Cellulose



Site ID

so*

no3

nh;

Cations

CI"

hno3

so*

so2

Comment

ALC188, TX

85

85

85

85

85

85

85

85

There were two 2-week samples during
the quarter.

ANA115, Ml

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

ASH135, ME

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

BBE401, TX

85

85

85

85

85

85

85

85

The site operator left the flow pump off for
one sample, and flow was missing or
invalid for an extended period during
another sampling week.

BEL116, MD

69

69

69

69

69

69

69

69

The mass flow controller malfunctioned
and affected three samples. It was
subsequently replaced. Another sample
was affected by a power failure.

BWR139, MD

77

77

77

77

77

77

77

77

There were three 2-week samples during
the quarter.

CDR119, WV

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

CDZ171, KY

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

DCP114, OH

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

EGB181, ON

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

FOR605, WY

77

77

77

77

77

77

77

77

Flow data were missing for three
samples.

HWF187, NY

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

LAV410, CA

85

85

85

85

85

85

85

85

The flow pump failed, affecting one
sample. A power failure affected another
sample.

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Table 4. Sites with less than 90 Percent Data Completeness for Filter Concentrations for Third Quarter 2022 (2 of 2)









Teflon













Teflon

Teflon

Teflon

Minor

Teflon

Nylon

Nylon

Cellulose



Site ID

so*

no3

nh;

Cations

CI"

hno3

so*

so2

Comment

PNF126, NC

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

PSU106, PA

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

SAN 189, NE

0

0

0

0

0

0

0

0

Tribal partner paused filter pack sampling
in second quarter until October 1, 2022.

SUM156, FL

69

69

69

69

69

69

69

69

Four samples were affected by a flow
system calibration failure.

UND002, VT

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

WST109, NH

0

0

0

0

0

0

0

0

Site was moth balled due to EPA's
FY2022 budget.

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Precision of Ozone Concentrations

Time series of co-located hourly 03 concentration differences for third quarter 2022 are provided in
Figures 29 and 30 for MCK131/231 and ROM406/206, respectively. The figures indicate no
consistent bias between the co-located analyzers at these site locations.

Figure 29. Time Series of the Differences in Co-located 03 Concentrations for MCK131/231, KY
4

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O Q- £-

^ s

CD

Q o

si o

ro O

£¦

CO

1-2

CL

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

OJ

T—

T—

T—

T—

o

o

o

CD

CD

CD



T—

OJ

CO

T—

OJ

CO

CD

T—

OJ









CO

CO

CO



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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Table 5 gives MARPD data for 03 data measured at the two co-located sites.

Table 5. Quarterly Precision (MARPD) for Co-located 03 Concentrations

Site Pair

Quarter

Start Date

MARPD

Records

MCK131/231, KY



4

10/1/21

1.0

2086



1

1/1/22

1.1

2046



2

4/1/22

0.6

2066



3

7/1/22

0.8

2058

ROM406/206, CO



4

10/1/21

1.7

2075



1

1/1/22

2.0

1970



2

4/1/22

1.5

1932



3

7/1/22

1.8

1638

Completeness for 03 Concentrations

Calculation of an annual 03 value requires 75 percent completeness. However, calculation of the
3-year design value used for regulatory purposes requires 90 percent completeness. Table 6
shows CASTNET sites with less than 90 percent completeness for DM8A 03 concentrations.
Comments are provided for these sites.

Table 6. Sites with less than 90 Percent Data Completeness for DM8A Concentrations during
Third Quarter 2022 (1 of 2)

Site ID

Percent
Completeness

Comments

ASH135, ME

0

Site was mothballed due to EPA's FY2022 budget.

HWF187, NY

0

Site was mothballed due to EPA's FY2022 budget.

WST109, NH

0

Site was mothballed due to EPA's FY2022 budget.

PNF126, NC

0

Site was mothballed due to EPA's FY2022 budget.

CDZ171, KY

0

Site was mothballed due to EPA's FY2022 budget.

DCP114, OH

0

Site was mothballed due to EPA's FY2022 budget.

CDR119, WV

0

Site was mothballed due to EPA's FY2022 budget.

OXF122, OH

75

Occasional high shelter temperatures resulted in invalid data during
August. The shelter air conditioning unit was replaced September 2.

ROM406, CO

76

Sample pump failures affected data mid-July and again in late July.

CVL151, MS

83

The site analyzer malfunctioned in late August and was replaced in
September.

VIN140, IN

86

Occasional high shelter temperatures resulted in invalid data during
July. The shelter air conditioning unit was replaced July 22.

DEN417, AK

86

Sample pump failures affected data from early to mid-September.

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Table 6. Sites with less than 90 Percent Data Completeness for DM8A Concentrations during
Third Quarter 2022 (2 of 2)

Site ID

Percent
Completeness

Comments

BBE401, TX

86

A combination of QC check failures and a power outage affected data
in late August. Data were affected in mid-September due to a data
logger malfunction.

BEL116, MD

88

Intermittent power failures in July and August caused some data loss.

CAV436, NM

88

Elevated shelter temperatures resulted in data invalidation
intermittently during the quarter.

ALC188, TX

88

The site analyzer malfunctioned and was replaced in September.

VOY413, MN

89

Power outage affected data from mid- to late September.

GAS153, GA

89

The site analyzer malfunctioned and was replaced in July.

Table 7 shows CASTNET sites with less than 90 percent completeness for hourly 03
concentrations. Comments are provided for these sites. The annual average for each of these sites
is included for reference.

Table 7. Sites with less than 90 Percent Data Completeness for 03 Concentrations

Site ID

Q3 2022

Q4 2021-
Q3 2022

Comments

ASH135, ME

0

56

Site was moth balled due to EPA's FY2022 budget.

CDR119, WV

0

56

Site was moth balled due to EPA's FY2022 budget.

CDZ171, KY

0

60

Site was moth balled due to EPA's FY2022 budget.

DCP114, OH

0

60

Site was moth balled due to EPA's FY2022 budget.

HWF187, NY

0

59

Site was moth balled due to EPA's FY2022 budget.

PNF126, NC

0

60

Site was moth balled due to EPA's FY2022 budget.

WST109, NH

0

60

Site was moth balled due to EPA's FY2022 budget.

ROM406, CO

78

92

Sample pump failures affected data mid-July and again in
late July.

OXF122, OH

80

93

Occasional high shelter temperatures resulted in invalid data
during August. The shelter air conditioning unit was replaced
September 2.

DEN417, AK

86

96

Sample pump failures affected data from early to mid-
September.

ALC188, TX

88

96

The site analyzer malfunctioned and was replaced in
September.

CVL151, MS

89

95

The analyzer malfunctioned in late August and was replaced in
September.

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Filter Pack Total Nitrate and Continuous Trace-level NOy Concentrations at CASTNET Sites

Figures 31 through 38 show a comparison of weekly average continuous NOy measurements with
weekly filter pack total N03 concentrations collected at the six of eight sites with NOy
measurements. No data are available from HWF187 and PNF126 for third quarter 2022. The sites
were mothballed due to EPA's Fiscal Year 2022 budget constraints. The NOy concentrations were
consistently higher than the total N03 levels at all sites. The average weekly NOy levels, the weekly
total N03 concentrations, and their ratios for the six sites with available data are shown in Table 8.
Ratios of NOy to total N03 varied from 4.58 at GRS420 to 5.77 at DUK008.

Table 8. Summary of Total N03 and NOy Measurements for Third Quarter 2022

Site ID

Elevation

Total NO~3 (ppb)

NOy (ppb)

Ratio

DUK008, NC

164*

0.35

1.97

5.77

BVL130, IL

213

0.70

4.66

5.19

MAC426, KY

243

0.35

1.82

5.26

HWF187, NY*

497

-

-

-

GRS420, TN

793

0.27

1.21

4.58

PNF126, NC*

1216

-

-

-

PND165, WY

2386

0.21

1.16

5.73

ROM206, CO

2742

0.24

1.23

5.26

Note: * The inlet of the enhanced NOy monitor is located at the top of the 30-meter tower.

* The site was mothballed in second quarter 2022 due to EPA's FY2022 budget. No measurements were recorded
during third quarter 2022.

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

¦	Mean Continuous NOy

¦	Filter Pack Total Nitrate

Figure 31. Comparison of DUK008 Weekly Mean NOy and Total N03 Concentrations

Figure 32. Comparison of BVL130 Weekly Mean NOy and Total NO"3 Concentrations

3.0

—«— Mean Continuous NOy
—Filter Pack Total Nitrate

Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064226103

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 33. Comparison of MAC426 Weekly Mean NOy and Total NO"3 Concentrations

—«— Mean Continuous NOy
—Filter Pack Total Nitrate

34. Comparison of HWF187 Weekly Mean NOy and Total NO"3 Concentrations

0.8

¦	Mean Continuous NOy

¦	F i Ite r Pac k Tota I N itrate

0.6

0.4

TO

Site mothballed due to EPA's FY2022 budget.

0.2 8

c

o
O
o
ro

0.0 £

-0.2

-0.4

CO

CO

00

o5

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 35. Comparison of GRS420 Weekly Mean NOy and Total NO"3 Concentrations

_m- Mean Continuous NOy
—Filter Pack Total Nitrate

Figure 36. Comparison of PNF126 Weekly Mean NOy and Total NO"3 Concentrations

1.5

. Mean Continuous NOy
. Filter PackTotal Nitrate

1.2

1.0

1.0

O.i

Site mothballed due to EPA's FY2022 budget.

0.6

0.5

0.4 £

0.2

0.0

0.0



CO



Si

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Filter Pack and Continuous Trace-level Gas Sulfur Dioxide Concentrations

Figures 39 through 41 provide diagrams that compare weekly filter pack S02 concentrations with
continuous trace-level gas data measured at BVL130, MAC426, and GRS420. The continuously
measured trace-level concentrations were higher than filter pack concentrations at BVL130 and
were comparable at MAC426. The S02 concentrations measured at GRS420 were comparable
except for one week when the analyzer was not operating and during three weeks when the
instrument was sampling incorrectly.

Figure

2.0

1.5

£"

Q.

a

c

0

1	1.0

c

0.5

0.0

Figure 40. Comparison of MAC426 Weekly Mean S02 Concentrations

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CNCNCNCNCNCNCNCNCNCNCNCNCN

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Figure 41. Comparison of GRS420 Weekly Mean S02 Concentrations

Completeness for Continuous Trace-level Gas Measurements

Table 9 shows the percent completeness for CASTNET trace-level gas measurements. Comments
are provided for sites with less than 90 percent completeness for hourly trace-level gas
concentrations during third quarter 2022. The average for fourth quarter 2021 through third quarter
2022 for each of the sites is included for reference. Shading indicates sites with percent
completeness less than 90 percent.

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Table 9. Percent Data Completeness for Continuous Trace-level Gas Measurements (1 of 2)

Site ID

Parameter*

Q3 2022

Q4 2021-
Q3 2022

Comments for Third Quarter Results

BVL130, IL

CO

53

46

There were QC check failures in July and
August due to a loose Ethernet cable.

NO

90

89



NOY

90

93

NOYDIF

90

89

S02_GA

88

90

The site operator left the channel down.

CHC432, NM

NO

97

97



NOX

97

97

NOXDIF

97

97

DUK008, NC

HN03

89



~	Monitoring restarted August 2021, but QC
activities were not fully operational until
December 2021. As a result, the average
for Q4 2021 through Q3 2022 was not
calculated.

~	The QC check runs for NH3 result in three
to six hours of invalid data every two days
for all parameters.

~	Data for all parameters were invalidated for
8/27/22 to 8/30/22 due to calibration
activities.

~	Additionally, NH3 and TNX had lower
completeness due to a system leak in the
TNX channel.

NH3

43



NO

89



N02_TRUE

89



NOX_TRUE

89



NOY

89



NOYJVIINUS

89



NOYDIF

89



TNX

53



GRS420, TN

CO

78

82

Sample pump failure affected data from early
to mid-September

NO

91

87



NOY

91

87

NOYDIF

91

87

S02_GA

87

85

Sample pump failure affected data in late
July.

HWF187, NY

NO

0

56

Site was mothballed due to FY2022 budget.

NOY

0

55

NOYDIF

0

55

MAC426, KY

CO

95

95



NO

98

97



NOY

98

97

NOYDIF

98

97

S02_GA

98

97



PND165, WY

NO

91

85



NOY

91

84

NOYDIF

91

84

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EPA Contract No. 68HERH21D0006

CASTNET Quarterly Data Summary - Third Quarter 2022

Table 9. Percent Data Completeness for Continuous Trace-level Gas Measurements (2 of 2)

Site ID

Parameter*

Q3 2022

Q4 2021-
Q3 2022

Comments for Third Quarter Results

PNF126, NC

NO

0

55

Site was mothballed due to FY2022 budget.

NOY

0

55

NOYDIF

0

55

ROM206, CO

NO

95

95



NOY

95

95

NOYDIF

95

95

Note: * See Table 10

The parameters listed in Table 9 are both calculated and measured. Table 10 provides information
on how the parameters listed in Table 9 are obtained.

Table 10. CASTNET Trace-level Gas Measurements

Parameter Name

How Obtained

Description of Process

CO

Measured

Gas filter correlation

HN03

Calculated

NOY minus NOY_MINUS

NH3

Calculated

TNX minus NOY

NO

Measured

Chemiluminescence reaction/no converter used

N02_TRUE

Calculated

NOX_TRUE minus NO

NOX_TRUE

Measured

Photolytic converter

NOY

Measured

Molybdenum converter at 315° Celsius

NOYDIF

Calculated

NOY minus NO

NOY_MINUS

Measured

Sodium carbonate denuder followed by molybdenum converter at
315° Celsius

NOX

Measured

Molybdenum converter at 325° Celsius

NOXDIF

Calculated

NOX minus NO

S02_GA

Measured

Ultraviolet fluorescence

TNX

Measured

Platinum/stainless steel converter at 825° Celsius followed by
molybdenum converter at 315° Celsius

References

Wood Environment & Infrastructure Solutions, Inc. 2022. Clean Air Status and Trends Network
(CASTNET) Third Quarter 2022 Quality Assurance Report.
https://java.epa.gov/castnet/documents.do

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