APPENDIX F 

2018 Visibility Projections at VISTAS and Nearby Class I Areas for the 

Best 20 Percent Days using EPA Default Approach 
 F-1 

2018 VISIBILITY PROJECTS AT VISTAS AND NEARBY CLASS I AREAS 

FOR THE BEST 20 PERCENT DAYS USING EPA DEFAULT APPROACH 

VISTAS Class I Areas

• Figure F-1: Sipsey Wilderness Area (SIPS), Alabama 

• Figure F-2: Chassahowitzka Wildlife Refuge (CHAS), Florida 

• Figure F-3: Everglades National Park (EVER), Florida 

• Figure F-4: St. Marks Wildlife Refuge (SAMA), Florida 

• Figure F-5: Cohutta Wilderness Area (COHU), Georgia 

• Figure F-6: Okefenokee Wildlife Refuge (OKEF), Georgia 

• Figure F-7: Mammoth Cave National Park (MACA), Kentucky 

• Figure F-8: Linville Gorge Wilderness Area (LIGO), North Carolina 

• Figure F-9: Shining Rock Wilderness Area (SHRO), North Carolina 

• Figure F-10: Swanquarter Wildlife Refuge (SWAN), North Carolina 

• Figure F-11: Cape Romain Wildlife Refuge (ROMA), South Carolina 

• Figure F-12: Great Smoky Mountains National Park (GRSM), Tennessee-North Carolina 

• Figure F-13: James River Face Wilderness Area (JARI), Virginia 

• Figure F-14: Shenandoah National Park (SHEN), Virginia 

• Figure F-15: Dolly Sods Wilderness Area (DOSO), West Virginia 

Nearby Class I Areas

• Figure F-16: Breton Island Wildlife Refuge (BRET), Louisiana 

• Figure F-17: Caney Creek Wilderness Area (CACR), Arkansas 

• Figure F-18: Upper Buffalo Wilderness Area (UPBU), Arkansas 

• Figure F-19: Mingo Wildlife Refuge (MING), Missouri 

• Figure F-20: Hercules Glade Wilderness Area (HEGL), Missouri 

• Figure F-21: Brigantine Wildlife Refuge (BRIG), New Jersey 
 F-2 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Sipsey - Best 20% Days (12 km)

15.57 15.57 15.57

14.37

5.03

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-1a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Sipsey (SIPS), 

Alabama and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Sipsey - Best 20% Days (36 km)

15.57 15.57 15.57

14.15

5.03

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-1b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Sipsey (SIPS), 

Alabama and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-3 

Best 20% Obs (left) vs 2002gt2a (right) at SIPS (12 km)

0

20

40

60

80

100

120

11 14 26 32 59 77 89 113 116 167 176 179 212 230 257 302 308 347 356 359 362 _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-1c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) 

daily extinction for Sipsey (SIPS), Alabama and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at SIPS (36 km)

0

20

40

60

80

100

120

11 14 26 32 59 77 89 113 116 167 176 179 212 230 257 302 308 347 356 359 362 _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-1d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) 

daily extinction for Sipsey (SIPS), Alabama and Best 20% (B20%) days in 2002.
 F-4 

Bext Response (2018g2b - 2002gt2a) at SIPS on Best 20% Days (12 km)

-60

-50

-40

-30

-20

-10

0

10

20

11 14 26 32 59 77 89 113 116 167 176 179 212 230 257 302 308 347 356 359 362 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-1e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) 

daily extinction for Sipsey (SIPS), Alabama and Best 20% (B20%) days in 2002.

Bext Response (2018g2a - 2002gt2a) at SIPS on Best 20% Days (36 km)

-70

-60

-50

-40

-30

-20

-10

0

10

11 14 26 32 59 77 89 113 116 167 176 179 212 230 257 302 308 347 356 359 362 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-1f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) 

daily extinction for Sipsey (SIPS), Alabama and Best 20% (B20%) days in 2002.
 F-5 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Chassahowitzka - Best 20% Days (12 km)

15.51 15.51 15.51

13.50

5.91

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-2a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for 

Chassahowitzka (CHAS), Florida and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 

12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Chassahowitzka - Best 20% Days (36 km)

15.51 15.51 15.51

13.19

5.91

0

5

10

15

20

25

30

35

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-2b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for 

Chassahowitzka (CHAS), Florida and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 

36 km modeling results 
 F-6 

Best 20% Obs (left) vs 2002gt2a (right) at CHAS (12 km)

0

10

20

30

40

50

60

70

80

90

38 68 71 104 146 161 164 170 173 176 182 191 203 224 227 239 242 248 266 320 344 347 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-2c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) 

daily extinction for Chassahowitzka Wildlife Refuge (CHAS), Florida and Best 20% (B20%) days 

in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at CHAS (36 km)

0

10

20

30

40

50

60

70

80

90

38 68 71 104 146 161 164 170 173 176 182 191 203 224 227 239 242 248 266 320 344 347 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-2d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) 

daily extinction for Chassahowitzka Wildlife Refuge (CHAS), Florida and Best 20% (B20%) days 

in 2002.
 F-7 

Bext Response (2018g2b - 2002gt2a) at CHAS on Best 20% Days (12 km)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

38 68 71 104 146 161 164 170 173 176 182 191 203 224 227 239 242 248 266 320 344 347 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-2e. Differences in modeled 2002 and 2018 Base G2 CMAQ 12 km results (2018-

2002) daily extinction for Chassahowitzka Wildlife Refuge (CHAS), Florida and Best 20% 

(B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at CHAS on Best 20% Days (36 km)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

38 68 71 104 146 161 164 170 173 176 182 191 203 224 227 239 242 248 266 320 344 347 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-2f. Differences in modeled 2002 and 2018 Base G2 CMAQ 36 km results (2018-

2002) daily extinction for Chassahowitzka Wildlife Refuge (CHAS), Florida and Best 20% 

(B20%) days in 2002.
 F-8 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Everglades - Best 20% Days (12 km)

11.69 11.69 11.69

11.44

5.21

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-3a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Everglades 

(EVER), Florida and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling 

results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Everglades - Best 20% Days (36 km)

11.69 11.69 11.69

14.44

5.21

0

5

10

15

20

25

30

35

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-3b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Everglades 

(EVER), Florida and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling 

results. 
 F-9 

Best 20% Obs (left) vs 2002gt2a (right) at EVER (12 km)

0

5

10

15

20

25

23 29 32 71 80 104 134 137 140 164 176 191 206 212 242 245 248 251 254 284 287 296 299 302 _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-3c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) 

daily extinction for Everglades (EVER), Florida and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at EVER (36 km)

0

5

10

15

20

25

23 29 32 71 80 104 134 137 140 164 176 191 206 212 242 245 248 251 254 284 287 296 299 302 _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-3d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) 

daily extinction for Everglades (EVER), Florida and Best 20% (B20%) days in 2002.
 F-10 

Bext Response (2018g2b - 2002gt2a) at EVER on Best 20% Days (12 km)

-8

-7

-6

-5

-4

-3

-2

-1

0

1

23 29 32 71 80 104 134 137 140 164 176 191 206 212 242 245 248 251 254 284 287 296 299 302 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-3e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) 

daily extinction for Everglades (EVER), Florida and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at EVER1 on Best 20% Days

-8

-7

-6

-5

-4

-3

-2

-1

0

1

23 29 32 71 80 104 134 137 140 164 176 191 206 212 242 245 248 251 254 284 287 296 299 302 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-3f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) 

daily extinction for Everglades (EVER), Florida and Best 20% (B20%) days in 2002.
 F-11 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Saint Marks - Best 20% Days (12 km)

14.37 14.37 14.37

12.67

5.39

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-4a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for St. Marks 

(SAMA), Florida and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling 

results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Saint Marks - Best 20% Days (36 km)

14.37 14.37 14.37

12.58

5.39

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-4b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for St. Marks 

(SAMA), Florida and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling 

results. 
 F-12 

Best 20% Obs (left) vs 2002gt2a (right) at SAMA (12 km)

0

10

20

30

40

50

60

70

80

90

11 14 20 32 38 68 80 158 161 173 176 179 194 206 209 218 224 239 266 302 344 356 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-4c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) 

daily extinction for St. Marks (SAMA), Florida and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at SAMA (36 km)

0

10

20

30

40

50

60

70

80

90

11 14 20 32 38 68 80 158 161 173 176 179 194 206 209 218 224 239 266 302 344 356 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-4d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) 

daily extinction for St. Marks (SAMA), Florida and Best 20% (B20%) days in 2002.
 F-13 

Bext Response (2018g2b - 2002gt2a) at SAMA on Best 20% Days (12 km)

-35

-30

-25

-20

-15

-10

-5

0

5

11 14 20 32 38 68 80 158 161 173 176 179 194 206 209 218 224 239 266 302 344 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-4e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) 

daily extinction for St. Marks (SAMA), Florida and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at SAMA on Best 20% Days (36 km)

-35

-30

-25

-20

-15

-10

-5

0

5

11 14 20 32 38 68 80 158 161 173 176 179 194 206 209 218 224 239 266 302 344 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-4f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) 

daily extinction for St. Marks (SAMA), Florida and Best 20% (B20%) days in 2002.
 F-14 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Cohutta - Best 20% Days (12 km)

13.77 13.77 13.77

11.74

4.32

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-5a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Cohutta 

(COHU), Georgia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km 

modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Cohutta - Best 20% Days (36 km)

13.77 13.77 13.77

11.96

4.32

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-5b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Cohutta 

(COHU), Georgia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km 

modeling results. 
 F-15 

Best 20% Obs (left) vs 2002gt2a (right) at COHU (12 km)

0

10

20

30

40

50

60

70

80

23 26 32 38 44 62 77 89 113 116 119 173 194 257 269 308 320 341 347 356 _ _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-5c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) 

daily extinction for Cohutta (COHU), Georgia and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at COHU (36 km)

0

10

20

30

40

50

60

70

80

23 26 32 38 44 62 77 89 113 116 119 173 194 257 269 308 320 341 347 356 _ _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-5d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) 

daily extinction for Cohutta (COHU), Georgia and Best 20% (B20%) days in 2002.
 F-16 

Bext Response (2018g2b - 2002gt2a) at COHU on Best 20% Days (12 km)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

23 26 32 38 44 62 77 89 113 116 119 173 194 257 269 308 320 341 347 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-5e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) 

daily extinction for Cohutta (COHU), Georgia and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at COHU on Best 20% Days (36 km)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

23 26 32 38 44 62 77 89 113 116 119 173 194 257 269 308 320 341 347 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-5f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) 

daily extinction for Cohutta (COHU), Georgia and Best 20% (B20%) days in 2002.
 F-17 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Okefenokee - Best 20% Days (12 km)

15.23 15.23 15.23

13.83

5.31

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-6a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Okefenokee (OKEF), 

Georgia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Okefenokee - Best 20% Days (36 km)

15.23 15.23 15.23

13.69

5.31

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-6a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Okefenokee (OKEF), 

Georgia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-18 

Best 20% Obs (left) vs 2002gt2a (right) at OKEF (12 km)

0

10

20

30

40

50

60

70

11 20 38 59 62 104 170 173 176 179 191 239 242 257 266 275 284 335 344 347 356 359 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-6c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Okefenokee (OKEF), Georgia and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at OKEF (36 km)

0

10

20

30

40

50

60

70

11 20 38 59 62 104 170 173 176 179 191 239 242 257 266 275 284 335 344 347 356 359 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-6d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Okefenokee (OKEF), Georgia and Best 20% (B20%) days in 2002.
 F-19 

Bext Response (2018g2b - 2002gt2a) at OKEF on Best 20% Days (12 km)

-25

-20

-15

-10

-5

0

5

11 20 38 59 62 104 170 173 176 179 191 239 242 257 266 275 284 335 344 347 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-6e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Okefenokee (OKEF), Georgia and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at OKEF on Best 20% Days (36 km)

-25

-20

-15

-10

-5

0

5

11 20 38 59 62 104 170 173 176 179 191 239 242 257 266 275 284 335 344 347 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-6f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Okefenokee (OKEF), Georgia and Best 20% (B20%) days in 2002.
 F-20 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Mammoth Cave - Best 20% Days (12 km)

16.51 16.51 16.51

15.57

4.99

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-7a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Mammoth Cave 

(MACA), Kentucky and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Mammoth Cave - Best 20% Days (36 km)

16.51 16.51 16.51

15.33

4.99

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-7b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Mammoth Cave 

(MACA), Kentucky and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-21 

Best 20% Obs (left) vs 2002gt2a (right) at MACA (12 km)

0

20

40

60

80

100

120

140

14 23 32 35 44 62 68 83 89 113 116 227 266 269 278 281 287 302 308 323 338 347 356 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-7c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Mammoth Cave (MACA), Kentucky and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at MACA (36 km)

0

20

40

60

80

100

120

140

14 23 32 35 44 62 68 83 89 113 116 227 266 269 278 281 287 302 308 323 338 347 356 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-7d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Mammoth Cave (MACA), Kentucky and Best 20% (B20%) days in 2002.
 F-22 

Bext Response (2018g2b - 2002gt2a) at MACA on Best 20% Days (12 km)

-40

-30

-20

-10

0

10

20

14 23 32 35 44 62 68 83 89 113 116 227 266 269 278 281 287 302 308 323 338 347 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-7d. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Mammoth Cave (MACA), Kentucky and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at MACA on Best 20% Days (36 km)

-40

-30

-20

-10

0

10

20

14 23 32 35 44 62 68 83 89 113 116 227 266 269 278 281 287 302 308 323 338 347 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-7e. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Mammoth Cave (MACA), Kentucky and Best 20% (B20%) days in 2002.
 F-23 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Linville Gorge - Best 20% Days (12 km)

11.11 11.11 11.11

9.64

4.08

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-8a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Linville Gorge (LIGO), 

North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Linville Gorge - Best 20% Days (36 km)

11.11 11.11 11.11

9.80

4.08

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-8b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Linville Gorge (LIGO), 

North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results.. 
 F-24 

Best 20% Obs (left) vs 2002gt2a (right) at LIGO (12 km)

0

10

20

30

40

50

60

70

5 8 11 23 26 38 62 77 89 104 116 119 302 308 320 326 341 347 356 359 362 _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-8c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Linville Gorge (LIGO), North Carolina and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at LIGO (36 km)

0

10

20

30

40

50

60

70

5 8 11 23 26 38 62 77 89 104 116 119 302 308 320 326 341 347 356 359 362 _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-8d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Linville Gorge (LIGO), North Carolina and Best 20% (B20%) days in 2002.
 F-25 

Bext Response (2018g2b - 2002gt2a) at LIGO on Best 20% Days (12 km)

-20

-15

-10

-5

0

5

10

5 8 11 23 26 38 62 77 89 104 116 119 302 308 320 326 341 347 356 359 362 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-8e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Linville Gorge (LIGO), North Carolina and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at LIGO on Best 20% Days (36 km)

-20

-15

-10

-5

0

5

10

5 8 11 23 26 38 62 77 89 104 116 119 302 308 320 326 341 347 356 359 362 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-8f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Linville Gorge (LIGO), North Carolina and Best 20% (B20%) days in 2002.
 F-26 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Shining Rock - Best 20% Days (12 km)

8.21 8.21 8.21

6.91

2.51

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-9a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Shining Rock (SHRO), 

North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Shining Rock - Best 20% Days (36 km)

8.21 8.21 8.21

6.92

2.51

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-9b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Shining Rock (SHRO), 

North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-27 

Best 20% Obs (left) vs 2002gt2a (right) at SHRO (12 km)

0

10

20

30

40

50

60

70

80

5 8 11 26 38 50 68 71 86 89 104 257 269 299 302 308 320 326 341 344 347 353 359 362 _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-9c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Shining Rock (SHRO), North Carolina and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at SHRO (36 km)

0

10

20

30

40

50

60

70

80

5 8 11 26 38 50 68 71 86 89 104 257 269 299 302 308 320 326 341 344 347 353 359 362 _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-9d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Shining Rock (SHRO), North Carolina and Best 20% (B20%) days in 2002.
 F-28 

Bext Response (2018g2b - 2002gt2a) at SHRO on Best 20% Days (12 km)

-35

-30

-25

-20

-15

-10

-5

0

5

10

15

5 8 11 26 38 50 68 71 86 89 104 257 269 299 302 308 320 326 341 344 347 353 359 362 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-9e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Shining Rock (SHRO), North Carolina and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at SHRO on Best 20% Days (36 km)

-35

-30

-25

-20

-15

-10

-5

0

5

10

15

5 8 11 26 38 50 68 71 86 89 104 257 269 299 302 308 320 326 341 344 347 353 359 362 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-9f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Shining Rock (SHRO), North Carolina and Best 20% (B20%) days in 2002.
 F-29 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Swanquarter - Best 20% Days (12 km)

12.02 12.02 12.02

10.96

5.46

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-10a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Swanquarter (SWAN), 

North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Swanquarter - Best 20% Days (36 km)

12.02 12.02 12.02

10.88

5.46

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-10b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Swanquarter (SWAN), 

North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results.. 
 F-30 

Best 20% Obs (left) vs 2002gt2a (right) at SWAN (12 km)

0

10

20

30

40

50

60

70

80

14 26 68 104 125 173 176 194 221 227 242 251 263 269 284 290 314 320 332 335 344 353 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-10c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Swanquarter (SWAN), North Carolina and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at SWAN (36 km)

0

10

20

30

40

50

60

70

80

14 26 68 104 125 173 176 194 221 227 242 251 263 269 284 290 314 320 332 335 344 353 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-10d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Swanquarter (SWAN), North Carolina and Best 20% (B20%) days in 2002.
 F-31 

Bext Response (2018g2b - 2002gt2a) at SWAN on Best 20% Days (12 km)

-25

-20

-15

-10

-5

0

5

14 26 68 104 125 173 176 194 221 227 242 251 263 269 284 290 314 320 332 335 344 353 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-10e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Swanquarter (SWAN), North Carolina and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at SWAN on Best 20% Days (36 km)

-25

-20

-15

-10

-5

0

5

14 26 68 104 125 173 176 194 221 227 242 251 263 269 284 290 314 320 332 335 344 353 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-10f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Swanquarter (SWAN), North Carolina and Best 20% (B20%) days in 2002.
 F-32 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Cape Romain - Best 20% Days (12 km)

14.29 14.29 14.29

12.74

5.92

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-11a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Cape Romain (ROMA), 

South Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Cape Romain - Best 20% Days (36 km)

14.29 14.29 14.29

12.82

5.92

0

5

10

15

20

25

30

35

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-11b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Cape Romain 

(ROMA), South Carolina and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling 

results. 
 F-33 

Best 20% Obs (left) vs 2002gt2a (right) at ROMA (12 km)

0

10

20

30

40

50

60

70

80

90

14 23 62 65 68 92 104 107 125 161 170 173 176 191 227 242 245 248 263 266 269 284 353 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-11c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Cape Romain (ROMA), South Carolina and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at ROMA (36 km)

0

10

20

30

40

50

60

70

80

90

14 23 62 65 68 92 104 107 125 161 170 173 176 191 227 242 245 248 263 266 269 284 353 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-11d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Cape Romain (ROMA), South Carolina and Best 20% (B20%) days in 2002.
 F-34 

Bext Response (2018g2b - 2002gt2a) at ROMA on Best 20% Days (12 km)

-30

-25

-20

-15

-10

-5

0

5

14 23 62 65 68 92 104 107 125 161 170 173 176 191 227 242 245 248 263 266 269 284 353 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-11e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Cape Romain (ROMA), South Carolina and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at ROMA on Best 20% Days (36 km)

-30

-25

-20

-15

-10

-5

0

5

10

14 23 62 65 68 92 104 107 125 161 170 173 176 191 227 242 245 248 263 266 269 284 353 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-11f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Cape Romain (ROMA), South Carolina and Best 20% (B20%) days in 2002.
 F-35 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Great Smoky Mountains - Best 20% Days (12 km)

13.58 13.58 13.58

12.15

4.54

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-12a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Great Smoky 

Mountains (GRSM), Tennessee-North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 

CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Great Smoky Mountains - Best 20% Days (36 km)

13.58 13.58 13.58

12.02

4.54

0

5

10

15

20

25

30

35

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-12b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Great Smoky 

Mountains (GRSM), Tennessee-North Carolina and Best 20% (B20%) days using 2002/2018 Base G2 

CMAQ 36 km modeling results.. 
 F-36 

Best 20% Obs (left) vs 2002gt2a (right) at GRSM (12 km)

0

20

40

60

80

100

120

8 11 14 23 32 38 50 59 62 68 89 116 194 257 269 299 302 308 320 326 341 347 356 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-12c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Great Smoky Mountains (GRSM), Tennessee-North Carolina and Best 20% (B20%) days in 

2002. 

Best 20% Obs (left) vs 2002gt2a (right) at GRSM (36 km)

0

20

40

60

80

100

120

8 11 14 23 32 38 50 59 62 68 89 116 194 257 269 299 302 308 320 326 341 347 356 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-12d. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Great Smoky Mountains (GRSM), Tennessee-North Carolina and Best 20% (B20%) days in 

2002.
 F-37 

Bext Response (2018g2b - 2002gt2a) at GRSM on Best 20% Days (12 km)

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

15

8 11 14 23 32 38 50 59 62 68 89 116 194 257 269 299 302 308 320 326 341 347 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-12e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Great Smoky Mountains (GRSM), Tennessee-North Carolina and Best 20% (B20%) days in 

2002. 

Bext Response (2018g2a - 2002gt2a) at GRSM on Best 20% Days (36 km)

-45

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

15

8 11 14 23 32 38 50 59 62 68 89 116 194 257 269 299 302 308 320 326 341 347 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-12f. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Great Smoky Mountains (GRSM), Tennessee-North Carolina and Best 20% (B20%) days in 

2002.
 F-38 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

James River Face - Best 20% Days (12 km)

14.21 14.21 14.21

12.48

4.38

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-13a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for James River Face 

(JARI), Virginia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

James River Face - Best 20% Days (36 km)

14.21 14.21 14.21

12.43

4.38

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-13b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for James River Face 

(JARI), Virginia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-39 

Best 20% Obs (left) vs 2002gt2a (right) at JARI (12 km)

0

10

20

30

40

50

60

70

80

90

8 11 23 26 35 44 59 68 77 101 104 113 116 134 158 245 299 302 326 332 335 356 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-13c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for James River Face (JARI), Virginia and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at JARI (36 km)

0

10

20

30

40

50

60

70

80

90

8 11 23 26 35 44 59 68 77 101 104 113 116 134 158 245 299 302 326 332 335 356 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-13d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for James River Face (JARI), Virginia and Best 20% (B20%) days in 2002.
 F-40 

Bext Response (2018g2b - 2002gt2a) at JARI on Best 20% Days (12 km)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

8 11 23 26 35 44 59 68 77 101 104 113 116 134 158 245 299 302 326 332 335 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-13e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for James River Face (JARI), Virginia and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at JARI on Best 20% Days (36 km)

-40

-35

-30

-25

-20

-15

-10

-5

0

5

10

8 11 23 26 35 44 59 68 77 101 104 113 116 134 158 245 299 302 326 332 335 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-13f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for James River Face (JARI), Virginia and Best 20% (B20%) days in 2002.
 F-41 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Shenandoah - Best 20% Days (12 km)

10.93 10.93 10.93

8.79

3.14

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-14a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Shenandoah (SHEN), 

Virginia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Shenandoah - Best 20% Days (36 km)

10.93 10.93 10.93

8.85

3.14

0

5

10

15

20

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-14b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Shenandoah (SHEN), 

Virginia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results.. 
 F-42 

Best 20% Obs (left) vs 2002gt2a (right) at SHEN (12 km)

0

20

40

60

80

100

120

140

160

180

5 14 23 26 38 50 62 68 77 158 206 221 245 269 284 320 335 338 341 344 347 356 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-14c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Shenandoah (SHEN), Virginia and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at SHEN (36 km)

0

20

40

60

80

100

120

140

160

180

5 14 23 26 38 50 62 68 77 158 206 221 245 269 284 320 335 338 341 344 347 356 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-14d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Shenandoah (SHEN), Virginia and Best 20% (B20%) days in 2002.
 F-43 

Bext Response (2018g2b - 2002gt2a) at SHEN on Best 20% Days (12 km)

-120

-100

-80

-60

-40

-20

0

20

5 14 23 26 38 50 62 68 77 158 206 221 245 269 284 320 335 338 341 344 347 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-14e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Shenandoah (SHEN), Virginia and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at SHEN on Best 20% Days (36 km)

-120

-100

-80

-60

-40

-20

0

20

5 14 23 26 38 50 62 68 77 158 206 221 245 269 284 320 335 338 341 344 347 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-14f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Shenandoah (SHEN), Virginia and Best 20% (B20%) days in 2002.
 F-44 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Dolly Sods - Best 20% Days (12 km)

12.28 12.28 12.28

10.79

3.64

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-15a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Dolly Sods (DOSO), 

West Virginia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Dolly Sods - Best 20% Days (36 km)

12.28 12.28 12.28

10.78

3.64

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-15b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Dolly Sods (DOSO), 

West Virginia and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-45 

Best 20% Obs (left) vs 2002gt2a (right) at DOSO (12 km)

0

10

20

30

40

50

60

70

80

5 14 23 26 50 68 89 104 119 158 284 293 299 302 320 326 338 341 347 356 359 _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-15c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Dolly Sods (DOSO), West Virginia and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at DOSO (36 km)

0

10

20

30

40

50

60

70

80

5 14 23 26 50 68 89 104 119 158 284 293 299 302 320 326 338 341 347 356 359 _ _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-15d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Dolly Sods (DOSO), West Virginia and Best 20% (B20%) days in 2002.
 F-46 

Bext Response (2018g2b - 2002gt2a) at DOSO on Best 20% Days (12 km)

-25

-20

-15

-10

-5

0

5

10

5 14 23 26 50 68 89 104 119 158 284 293 299 302 320 326 338 341 347 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-15e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Dolly Sods (DOSO), West Virginia and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at DOSO on Best 20% Days (36 km)

-25

-20

-15

-10

-5

0

5

10

5 14 23 26 50 68 89 104 119 158 284 293 299 302 320 326 338 341 347 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-15f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Dolly Sods (DOSO), West Virginia and Best 20% (B20%) days in 2002.
 F-47 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Breton - Best 20% Days (12 km)

14.04 14.04 14.04

13.54

5.33

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-16a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Breton Island (BRET), 

Louisiana and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Breton - Best 20% Days (36 km)

14.04 14.04 14.04

13.50

5.33

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-16b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Breton Island (BRET), 

Louisiana and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-48 

Best 20% Obs (left) vs 2002gt2a (right) at BRET (12 km)

0

5

10

15

20

25

30

35

40

8 14 20 32 38 68 80 101 149 158 170 176 191 209 227 233 236 245 299 302 335 356 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-16c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Breton Island (BRET), Louisiana and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at BRET (36 km)

0

5

10

15

20

25

30

35

40

8 14 20 32 38 68 80 101 149 158 170 176 191 209 227 233 236 245 299 302 335 356 359 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-16d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Breton Island (BRET), Louisiana and Best 20% (B20%) days in 2002.
 F-49 

Bext Response (2018g2b - 2002gt2a) at BRET on Best 20% Days (12 km)

-10

-8

-6

-4

-2

0

2

4

6

8 14 20 32 38 68 80 101 149 158 170 176 191 209 227 233 236 245 299 302 335 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-16e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Breton Island (BRET), Louisiana and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at BRET on Best 20% Days (36 km)

-10

-8

-6

-4

-2

0

2

4

6

8 14 20 32 38 68 80 101 149 158 170 176 191 209 227 233 236 245 299 302 335 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-16f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Breton Island (BRET), Louisiana and Best 20% (B20%) days in 2002.
 F-50 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Caney Creek - Best 20% Days (12 km)

11.24 11.24 11.24

10.15

4.23

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-17a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Caney Creek (CACR), 

Arkansas and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Caney Creek - Best 20% Days (36 km)

11.24 11.24 11.24

10.27

4.23

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-17b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Caney Creek (CACR), 

Arkansas and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-51 

Best 20% Obs (left) vs 2002gt2a (right) at CACR (12 km)

0

20

40

60

80

100

120

11 14 26 89 98 116 197 266 278 284 287 293 299 302 311 323 329 335 338 353 356 359 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-17c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Caney Creek (CACR), Arkansas and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at CACR (36 km)

0

20

40

60

80

100

120

11 14 26 89 98 116 197 266 278 284 287 293 299 302 311 323 329 335 338 353 356 359 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-17d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Caney Creek (CACR), Arkansas and Best 20% (B20%) days in 2002.
 F-52 

Bext Response (2018g2b - 2002gt2a) at CACR on Best 20% Days (12 km)

-30

-25

-20

-15

-10

-5

0

5

11 14 26 89 98 116 197 266 278 284 287 293 299 302 311 323 329 335 338 353 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-17e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Caney Creek (CACR), Arkansas and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at CACR on Best 20% Days (36 km)

-30

-25

-20

-15

-10

-5

0

5

11 14 26 89 98 116 197 266 278 284 287 293 299 302 311 323 329 335 338 353 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-17f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Caney Creek (CACR), Arkansas and Best 20% (B20%) days in 2002.
 F-53 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Upper Buffalo - Best 20% Days (12 km)

11.71 11.71 11.71

10.61

4.13

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-18a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Upper Buffalo (UPBU), 

Arkansas and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Upper Buffalo - Best 20% Days (36 km)

11.71 11.71 11.71

10.66

4.13

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-18b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Upper Buffalo (UPBU), 

Arkansas and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-54 

Best 20% Obs (left) vs 2002gt2a (right) at UPBU (12 km)

0

10

20

30

40

50

60

70

80

14 26 47 68 89 98 116 119 164 167 176 227 266 278 281 287 290 302 311 323 335 353 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-18c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Upper Buffalo (UPBU), Arkansas and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at UPBU (36 km)

0

10

20

30

40

50

60

70

80

14 26 47 68 89 98 116 119 164 167 176 227 266 278 281 287 290 302 311 323 335 353 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-18d. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Upper Buffalo (UPBU), Arkansas and Best 20% (B20%) days in 2002
 F-55 

Bext Response (2018g2b - 2002gt2a) at UPBU on Best 20% Days (12 km)

-14

-12

-10

-8

-6

-4

-2

0

2

4

14 26 47 68 89 98 116 119 164 167 176 227 266 278 281 287 290 302 311 323 335 353 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-18e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Upper Buffalo (UPBU), Arkansas and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at UPBU on Best 20% Days (36 km)

-14

-12

-10

-8

-6

-4

-2

0

2

4

14 26 47 68 89 98 116 119 164 167 176 227 266 278 281 287 290 302 311 323 335 353 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-18f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Upper Buffalo (UPBU), Arkansas and Best 20% (B20%) days in 2002.
 F-56 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Mingo - Best 20% Days (12 km)

14.41 14.41 14.41

13.50

5.35

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-19a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Mingo (MING), 

Missouri and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Mingo - Best 20% Days (36 km)

14.41 14.41 14.41

13.49

5.35

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-19b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Mingo (MING), 

Missouri and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results.. 
 F-57 

Best 20% Obs (left) vs 2002gt2a (right) at MING (12 km)

0

20

40

60

80

100

120

140

160

180

200

14 32 44 62 116 134 137 140 164 167 176 200 227 263 266 278 281 290 302 308 353 356 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-19c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Mingo (MING), Missouri and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at MING (36 km)

0

20

40

60

80

100

120

140

160

180

200

14 32 44 62 116 134 137 140 164 167 176 200 227 263 266 278 281 290 302 308 353 356 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-19d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Mingo (MING), Missouri and Best 20% (B20%) days in 2002.
 F-58 

Bext Response (2018g2b - 2002gt2a) at MING on Best 20% Days (12 km)

-25

-20

-15

-10

-5

0

5

10

14 32 44 62 116 134 137 140 164 167 176 200 227 263 266 278 281 290 302 308 353 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-19e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Mingo (MING), Missouri and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at MING on Best 20% Days (36 km)

-25

-20

-15

-10

-5

0

5

10

14 32 44 62 116 134 137 140 164 167 176 200 227 263 266 278 281 290 302 308 353 356 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-19f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Mingo (MING), Missouri and Best 20% (B20%) days in 2002.
 F-59 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Hercules - Glade - Best 20% Days (12 km)

12.84 12.84 12.84

11.97

4.67

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-20a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Hercules Glade 

(HEGL), Missouri and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Hercules - Glade - Best 20% Days (36 km)

12.84 12.84 12.84

11.96

4.67

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-20b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Hercules Glade 

(HEGL), Missouri and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km modeling results. 
 F-60 

Best 20% Obs (left) vs 2002gt2a (right) at HEGL (12 km)

0

20

40

60

80

100

120

140

160

14 26 44 68 71 89 113 116 119 134 137 227 266 278 281 287 290 302 308 311 317 335 353 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-20c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) daily 

extinction for Hercules Glade (HEGL), Missouri and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at HEGL (36 km)

0

20

40

60

80

100

120

140

160

14 26 44 68 71 89 113 116 119 134 137 227 266 278 281 287 290 302 308 311 317 335 353 _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-20d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) daily 

extinction for Hercules Glade (HEGL), Missouri and Best 20% (B20%) days in 2002.
 F-61 

Bext Response (2018g2b - 2002gt2a) at HEGL on Best 20% Days (12 km)

-20

-15

-10

-5

0

5

14 26 44 68 71 89 113 116 119 134 137 227 266 278 281 287 290 302 308 311 317 335 353 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-20e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-2002) daily 

extinction for Hercules Glade (HEGL), Missouri and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at HEGL on Best 20% Days (36 km)

-20

-15

-10

-5

0

5

14 26 44 68 71 89 113 116 119 134 137 227 266 278 281 287 290 302 308 311 317 335 353 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-20f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-2002) daily 

extinction for Hercules Glade (HEGL), Missouri and Best 20% (B20%) days in 2002.
 F-62 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Brigantine - Best 20% Days (12 km)

14.33 14.33 14.33

13.24

5.45

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-21a. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Brigantine 

(BRIG), New Jersey and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 12 km 

modeling results. 

Reasonable Progress Assessment Base G2, new IMPROVE Algorithm

Brigantine - Best 20% Days (36 km)

14.33 14.33 14.33

13.09

5.45

0

5

10

15

20

25

2000 2004 2008 2012 2016 2020 2024 2028 2032 2036 2040 2044 2048 2052 2056 2060 2064

Year

Haziness Index (Deciviews)

Baseline Natural Condition (20% Best Days) Observation Method 1 Prediction

Figure F-21b. 2018 Visibility Projections and 2018 URP Glidepath in deciview for Brigantine 

(BRIG), New Jersey and Best 20% (B20%) days using 2002/2018 Base G2 CMAQ 36 km 

modeling results. 
 F-63 

Best 20% Obs (left) vs 2002gt2a (right) at BRIG (12 km)

0

20

40

60

80

100

120

140

32 68 77 113 119 125 158 194 206 221 251 263 269 281 284 287 302 317 332 335 356 359 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-21c. Comparison of observed (left) and 2002 Base G2 CMAQ 12 km modeled (right) 

daily extinction for Brigantine (BRIG), New Jersey and Best 20% (B20%) days in 2002. 

Best 20% Obs (left) vs 2002gt2a (right) at BRIG (36 km)

0

20

40

60

80

100

120

140

32 68 77 113 119 125 158 194 206 221 251 263 269 281 284 287 302 317 332 335 356 359 _ _ _ Avg

Julian Day in Best 20% group

bEXT (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-21d. Comparison of observed (left) and 2002 Base G2 CMAQ 36 km modeled (right) 

daily extinction for Brigantine (BRIG), New Jersey and Best 20% (B20%) days in 2002.
 F-64 

Bext Response (2018g2b - 2002gt2a) at BRIG on Best 20% Days (12 km)

-30

-25

-20

-15

-10

-5

0

5

10

32 68 77 113 119 125 158 194 206 221 251 263 269 281 284 287 302 317 332 335 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-21e. Differences in modeled 2002 and 2018 Base G CMAQ 12 km results (2018-

2002) daily extinction for Brigantine (BRIG), New Jersey and Best 20% (B20%) days in 2002. 

Bext Response (2018g2a - 2002gt2a) at BRIG on Best 20% Days (36 km)

-30

-25

-20

-15

-10

-5

0

5

10

32 68 77 113 119 125 158 194 206 221 251 263 269 281 284 287 302 317 332 335 356 359 Avg

Julian Day

Delta Bext (1/Mm)

bCM

bSOIL

bEC

bOC

bNO3

bSO4

Figure F-21f. Differences in modeled 2002 and 2018 Base G CMAQ 36 km results (2018-

2002) daily extinction for Brigantine (BRIG), New Jersey and Best 20% (B20%) days in 2002.