Class 1 Area

(20% worst days) State 2005 Baseline Visibility

2017 

Reference 

2017 Tier3 

Control

Sipsey Wilderness AL 29.03 21.67 21.80

Caney Creek Wilderness AR 26.36 21.00 21.03

Upper Buffalo Wilderness AR 26.27 21.24 21.30

Chiricahua NM AZ 12.89 12.29 12.28

Chiricahua Wilderness AZ 12.89 12.27 12.27

Galiuro Wilderness AZ 12.89 12.37 12.35

Grand Canyon NP AZ 11.86 11.03 11.02

Mazatzal Wilderness AZ 13.95 12.87 12.84

Mount Baldy Wilderness AZ 11.32 10.91 10.91

Petrified Forest NP AZ 13.56 12.90 12.89

Pine Mountain Wilderness AZ 13.95 12.81 12.78

Saguaro NM AZ 14.39 13.72 13.71

Sierra Ancha Wilderness AZ 14.45 13.55 13.53

Superstition Wilderness AZ 14.15 13.15 13.13

Sycamore Canyon Wilderness AZ 15.45 14.83 14.81

Agua Tibia Wilderness CA 22.36 18.87 18.87

Ansel Adams Wilderness (Minarets) CA 15.24 14.48 14.48

Caribou Wilderness CA 13.65 12.75 12.75

Cucamonga Wilderness CA 18.44 15.83 15.83

Desolation Wilderness CA 12.87 11.89 11.88

Emigrant Wilderness CA 16.87 15.86 15.85

Hoover Wilderness CA 11.61 11.05 11.05

John Muir Wilderness CA 15.24 14.41 14.42

Joshua Tree NM CA 18.90 16.74 16.72

Kaiser Wilderness CA 15.24 14.21 14.21

Kings Canyon NP CA 23.73 22.29 22.29

Lassen Volcanic NP CA 13.65 12.78 12.77

Lava Beds NM CA 14.13 13.14 13.13

Mokelumne Wilderness CA 12.87 12.04 12.03

Pinnacles NM CA 17.90 15.64 15.61

Point Reyes NS CA 22.40 20.89 20.87

Redwood NP CA 18.55 17.99 17.97

San Gabriel Wilderness CA 18.44 15.86 15.86

San Gorgonio Wilderness CA 21.43 19.50 19.50

San Jacinto Wilderness CA 21.43 18.70 18.71

San Rafael Wilderness CA 19.43 17.63 17.61

Sequoia NP CA 23.73 21.90 21.88

South Warner Wilderness CA 14.13 13.34 13.33

Thousand Lakes Wilderness CA 13.65 12.76 12.75

Ventana Wilderness CA 17.90 16.48 16.45

Yosemite NP CA 16.87 15.87 15.86

Black Canyon of the Gunnison NM CO 10.00 9.32 9.32

Eagles Nest Wilderness CO 8.82 8.27 8.26

Flat Tops Wilderness CO 8.82 8.43 8.43

Great Sand Dunes NM CO 11.82 11.34 11.34
La Garita Wilderness CO 10.00 9.59 9.59

Maroon Bells-Snowmass Wilderness CO 8.82 8.38 8.38

Mesa Verde NP CO 12.14 11.46 11.45

Mount Zirkel Wilderness CO 9.72 9.29 9.29

Rawah Wilderness CO 9.72 9.29 9.29

Rocky Mountain NP CO 12.85 12.37 12.36

Weminuche Wilderness CO 10.00 9.58 9.58

West Elk Wilderness CO 8.82 8.35 8.35

Everglades NP FL 22.31 19.30 19.06

Okefenokee GA 27.13 21.29 21.44

Wolf Island GA 27.13 21.10 21.12

Craters of the Moon NM ID 14.06 13.30 13.30

Sawtooth Wilderness ID 14.97 14.75 14.74

Selway-Bitterroot Wilderness ID 17.11 16.83 16.83

Mammoth Cave NP KY 31.37 22.87 23.09

Acadia NP ME 22.89 18.51 18.80

Moosehorn ME 21.72 17.81 18.01

Roosevelt Campobello International Park ME 21.72 17.68 17.95

Isle Royale NP MI 20.74 18.69 18.64

Seney MI 24.16 21.32 21.33

Boundary Waters Canoe Area MN 20.20 17.13 17.05

Voyageurs NP MN 19.27 17.03 16.95

Hercules-Glades Wilderness MO 26.75 21.92 21.99

Anaconda-Pintler Wilderness MT 17.11 16.73 16.72

Bob Marshall Wilderness MT 16.13 15.71 15.71

Cabinet Mountains Wilderness MT 14.31 13.74 13.74

Gates of the Mountains Wilderness MT 11.94 11.56 11.56

Glacier NP MT 19.62 18.81 18.82

Medicine Lake MT 18.21 17.65 17.65

Mission Mountains Wilderness MT 16.13 15.57 15.57

Red Rock Lakes MT 11.19 10.78 10.78

Scapegoat Wilderness MT 16.13 15.68 15.68

UL Bend MT 15.49 15.17 15.17

Linville Gorge Wilderness NC 28.77 20.85 21.23

Shining Rock Wilderness NC 28.54 20.47 20.78

Lostwood ND 19.57 18.48 18.28

Theodore Roosevelt NP ND 17.74 16.71 16.51

Great Gulf Wilderness NH 22.82 16.73 17.01

Presidential Range-Dry River Wilderness NH 22.82 16.68 16.97

Brigantine NJ 29.01 21.56 21.88

Bandelier NM NM 11.97 10.89 10.88

Bosque del Apache NM 13.81 12.78 12.76

Carlsbad Caverns NP NM 17.19 14.93 15.00

Gila Wilderness NM 13.12 12.57 12.56

Pecos Wilderness NM 9.60 9.08 9.07

Salt Creek NM 18.27 16.70 16.70

San Pedro Parks Wilderness NM 10.42 9.87 9.87
Wheeler Peak Wilderness NM 9.60 8.92 8.92

White Mountain Wilderness NM 13.01 12.16 12.16

Jarbidge Wilderness NV 12.26 11.98 11.98

Wichita Mountains OK 23.81 19.38 19.18

Crater Lake NP OR 13.21 12.52 12.51

Diamond Peak Wilderness OR 13.21 12.45 12.44

Eagle Cap Wilderness OR 17.34 16.36 16.36

Gearhart Mountain Wilderness OR 13.21 12.69 12.68

Hells Canyon Wilderness OR 19.00 18.00 18.00

Kalmiopsis Wilderness OR 16.38 15.48 15.46

Mount Hood Wilderness OR 14.68 13.33 13.30

Mount Jefferson Wilderness OR 15.80 14.96 14.95

Mount Washington Wilderness OR 15.80 14.95 14.93

Mountain Lakes Wilderness OR 13.21 12.44 12.43

Strawberry Mountain Wilderness OR 17.34 16.66 16.65

Three Sisters Wilderness OR 15.80 15.02 15.01

Cape Romain SC 26.48 20.61 20.72

Badlands NP SD 17.14 15.56 15.50

Wind Cave NP SD 15.84 14.81 14.72

Great Smoky Mountains NP TN 30.28 22.32 22.57

Joyce-Kilmer-Slickrock Wilderness TN 30.28 22.03 22.29

Big Bend NP TX 17.30 15.76 15.71

Guadalupe Mountains NP TX 17.19 14.95 15.03

Arches NP UT 10.77 10.13 10.13

Bryce Canyon NP UT 11.62 10.95 10.95

Canyonlands NP UT 10.77 10.15 10.13

Capitol Reef NP UT 10.86 10.46 10.46

James River Face Wilderness VA 29.12 20.45 20.61

Shenandoah NP VA 29.31 20.24 20.67

Lye Brook Wilderness VT 24.45 17.72 17.75

Alpine Lake Wilderness WA 16.99 15.59 15.55

Glacier Peak Wilderness WA 13.29 12.26 12.25

Goat Rocks Wilderness WA 12.67 11.54 11.52

Mount Adams Wilderness WA 12.67 11.57 11.56

Mount Rainier NP WA 17.07 15.77 15.75

North Cascades NP WA 13.29 12.24 12.23

Olympic NP WA 15.83 14.63 14.61

Pasayten Wilderness WA 15.35 14.34 14.32

Dolly Sods Wilderness WV 29.05 20.23 20.82

Otter Creek Wilderness WV 29.05 20.34 20.90

Bridger Wilderness WY 10.73 10.38 10.38

Fitzpatrick Wilderness WY 10.73 10.38 10.38

Grand Teton NP WY 11.19 10.73 10.72

North Absaroka Wilderness WY 11.30 10.99 10.99

Teton Wilderness WY 11.19 10.81 10.80

Washakie Wilderness WY 11.30 10.99 10.99

Yellowstone NP WY 11.19 10.76 10.76
16.871 14.902 14.927

0.59

-0.24

0.00

-0.16

Source of natural background data: Guidance for Estimating Natural Visibility Conditions Under the Regional Haze Rule (EPA, 

139 Class 1 Area Average Visibility (dv)

Maximum degradation in Visibility (dv)

2030 Tier 3- 2030 Reference

Maximum improvement in Visibility (dv)

2030 Tier 3- 2030 Reference

Dolly Sods Wilderness

Everglades National Park

Glacier NP, Fitzpatrick Wilderness, Gates of the Moun

Canyon NP, Bridger Wilderness, Weminuche Wilder

Wilderness, La Garita Wilderness, Scapegoat Wi

Wilderness, Anaconda-Pintler Wilde

Maximum degradation in Visibility (dv)

2017 Tier 3- 2017 Reference

Maximum improvement in Visibility (dv)

2017 Tier 3- 2017 Reference
2030 

Reference 

2030 Tier3 

Control

Natural 

Background

21.84 21.76 11.39

21.10 21.02 11.33

21.35 21.28 11.28

12.23 12.21 6.92

12.22 12.20 6.91

12.21 12.15 6.88

10.89 10.86 6.95

12.61 12.55 6.91

10.85 10.84 6.95

12.75 12.72 6.97

12.54 12.48 6.92

13.57 13.55 6.84

13.33 13.28 6.92

12.99 12.93 6.88

14.70 14.67 6.96

18.19 18.09 7.17

14.29 14.25 7.12

12.61 12.57 7.29

15.42 15.32 7.17

11.76 11.73 7.13

15.69 15.65 7.14

10.95 10.94 7.12

14.25 14.22 7.14

16.14 15.98 7.08

13.99 13.95 7.13

21.99 21.91 7.13

12.61 12.56 7.31

13.20 13.17 7.49

11.91 11.88 7.14

15.43 15.31 7.34

21.08 20.99 7.39

17.77 17.73 7.81

15.37 15.26 7.17

19.01 18.89 7.10

17.67 17.52 7.12

17.30 17.21 7.28

21.52 21.42 7.13

13.30 13.27 7.32

12.60 12.55 7.32

16.21 16.07 7.32

15.71 15.67 7.14

9.29 9.28 7.06

8.22 8.20 7.08

8.39 8.38 7.07

11.31 11.30 7.10
9.54 9.54 7.06

8.36 8.35 7.07

11.48 11.46 7.09

9.28 9.27 7.08

9.26 9.25 7.08

12.34 12.32 7.05

9.51 9.51 7.06

8.33 8.32 7.07

19.10 19.04 11.15

21.47 21.40 11.45

21.18 21.12 11.42

13.10 13.05 7.13

14.75 14.75 7.15

16.86 16.85 7.32

23.14 23.07 11.53

18.83 18.80 11.45

18.03 18.01 11.36

17.96 17.94 11.36

18.74 18.68 11.22

21.44 21.35 11.37

17.16 17.10 11.21

17.05 16.99 11.09

22.04 21.97 11.27

16.77 16.77 7.28

15.74 15.73 7.36

13.79 13.78 7.43

11.57 11.57 7.22

18.81 18.81 7.56

17.58 17.57 7.30

15.62 15.61 7.39

10.74 10.72 7.14

15.70 15.70 7.29

15.13 15.12 7.18

21.24 21.19 11.43

20.81 20.73 11.45

18.39 18.36 7.33

16.61 16.58 7.31

17.05 17.01 11.31

17.00 16.96 11.33

21.93 21.84 11.28

10.77 10.75 7.02

12.63 12.61 6.97

15.03 15.00 7.02

12.53 12.52 6.95

9.01 8.99 7.04

16.67 16.64 6.99

9.78 9.77 7.03
8.82 8.80 7.07

12.20 12.19 6.98

11.98 11.97 7.10

19.29 19.18 11.07

12.62 12.60 7.71

12.56 12.54 7.77

16.51 16.48 7.34

12.68 12.66 7.46

17.82 17.76 7.32

15.60 15.56 7.71

13.53 13.46 7.77

15.12 15.09 7.81

15.12 15.09 7.89

12.57 12.55 7.57

16.55 16.51 7.49

15.18 15.15 7.87

20.76 20.69 11.36

15.56 15.54 7.30

14.77 14.75 7.24

22.62 22.52 11.44

22.34 22.25 11.45

15.75 15.72 6.93

15.06 15.03 7.03

10.20 10.18 6.99

10.93 10.93 6.99

10.24 10.21 7.01

10.53 10.52 7.03

20.65 20.56 11.24

20.69 20.61 11.25

17.80 17.67 11.25

15.35 15.22 7.86

12.26 12.24 7.80

11.60 11.56 7.82

11.65 11.61 7.78

15.80 15.75 7.90

12.18 12.17 7.78

14.71 14.65 7.88

14.48 14.46 7.77

20.84 20.79 11.32

20.93 20.87 11.33

10.39 10.39 7.08

10.38 10.38 7.09

10.68 10.66 7.09

10.97 10.97 7.09

10.77 10.75 7.09

10.97 10.96 7.09

10.70 10.69 7.12
14.884 14.843 8.088

nder the Regional Haze Rule (EPA, 2003)

Dolly Sods Wilderness

Everglades National Park

trick Wilderness, Gates of the Mountains Wilderness, Bryce 

ger Wilderness, Weminuche Wilderness, North Absaroka 

a Garita Wilderness, Scapegoat Wilderness, Sawtooth 

Wilderness, Anaconda-Pintler Wilderness

Joshua Tree NM