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| RANK |
VISIBILITY |
1
2
3
4
5
6
7
8
9
10
11
12
13 |
Mammoth Cave National Park
Great Smoky Mountains National Park
Shenandoah National Park
Sequoia-Kings Canyon National Parks
Acadia National Park
Yosemite National Park
Glacier National Park
Big Bend National Park
Rocky Mountain National Park
Mesa Verde National Park
Yellowstone National Park
Grand Canyon National Park
Great Basin National Park |
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| RANK OZONE |
1
2
3
4
5
6
7
8
9
10
11
12
13 |
Sequoia-Kings Canyon National Parks
Great Smoky Mountains National Park
Acadia National Park
Shenandoah National Park
Mammoth Cave National Park
Yosemite National Park
Rocky Mountain National Park
Grand Canyon National Park
Great Basin National Park
Mesa Verde National Park
Yellowstone National Park
Big Bend National Park
Glacier National Park |
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| RANK ACID PRECIPITATION |
1
2
3
4
5
6
7
8
9
10
11
12
13 |
Mammoth Cave National Park
Great Smoky Mountains National Park
Shenandoah National Park
Acadia National Park
Rocky Mountain National Park
Great Basin National Park
Yosemite National Park
Mesa Verde National Park
Sequoia-Kings Canyon National Parks
Big Bend National Park
Grand Canyon National Park
Glacier National Park
Yellowstone National Park |
Rankings indicate most polluted to least polluted for parks included in this report.
*See Charts of Measurements and Methodology for Code Red Rankings
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