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Tribal Assessment The Colorado Plateau Small white dots are IMPROVE and IMPROVE protocol monitoring sites The Colorado Plateau region contains the following class I areas: Arches National Park Black Canyon of the Gunnison Wilderness Area Bryce Canyon National Park Canyonlands National Park Capitol Reef National Park Grand Canyon National Park Mesa Verde National Park Mount Baldy Wilderness Area Petrified Forest National Park Sycamore Canyon Wilderness Area Zion National Park