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Lands designated as Class I Areas under the Clean Air Act Amendments of 1977 are afforded the highest level of protection from air pollutants in the nation. These lands consist of national wildernesses (Forest Service), parks (National Park Service) and wildlife refuges (U.S. Fish & Wildlife Service) in existence at the time the amendment was passed. All other lands in the nation are designated as Class II. The Forest Service currently manages 88 Class I Areas, totaling 15,681,542 acres. To find out more about a particular Class I Area, click on the state you are interested in, or click here for the alphabetical area listing. |

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Map Key:
Class I Wilderness Areas
Class II Wilderness Areas
National Forests
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