Mandatory Federal Class I Areas
Bingham D. Mandatory Federal Class I Areas. NPS Air Resources Division
Mandatory Federal Class I areas (NPS, USFS, FWS and BIA) as defined by the Clean Air Act of 1977. Class I areas consist of national parks larger than 6,000 acres and national wilderness areas larger than 5,000 acres, in existence on August 7, 1977.
- Type
- Geospatial Dataset
- Authors
- Bingham, Drew
- Publisher
- NPS Air Resources Division
- Units
- ARD
- Keywords
- Air, Air Resources Division, ARD, Boundaries, Class I, Clean Air Act, PSD, regional haze, United States, Visibility