{"data":{"id":"us/40-cfr-81.411","jurisdiction":"us","citation":"40 CFR 81.411","heading":"Kentucky.","body":"Area name Acreage Public Law establishing Federal land manager\nMammoth Cave NP 51,303 69-283 USDI-NPS","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES","Subpart D—Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"26a650d33ba36df7f61cb6d202c73b98bd9e2f560a9ba6dc974b0dbfe4ff76fc","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-81.410","next":"us/40-cfr-81.412"},"notice":"GroundRules: Original legal text. Not legal advice."}