{"data":{"id":"us/40-cfr-97.81","jurisdiction":"us","citation":"40 CFR 97.81","heading":"General.","body":"Except otherwise as provided in this part, a NOX Budget opt-in unit shall be treated as a NOX Budget unit for purposes of applying subparts A through H of this part.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 97—FEDERAL NOX BUDGET TRADING PROGRAM, CAIR NOX AND SO2 TRADING PROGRAMS, CSAPR NOX AND SO2 TRADING PROGRAMS, AND TEXAS SO2 TRADING PROGRAM","Subpart I—Individual Unit Opt-ins"],"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":"91fa9255f5fe010b03fe60980d4871948e9f67d459d8b203856983420ea89398","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-97.80","next":"us/40-cfr-97.82"},"notice":"GroundRules: Original legal text. Not legal advice."}