{"data":{"id":"us/40-cfr-85.2303","jurisdiction":"us","citation":"40 CFR 85.2303","heading":"Duration of model year.","body":"A specific model year must always include January 1 of the calendar year for which it is designated and may not include a January 1 of any other calendar year. Thus, the maximum duration of a model year is one calendar year plus 364 days.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 85—CONTROL OF AIR POLLUTION FROM MOBILE SOURCES","Subpart X—Determination of Model Year for Motor Vehicles and Engines Used in Motor Vehicles Under Section 177 and Part A of Title II of the Clean Air Act"],"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":"791941bff339b571747e01bbe03cbe94631543ae4cb2ddc1600e875a4a041416","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-85.2302","next":"us/40-cfr-85.2304"},"notice":"GroundRules: Original legal text. Not legal advice."}