40 CFR § 80.1602
Applicability
June 9, 2020
(a) The provisions of this subpart O shall apply beginning January 1, 2017, unless otherwise provided.
(b) The standards and requirements for gasoline sulfur under subpart H of this part shall continue to apply until the gasoline produced or imported by any refiner or importer is required to comply with the standards and requirements under this subpart O.