U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
(a) Section 6.7 of Regulation 6.0 is disapproved since it could conflict with the preconstruction requirements for the prevention of significant deterioration (PSD) of air quality.
(b) Section 6.9 of Regulation 6.0 is disapproved since it could conflict with the preconstruction requirements for the prevention of significant deterioration (PSD) of air quality and the Administrator's Interpretative on Rule of December 21, 1976.