CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 51—REQUIREMENTS FOR PREPARATION, ADOPTION, AND SUBMITTAL OF IMPLEMENTATION PLANS > SUBPART X—Provisions for Implementation of 8-hour Ozone National Ambient Air Quality Standard (§51.900 to §51.918) > 51.914—What new source review requirements apply for 8-hour ozone nonattainment areas?