CFR›Title 40›Chapter I›Part 63›Subpart AAAA›Subject Group Other Requirements and Information ContainsSections 63.1985–63.1990; Appendix Table 1 to Subpart AAAA of Part 63CorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Contents 63.1985 § 63.1985 Who enforces this subpart? 63.1990 § 63.1990 What definitions apply to this subpart? Table 1 to Subpart AAAA of Part 63 Table 1 to Subpart AAAA of Part 63—Applicability of NESHAP General Provisions to Subpart AAAA Previous Notifications, Records, and Reports Notifications, Records, and Reports Next Standards Standards