CFR›Title 40›Chapter I›Part 97›Subpart A ContainsSections 97.1–97.7CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Subpart A—NOX Budget Trading Program General Provisions Sections 97.1 § 97.1 Purpose. 97.2 § 97.2 Definitions. 97.3 § 97.3 Measurements, abbreviations, and acronyms. 97.4 § 97.4 Applicability. 97.5 § 97.5 Retired unit exemption. 97.6 § 97.6 Standard requirements. 97.7 § 97.7 Computation of time. Next AA Subpart AA—CAIR NO<sub>X</sub> Annual Trading Program General Provisions