---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part51/subpartCC"
level: "subpart"
label: "Subpart CC"
heading: "Provisions for Implementation of the 2015 Ozone National Ambient Air Quality Standards"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part51-subpartCC"
sections_count: 19
---

# Subpart CC — Provisions for Implementation of the 2015 Ozone National Ambient Air Quality Standards

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter C — Air Programs › Part 51 — Requirements for Preparation, Adoption, and Submittal of Implementation Plans

## Sections

- [§51.1300. Definitions.](/cfr/40/51.1300.md)
- [§51.1301. Applicability of this part.](/cfr/40/51.1301.md)
- [§51.1302. Classification and nonattainment area planning provisions.](/cfr/40/51.1302.md)
- [§51.1303. Application of classification and attainment date provisions in CAA section 181 to areas subject to § 51.1302.](/cfr/40/51.1303.md)
- [§51.1304-51.1305. Reserved](/cfr/40/51.1304-51.1305.md)
- [§51.1306. Redesignation to nonattainment following initial designations.](/cfr/40/51.1306.md)
- [§51.1307. Determining eligibility for 1-year attainment date extensions for an 8-hour ozone NAAQS under CAA section 181(a)(5).](/cfr/40/51.1307.md)
- [§51.1308. Modeling and attainment demonstration requirements.](/cfr/40/51.1308.md)
- [§51.1309. Reserved](/cfr/40/51.1309.md)
- [§51.1310. Requirements for reasonable further progress (RFP).](/cfr/40/51.1310.md)
- [§51.1311. Reserved](/cfr/40/51.1311.md)
- [§51.1312. Requirements for reasonably available control technology (RACT) and reasonably available control measures (RACM).](/cfr/40/51.1312.md)
- [§51.1313. Section 182(f) NO X exemption provisions.](/cfr/40/51.1313.md)
- [§51.1314. New source review requirements.](/cfr/40/51.1314.md)
- [§51.1315. Emissions inventory requirements.](/cfr/40/51.1315.md)
- [§51.1316. Requirements for an Ozone Transport Region.](/cfr/40/51.1316.md)
- [§51.1317. Fee programs for Severe and Extreme nonattainment areas that fail to attain.](/cfr/40/51.1317.md)
- [§51.1318. Suspension of SIP planning requirements in nonattainment areas that have air quality data that meet an ozone NAAQS.](/cfr/40/51.1318.md)
- [§51.1319. Reserved](/cfr/40/51.1319.md)