---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part52/subpartFFF"
level: "subpart"
label: "Subpart FFF"
heading: "Commonwealth of the Northern Mariana Islands"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part52-subpartFFF"
sections_count: 5
---

# Subpart FFF — Commonwealth of the Northern Mariana Islands

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter C — Air Programs › Part 52 — Approval and Promulgation of Implementation Plans

## Sections

- [§52.2900. Negative declaration.](/cfr/40/52.2900.md)
- [§52.2920. Identification of plan.](/cfr/40/52.2920.md)
- [§52.2921. Original identification of plan.](/cfr/40/52.2921.md)
- [§52.2922. Significant deterioration of air quality.](/cfr/40/52.2922.md)
- [§52.2923-52.2999. Reserved](/cfr/40/52.2923-52.2999.md)