---
kind: "unit"
title: "42"
title_heading: "The Public Health and Welfare"
key: "ch85/schI/ptD"
level: "part"
label: "Part D"
heading: "Plan Requirements for Nonattainment Areas"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/42/ch85-schI-ptD"
sections_count: 27
---

# Part D — Plan Requirements for Nonattainment Areas

Title 42 — The Public Health and Welfare › Chapter 85 — Air Pollution Prevention and Control › Subchapter I — Programs and Activities

## Contents

- [Subpart 1 — nonattainment areas in general](/usc/42/ch85-schI-ptD-spt1.md)
- [Subpart 2 — additional provisions for ozone nonattainment areas](/usc/42/ch85-schI-ptD-spt2.md)
- [Subpart 3 — additional provisions for carbon monoxide nonattainment areas](/usc/42/ch85-schI-ptD-spt3.md)
- [Subpart 4 — additional provisions for particulate matter nonattainment areas](/usc/42/ch85-schI-ptD-spt4.md)
- [Subpart 5 — additional provisions for areas designated nonattainment for sulfur oxides, nitrogen dioxide, or lead](/usc/42/ch85-schI-ptD-spt5.md)
- [Subpart 6 — savings provisions](/usc/42/ch85-schI-ptD-spt6.md)