---
kind: "unit"
title: "42"
title_heading: "The Public Health and Welfare"
key: "ch85/schI/ptC"
level: "part"
label: "Part C"
heading: "Prevention of Significant Deterioration of Air Quality"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/42/ch85-schI-ptC"
sections_count: 12
---

# Part C — Prevention of Significant Deterioration of Air Quality

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

## Contents

- [Subpart i — clean air](/usc/42/ch85-schI-ptC-spti.md)
- [Subpart ii — visibility protection](/usc/42/ch85-schI-ptC-sptii.md)