---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part52/subpartQQ"
level: "subpart"
label: "Subpart QQ"
heading: "South Dakota"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part52-subpartQQ"
sections_count: 14
---

# Subpart QQ — South Dakota

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

- [§52.2170. Identification of plan.](/cfr/40/52.2170.md)
- [§52.2171. Classification of regions.](/cfr/40/52.2171.md)
- [§52.2172. Approval status.](/cfr/40/52.2172.md)
- [§52.2173. Legal authority.](/cfr/40/52.2173.md)
- [§52.2174-52.2177. Reserved](/cfr/40/52.2174-52.2177.md)
- [§52.2178. Significant deterioration of air quality.](/cfr/40/52.2178.md)
- [§52.2179. Visibility protection.](/cfr/40/52.2179.md)
- [§52.2180. Stack height regulations.](/cfr/40/52.2180.md)
- [§52.2181. Reserved](/cfr/40/52.2181.md)
- [§52.2182. PM 10 Committal SIP.](/cfr/40/52.2182.md)
- [§52.2183. Variance provision.](/cfr/40/52.2183.md)
- [§52.2184. Operating permits for minor sources.](/cfr/40/52.2184.md)
- [§52.2185. Change to approved plan.](/cfr/40/52.2185.md)
- [§52.2186. Original identification of plan section.](/cfr/40/52.2186.md)