---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part63/subpartYYYY"
level: "subpart"
label: "Subpart YYYY"
heading: "National Emission Standards for Hazardous Air Pollutants for Stationary Combustion Turbines"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part63-subpartYYYY"
sections_count: 21
---

# Subpart YYYY — National Emission Standards for Hazardous Air Pollutants for Stationary Combustion Turbines

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter C — Air Programs › Part 63 — National Emission Standards for Hazardous Air Pollutants for Source Categories

## Sections

- [§63.6080. What is the purpose of subpart YYYY?](/cfr/40/63.6080.md)
- [§63.6085. Am I subject to this subpart?](/cfr/40/63.6085.md)
- [§63.6090. What parts of my plant does this subpart cover?](/cfr/40/63.6090.md)
- [§63.6092. Are duct burners and waste heat recovery units covered by subpart YYYY?](/cfr/40/63.6092.md)
- [§63.6095. When do I have to comply with this subpart?](/cfr/40/63.6095.md)
- [§63.6100. What emission and operating limitations must I meet?](/cfr/40/63.6100.md)
- [§63.6105. What are my general requirements for complying with this subpart?](/cfr/40/63.6105.md)
- [§63.6110. By what date must I conduct the initial performance tests or other initial compliance demonstrations?](/cfr/40/63.6110.md)
- [§63.6115. When must I conduct subsequent performance tests?](/cfr/40/63.6115.md)
- [§63.6120. What performance tests and other procedures must I use?](/cfr/40/63.6120.md)
- [§63.6125. What are my monitor installation, operation, and maintenance requirements?](/cfr/40/63.6125.md)
- [§63.6130. How do I demonstrate initial compliance with the emission and operating limitations?](/cfr/40/63.6130.md)
- [§63.6135. How do I monitor and collect data to demonstrate continuous compliance?](/cfr/40/63.6135.md)
- [§63.6140. How do I demonstrate continuous compliance with the emission and operating limitations?](/cfr/40/63.6140.md)
- [§63.6145. What notifications must I submit and when?](/cfr/40/63.6145.md)
- [§63.6150. What reports must I submit and when?](/cfr/40/63.6150.md)
- [§63.6155. What records must I keep?](/cfr/40/63.6155.md)
- [§63.6160. In what form and how long must I keep my records?](/cfr/40/63.6160.md)
- [§63.6165. What parts of the General Provisions apply to me?](/cfr/40/63.6165.md)
- [§63.6170. Who implements and enforces this subpart?](/cfr/40/63.6170.md)
- [§63.6175. What definitions apply to this subpart?](/cfr/40/63.6175.md)