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

# Subpart UUUU — National Emission Standards for Hazardous Air Pollutants for Cellulose Products Manufacturing

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

- [§63.5480. What is the purpose of this subpart?](/cfr/40/63.5480.md)
- [§63.5485. Am I subject to this subpart?](/cfr/40/63.5485.md)
- [§63.5490. What parts of my plant does this subpart cover?](/cfr/40/63.5490.md)
- [§63.5495. When do I have to comply with this subpart?](/cfr/40/63.5495.md)
- [§63.5505. What emission limits, operating limits, and work practice standards must I meet?](/cfr/40/63.5505.md)
- [§63.5515. What are my general requirements for complying with this subpart?](/cfr/40/63.5515.md)
- [§63.5530. How do I demonstrate initial compliance with the emission limits and work practice standards?](/cfr/40/63.5530.md)
- [§63.5535. What performance tests and other procedures must I use?](/cfr/40/63.5535.md)
- [§63.5540. By what date must I conduct a performance test or other initial compliance demonstration?](/cfr/40/63.5540.md)
- [§63.5541. When must I conduct subsequent performance tests?](/cfr/40/63.5541.md)
- [§63.5545. What are my monitoring installation, operation, and maintenance requirements?](/cfr/40/63.5545.md)
- [§63.5555. How do I demonstrate continuous compliance with the emission limits, operating limits, and work practice standards?](/cfr/40/63.5555.md)
- [§63.5560. How do I monitor and collect data to demonstrate continuous compliance?](/cfr/40/63.5560.md)
- [§63.5575. What notifications must I submit and when?](/cfr/40/63.5575.md)
- [§63.5580. What reports must I submit and when?](/cfr/40/63.5580.md)
- [§63.5585. What records must I keep?](/cfr/40/63.5585.md)
- [§63.5590. In what form and how long must I keep my records?](/cfr/40/63.5590.md)
- [§63.5595. What compliance options do I have if part of my affected source is subject to both this subpart and another subpart?](/cfr/40/63.5595.md)
- [§63.5600. What other requirements apply to me?](/cfr/40/63.5600.md)
- [§63.5605. Who implements and enforces this subpart?](/cfr/40/63.5605.md)
- [§63.5610. What definitions apply to this subpart?](/cfr/40/63.5610.md)