---
kind: "unit"
title: "24"
title_heading: "Housing and Urban Development"
key: "subtA/part51"
level: "part"
label: "Part 51"
heading: "Environmental Criteria and Standards"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/24/subtA-part51"
sections_count: 26
---

# Part 51 — Environmental Criteria and Standards

Title 24 C.F.R. — Housing and Urban Development › Subtitle A — Office of the Secretary, Department of Housing and Urban Development

## Contents

- [Subpart A — General Provisions](/cfr/24/subtA-part51-subpartA.md)
- [Subpart B — Noise Abatement and Control](/cfr/24/subtA-part51-subpartB.md)
- [Subpart C — Siting of HUD-Assisted Projects Near Hazardous Operations Handling Conventional Fuels or Chemicals of an Explosive or Flammable Nature](/cfr/24/subtA-part51-subpartC.md)
- [Subpart D — Siting of HUD Assisted Projects in Runway Clear Zones at Civil Airports and Clear Zones and Accident Potential Zones at Military Airfields](/cfr/24/subtA-part51-subpartD.md)