---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchC/part61"
level: "part"
label: "Part 61"
heading: "National Emission Standards for Hazardous Air Pollutants"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchC-part61"
sections_count: 215
---

# Part 61 — National Emission Standards for Hazardous Air Pollutants

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter C — Air Programs

## Contents

- [Subpart A — General Provisions](/cfr/40/chI-subchC-part61-subpartA.md)
- [Subpart B — National Emission Standards for Radon Emissions From Underground Uranium Mines](/cfr/40/chI-subchC-part61-subpartB.md)
- [Subpart C — National Emission Standard for Beryllium](/cfr/40/chI-subchC-part61-subpartC.md)
- [Subpart D — National Emission Standard for Beryllium Rocket Motor Firing](/cfr/40/chI-subchC-part61-subpartD.md)
- [Subpart E — National Emission Standard for Mercury](/cfr/40/chI-subchC-part61-subpartE.md)
- [Subpart F — National Emission Standard for Vinyl Chloride](/cfr/40/chI-subchC-part61-subpartF.md)
- [Subpart G — Subpart G [Reserved]](/cfr/40/chI-subchC-part61-subpartG.md)
- [Subpart H — National Emission Standards for Emissions of Radionuclides Other Than Radon From Department of Energy Facilities](/cfr/40/chI-subchC-part61-subpartH.md)
- [Subpart I — National Emission Standards for Radionuclide Emissions From Federal Facilities Other Than Nuclear Regulatory Commission Licensees and Not Covered by Subpart H](/cfr/40/chI-subchC-part61-subpartI.md)
- [Subpart J — National Emission Standard for Equipment Leaks (Fugitive Emission Sources) of Benzene](/cfr/40/chI-subchC-part61-subpartJ.md)
- [Subpart K — National Emission Standards for Radionuclide Emissions From Elemental Phosphorus Plants](/cfr/40/chI-subchC-part61-subpartK.md)
- [Subpart L — National Emission Standard for Benzene Emissions from Coke By-Product Recovery Plants](/cfr/40/chI-subchC-part61-subpartL.md)
- [Subpart M — National Emission Standard for Asbestos](/cfr/40/chI-subchC-part61-subpartM.md)
- [Subpart N — National Emission Standard for Inorganic Arsenic Emissions From Glass Manufacturing Plants](/cfr/40/chI-subchC-part61-subpartN.md)
- [Subpart O — National Emission Standard for Inorganic Arsenic Emissions From Primary Copper Smelters](/cfr/40/chI-subchC-part61-subpartO.md)
- [Subpart P — National Emission Standard for Inorganic Arsenic Emissions From Arsenic Trioxide and Metallic Arsenic Production Facilities](/cfr/40/chI-subchC-part61-subpartP.md)
- [Subpart Q — National Emission Standards for Radon Emissions From Department of Energy Facilities](/cfr/40/chI-subchC-part61-subpartQ.md)
- [Subpart R — National Emission Standards for Radon Emissions From Phosphogypsum Stacks](/cfr/40/chI-subchC-part61-subpartR.md)
- [Subpart S — Subpart S [Reserved]](/cfr/40/chI-subchC-part61-subpartS.md)
- [Subpart T — National Emission Standards for Radon Emissions From the Disposal of Uranium Mill Tailings](/cfr/40/chI-subchC-part61-subpartT.md)
- [Subpart U — Subpart U [Reserved]](/cfr/40/chI-subchC-part61-subpartU.md)
- [Subpart V — National Emission Standard for Equipment Leaks (Fugitive Emission Sources)](/cfr/40/chI-subchC-part61-subpartV.md)
- [Subpart W — National Emission Standards for Radon Emissions From Operating Mill Tailings](/cfr/40/chI-subchC-part61-subpartW.md)
- [Subpart X — Subpart X [Reserved]](/cfr/40/chI-subchC-part61-subpartX.md)
- [Subpart Y — National Emission Standard for Benzene Emissions From Benzene Storage Vessels](/cfr/40/chI-subchC-part61-subpartY.md)
- [Subpart Z-AA — Subparts Z-AA [Reserved]](/cfr/40/chI-subchC-part61-subpartZ-AA.md)
- [Subpart BB — National Emission Standard for Benzene Emissions From Benzene Transfer Operations](/cfr/40/chI-subchC-part61-subpartBB.md)
- [Subpart CC-EE — Subparts CC-EE [Reserved]](/cfr/40/chI-subchC-part61-subpartCC-EE.md)
- [Subpart FF — National Emission Standard for Benzene Waste Operations](/cfr/40/chI-subchC-part61-subpartFF.md)