Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Chemicals and Toxics
    • Climate Change
    • Emergency Response
    • Environmental Information by Location
    • Environmental Justice
    • Greener Living
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Pesticides
    • Radon
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Guidance
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • EPA Administrator
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History
    • Staff Directory
Contact Us

Significant New Alternatives Policy (SNAP) Program

  • 2020 Ozone Layer Protection Milestones

    Explore how successful ozone layer protection is a part of our everyday life.

  • Submit a Substitute

    Learn how manufacturers, formulators, and end-users can submit their proposed substitutes for ozone-depleting substances.

SNAP was established under Section 612 of the Clean Air Act to identify and evaluate substitutes for ozone-depleting substances.  The program looks at overall risks to human health and the environment of existing and new substitutes, publishes lists and promotes the use of acceptable substances, and provides the public with information. Learn more about the SNAP program.

Class I Substance: one of several groups of chemicals with an ozone-depletion potential of 0.2 or higher

Class I substances listed in the Clean Air Act (CAA) include CFCs, halons, carbon tetrachloride, and methyl chloroform. EPA later added HBFCs and methyl bromide to the list by regulation. A table of class I substances shows their lifetime ODPs, GWPs, and CAS numbers.

Class II Substance: a chemical with an ozone-depletion potential of less than 0.2

Currently, all of the HCFCs are class II substances. Lists of class II substances with their ODPs, GWPs, and CAS numbers are available.

About The Program

  • Overview of SNAP
  • SNAP Glossary

Resources

  • Questions and Answers About Alternatives in Each Sector
  • Global Emissions of Substitutes for Ozone-Depleting Substances
  • Ozone Layer Protection
  • Global Warming Potentials in IPCC Fourth Assessment Report

SNAP Decisions

  • Acceptable & Unacceptable Substitutes
  • Rules & Notices

Submit a Substitute

  • Learn How to Submit
  • Instruction Manual
  • SNAP Application Form
  • TSCA/SNAP Addendum

Substitutes by Industrial Sector

  • Adhesives, Coatings, and Inks
  • Aerosols
  • Cleaning Solvents
  • Fire Suppression and Explosion Protection
  • Foam Blowing Agents
  • Refrigeration and Air Conditioning
  • Sterilants
  • Tobacco Expansion

Information About the American Innovation and Manufacturing (AIM) Act of 2020

  • New web area: Protecting Our Climate by Reducing Use of HFCs.

What's New

EPA publishes proposed rule expanding the list of substitutes for refrigeration and air conditioning (5/24/2023)

EPA publishes final rule expanding the list of substitutes for refrigeration and air conditioning and fire suppression (4/28/2023)

EPA publishes final rule expanding the list of substitutes for motor vehicle air conditioning (5/4/2022)

If you are sending a submission which contains CBI, please send an email in advance to ensure we receive your CBI submission to: TAPANI.HOLLY@EPA.GOV 
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on May 24, 2023
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data.gov
  • Inspector General
  • Jobs
  • Newsroom
  • Open Government
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions

Follow.