Under Section 612 of the Clean Air Act (CAA), EPA’s Significant New Alternatives Policy (SNAP) program reviews substitutes within a comparative risk framework. The SNAP program evolves the list of alternatives as the EPA makes decisions informed by its overall understanding of the environmental and human health impacts as well as its current knowledge about available substitutes.
The President’s Climate Action Plan calls on EPA to use its authority under the Significant New Alternatives Policy (SNAP) program to encourage private sector investment in low-emissions technology by identifying and approving climate-friendly chemicals while prohibiting certain uses of the most harmful chemical alternatives. Read more about the Climate Action Plan and SNAP’s latest actions.
EPA has developed materials and products for the federal sector, including an Excel-based HFC Emissions Accounting Tool to support federal agencies in calculating and reporting their HFC emissions. Find the tool and other resources for agencies on the Federal Sector page.
Manufacturers, formulators, and end-users can submit their proposed substitute under the SNAP program. Submission forms and details can be found in the Submit a Substitute section.
Significant New Alternatives Policy (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.