This action lists four substitutes for ozone-depleting substances (ODSs) in the fire suppression and explosion protection sector as acceptable subject to use conditions under the U.S. Environmental Protection Agency's (EPA) Significant New Alternatives Policy (SNAP) program. SNAP implements section 612 of the Clean Air Act, as amended in 1990, which requires EPA to evaluate substitutes for ODSs and find them acceptable where they do not pose a greater overall risk to human health and the environment than other acceptable substitutes.