Many refrigerants that are commonly used in refrigeration and air conditioning systems are ozone-depleting substances (ODSODSA compound that contributes to stratospheric ozone depletion. ODS include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons, methyl bromide, carbon tetrachloride, hydrobromofluorocarbons, chlorobromomethane, and methyl chloroform. ODS are generally very stable in the troposphere and only degrade under intense ultraviolet light in the stratosphere. When they break down, they release chlorine or bromine atoms, which then deplete ozone. A detailed list (http://www.epa.gov/ozone/science/ods/index.html) of class I and class II substances with their ODPs, GWPs, and CAS numbers are available.). Managing refrigerant emissions is an important strategy for addressing ozone layer depletion and protecting human health and the environment.

• Learn more about managing refrigerant emissions from stationary refrigeration and air conditioning systems here. Resources specific to managing refrigerant emissions from supermarket refrigeration systems are available through EPA’s GreenChill Program.
• Learn more about managing refrigerant emissions from motor vehicle air-conditioning systems.
• Learn more about preventing ODS emissions by recovering refrigerant from old refrigerators, freezers, window air conditioners, and dehumidifiers through EPA’s Responsible Appliance Disposal Program.