Emissions of Substitutes for Ozone-depleting Substances

Hydrofluorocarbons (HFCs), Perfluorocarbons (PFCs), and Sulphur hexafluoride (SF6) are emitted from a number of end use sectors in which they substitute for ozone-depleting substances. These include refrigeration, air conditioning, aerosol applications, fire suppression, foam blowing, sterilants, and solvents. Emissions of these gases may occur within a year of sale or gradually over several years depending on the application. Aerosols, open-cell foam blowing, and solvents are typical sectors where the chemical is rapidly emitted, while these emissions may be delayed for decades in refrigeration, fire suppression and closed-cell foam blowing. Recovery, recycling and destruction can further delay or eliminate the release of these gases into the atmosphere.