Emissions of Substances that Deplete the Ozone Layer have Fallen Dramatically

In 1987, countries around the world signed the Montreal Protocol to reduce emissions of ozone-depleting substances — such as chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and halon gases used in refrigerators, deodorants, and other industrial processes.

This chart shows that since the Montreal agreement entered into force in 1989, global emissions of ozone-depleting substances have fallen by more than 99% as manufacturers have substituted them for less harmful alternatives.

The Montreal Protocol is one of the most successful international agreements to date.