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Daily Data InsightsEmissions of substances that deplete the ozone layer have fallen by more than 99% since 1989

Emissions of substances that deplete the ozone layer have fallen by more than 99% since 1989

Graph titled 'Global emissions of ozone-depleting substances' showing the annual consumption of various ozone-depleting gases from 1986 to 2021, measured in ODP (ozone-depleting potential) tonnes. The stacked area graph indicates a peak around 1988 and a general decline thereafter. Each gas type is color-coded: CFCs, Halons, Carbon Tetrachloride, Methyl Chloroform, Methyl Bromide, and HCFCs. The data source is the UN Environment Programme (2023). A note explains that negative consumption values can occur when countries destroy or export gases that were produced in previous years, like stockpiles.

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.

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