International Day for the Preservation of the Ozone Layer

In a nutshell

International Day for the Preservation of the Ozone Layer (informally and simply called Ozone Day) is celebrated on September 16 designed by the United Nations General Assembly. This designation had been made on December 19, 2000, in commemoration of the date, in 1987, on which nations signed the Montreal Protocol on Substances that Deplete the Ozone Layer. In 1994, the UN General Assembly proclaimed 16 September the International Day for the Preservation of the Ozone Layer, commemorating the date of the signing, in 1987, of the Montreal Protocol on Substances that Deplete the Ozone Layer. The closure of the hole in the ozone layer was observed 30 years after the protocol was signed. Due to the nature of the gases responsible for ozone depletion their chemical effects are expected to continue for between 50 and 100 years.

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Through Montreal Protocol, Ozone layer and Ozone depletion

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Substance regulation and phase-out

Under the Montreal Protocol, parties commit to reducing the consumption and production of ozone-depleting substances (ODS). The treaty outlines a schedule for the phase-out of key substances such as CFCs, HCFCs, and halons. The Kigali Amendment to the Montreal Protocol, agreed upon in 2016, included provisions for the phase-down of HFCs, which are potent greenhouse gases but do not deplete the ozone layer.

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International Day for the Preservation of the Ozone Layer

Substance regulation and phase-out

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