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The largest Antarctic ozone hole recorded (September 1985) 2012 retrospective video by NASA on the Montreal Protocol. The Montreal Protocol on Substances That Deplete the Ozone Layer [2] is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion ...
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. [3] The closure of the hole in the ozone layer was observed 30 years after the protocol was signed. [4]
Antarctic total column ozone in September and October have continued to be 40–50 percent lower than pre-ozone-hole values since the 1990s. [1] A gradual trend toward "healing" was reported in 2016. [24] In 2017, NASA announced that the ozone hole was the weakest since 1988 because of warm stratospheric conditions.
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FILE - In this NASA false-color image, the blue and purple shows the hole in Earth's protective ozone layer over Antarctica on Oct. 5, 2022. Earth’s protective ozone layer is slowly but ...
The Montreal Protocol was signed in 1987 by the 20 major CFC producers and came into effect in 1989; since 1987, all 197 member states of the United Nations, among others, have ratified the Protocol. HFCs have since largely replaced CFCs. [11] An HFC refrigerant. Although HFCs are harmless to the ozone layer, they are potent greenhouse gases. [12]
The Ozone Secretariat functions as an administrator of the COP, Montreal Meeting of Parties (MOP), and Open-Ended Working Groups that help facilitate functions under the convention. [7] A Multilateral Fund exists to aid developing nations transition from ozone-depleting chemicals using guidelines under the convention, which is administered by a ...