In the mid-1970s, it was discovered that some human-produced chemicals could lead to depletion of the ozone layer. Following the discovery of this environmental issue, researchers sought a better understanding of this threat to the ozone layer. The work of many scientists throughout the world has provided a basis for building a solid scientific understanding of the ozone depletion process.
Ozone layer depletion could have serious effects on human health and the environment.
The production and consumption of ozone-depleting substances (ODSs) are controlled under a 1987 international agreement known as the “Montreal Protocol on Substances that Deplete the Ozone Layer” and by its subsequent amendments and adjustments. As a result of the Montreal Protocol, the overall abundance of ODSs in the atmosphere has been decreasing. Overall, the ozone hole has shown signs of healing since 2000, which is predominantly attributable to phasing out ODSs.
To commemorate the date when the Montreal Protocol was signed on 16 September 1987, and in recognising the importance of global efforts to protect the Ozone Layer, on 19 December 1994, the United Nations General Assembly proclaimed 16 September to be the International Day for the Preservation of the Ozone Layer. The day was first celebrated in 1995.
The aim of the Montreal Protocol is to protect the ozone layer by taking measures to control global production and consumption of substances that deplete the ozone layer.
The 2022 theme for the International Day for the Preservation of the Ozone Layer is Montreal Protocol@35: global cooperation protecting life on earth.
The theme recognises the wider impact the Montreal Protocol has on climate change and the need to act in collaboration, forge partnerships and develop global cooperation to address climate challenges and protect life on earth for future generations.
On 16 September 2022, organisations and communities are encouraged to host different educational and promotional activities, including seminars, lectures, conferences, forums, and social media campaigns, to raise and spread awareness of ozone depletion and the importance of ozone layer preservation.