This day was established in memory of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer, and has been celebrated since 1995.
Scientific confirmation of the destruction of the ozone layer has prompted the international community to create a mechanism of cooperation to take measures to protect the ozone layer. This was enshrined in the Vienna Convention on the Protection of the Ozone Layer, which was adopted and signed by 28 countries on March 22, 1985. In September 1987, this led to the drafting of the Montreal Protocol on Substances that Deplete the Ozone Layer.
The Montreal Protocol regulates almost 100 chemicals in several categories. For each group of chemicals or annex, the Treaty establishes a schedule for phasing out production and consumption in order to eventually completely abandon them. The Montreal Protocol establishes a schedule for the consumption of ozone-depleting substances. Consumption is defined as the amount produced plus imports minus exports in any given year. There is also a practice of withholding funds for the destruction of declared stocks.
On September 16, 2009, the Vienna Convention and the Montreal Protocol became the first treaties in the history of the United Nations to receive universal ratification.