On the 16th of September 1987 all United Nations member states, as well ass Niue, the Cork Islands, the Holy See and the European Union, met at the Montreal Protocol to take action against the depletion of the Ozone Layer. The states which signed the treaty committed to stop using substances which deteriorate the Ozone layer. A few years later, in 1994, the United Nations General Assembly proclaimed 16th September the International Day for the Preservation of the Ozone Layer.
The purpose of having an International Day for the Preservation of the Ozone layer is to spread awareness of the depletion of the Ozone Layer and search for solutions to preserve it. Even though the International Day for the Preservation of the Ozone Layer is a global observance day and not a public holiday, the day is celebrated throughout the world by promoting Ozone-friendly products, events which aim to raise awareness of the problem and how we can all do something to help, and by awarding those who worked hard to protect the Earth’s Ozone layer.
You can celebrate the day too, by avoiding things which deteriorate the Ozone layer. For example, choose to walk or cycle instead of driving that day, or at least try to use public transportation (which pollutes less than personal vehicles). But don’t forget – the best thing you could do is try to protect the Ozone layer every day, not only one day per year.