International Day for the Preservation of the Ozone Layer – 16th September 2025
This is a key environmental day in history of when, in 1987, the the Montreal Protocol on Substances that Deplete the Ozone Layer was adopted.
‘As the treaty turns 35 on Ozone Day, we will remember how the Montreal Protocol ended one of the biggest threats ever to face humanity as a whole: the depletion of the ozone layer. When the world found out that ozone-depleting gases used in aerosols and cooling were creating a hole in the sky, they came together. They showed that multilateralism and effective global cooperation worked and they phased out these gases. Now the ozone layer is healing, allowing it once again to shield humanity from the sun’s ultraviolet radiation.’
If you’d like a list of environmental awareness days and sustainability awareness days for the UK, here’s the full list
