World Ozone Day 2025

• Every year on September 16, the International Day for the Preservation of the Ozone Layer or World Ozone Day is observed.

• The theme of World Ozone Day 2025 is "From science to global action".

• In 1994, the United Nations General Assembly declared September 16 as the International Day for the Preservation of the Ozone Layer.

• The day is observed to commemorate the anniversary of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987.

• In the history of the United Nations, the Vienna Convention and the Montreal Protocol were the first treaties to receive universal ratification on September 16, 2009.