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Ozone Day, also known as the International Day for the Preservation of the Ozone Layer, is observed annually on September 16th. This day marks the anniversary of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987, which is an international treaty designed to phase out the production and use of ozone-depleting substances (ODS). Ozone Day serves to raise awareness about the importance of protecting the ozone layer and the achievements made under the Montreal Protocol in mitigating ozone depletion and climate change.