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World Ozone Day 2025 - September 16
September 22 , 2025
42 days
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- This day commemorating the Montreal Protocol, an environmental agreement that was signed in 1987.
- On September 16, 2009, the Vienna Convention and the Montreal Protocol became the first treaties in the history of the United Nations to achieve universal ratification.
- The protocol regulates the production and consumption of nearly 100 man-made chemicals referred to as ozone-depleting substances (ODS).
- The theme for this year's is "From science to global action"
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