Special Issue on the International Day for the Preservation of the Ozone Layer 16 September 2023 - The United Nations Secretary-General António Guterres’ message on the International Day for the Preservation of the Ozone Layer, observed 16 September 2023 - Montreal Protocol: fixing the ozone layer and reducing climate change, Ozone Secretariat - Message from Inger Andersen, UNEP Executive director for World Ozone Day 2023 - Letter from the Head of UNEP OzonAction to National Ozone Officers for World Ozone Day 2023 - The International Ozone Commission, on the 36th anniversary of the Montreal Protocol, reports successes and new milestones for progressing toward ozone layer recovery