New York, The United Nations commemorated World Ozone Day by celebrating decades of global cooperation that have led to the healing of the ozone layer, Earth’s protective shield against harmful ultraviolet radiation.

UN Secretary General António Guterres praised the success of the Vienna Convention and the Montreal Protocol, calling them “landmarks of multilateral action.” These agreements led to the near-total elimination of ozone-depleting substances like chlorofluorocarbons (CFCs), once common in air conditioners and aerosol sprays.

In a video message, UNEP Executive Director Inger Andersen highlighted that the ozone hole is now closing, thanks to coordinated global efforts. She called the achievement “multilateralism at its very best.”

Guterres urged nations to ratify and implement the Kigali Amendment, which targets hydrofluorocarbons (HFCs) potent greenhouse gases used in cooling technologies. Full implementation could prevent up to 0.5°C of global warming by century’s end.

The UN emphasized that the ozone layer’s recovery is proof that science-guided action can deliver real progress. As climate threats grow, the message was clear: protecting the planet demands unity, urgency, and continued commitment.