International Day for the Preservation of the Ozone Layer 2026

International Day for the Preservation of the Ozone Layer is observed each year on September 16 to celebrate one of our planet’s greatest environmental victories – and to reinforce the urgent work still needed to protect this fragile shield. It’s a moment to reflect on the success of global collaboration, honor the science that guided action, and commit to safeguarding the ozone layer for future generations.

What is International Day for the Preservation of the Ozone Layer?

This annual observance was proclaimed by the United Nations General Assembly in 1994 to mark the anniversary of the signing of the Montreal Protocol on September 16, 1987. The Protocol is a historic treaty designed to phase out substances that deplete the ozone layer, such as CFCs, HCFCs, and halons.

Often referred to simply as “Ozone Day,” this day invites governments, industries, educators, scientists, and individuals to highlight the vital role the ozone layer plays in preserving life on Earth, protecting both human health and ecosystems from harmful ultraviolet radiation.

When is International Day for the Preservation of the Ozone Layer?

The observance falls each year on September 16. In 2026, it will again be marked with events and campaigns worldwide, though its impact extends far beyond a single day through policymaking, scientific collaboration, and public education.

UN member states and environmental groups often organize themed events – for example, lighting up landmarks, hosting educational workshops, and sharing social media campaigns under hashtags like #OzoneDay and #MontrealProtocol.

Why International Day for the Preservation of the Ozone Layer Matters

The ozone layer is a fragile buffer in the stratosphere that absorbs most of the sun’s harmful ultraviolet (UV) radiation. Without it, Earth would face drastically increased rates of skin cancer, cataracts, immune suppression, and damage to crops, marine life, and ecosystems.

This day reminds us what is possible when the world works together. The Montreal Protocol is one of the most successful environmental agreements in history. It has helped significantly reduce ozone-depleting substances and slowed the growth of the ozone hole over Antarctica. Thanks to this treaty, the ozone layer is on track to recover within this century.

Moreover, the Protocol has evolved to bring climate benefits. The Kigali Amendment, adopted in 2016, targets hydrofluorocarbons (HFCs) – powerful greenhouse gases used in refrigeration and air conditioning. By phasing down HFCs, the amendment is expected to prevent up to 0.5°C of global warming by the end of the century.

History of International Day for the Preservation of the Ozone Layer

Concern about ozone depletion first gained attention in the 1970s, when scientists discovered that human-made chemicals – especially chlorofluorocarbons (CFCs) – were rising into the stratosphere and breaking apart ozone molecules. In 1985, the discovery of a massive seasonal ozone hole over Antarctica made headlines worldwide.

That same year, countries adopted the Vienna Convention for the Protection of the Ozone Layer. Two years later, they signed the Montreal Protocol, committing to phase out the production and use of ozone-depleting substances. The Protocol is legally binding, flexible, and universally ratified – a rare feat in international law.

In 1994, the United Nations designated September 16 as the International Day for the Preservation of the Ozone Layer. The date commemorates the signing of the Montreal Protocol and celebrates the ongoing global effort to heal the sky.

How to Get Involved in International Day for the Preservation of the Ozone Layer

• Raise awareness: Share facts about ozone protection on social media using hashtags like #OzoneDay and #MontrealProtocol.
• Learn and teach: Organize a classroom activity, workshop, or seminar about the ozone layer and how it connects to climate change.
• Support sustainable cooling: Choose air conditioners and refrigerators that use climate-friendly refrigerants and are energy efficient.
• Follow the science: Read updates from the United Nations Environment Programme (UNEP) and the World Meteorological Organization (WMO) on ozone recovery and atmospheric trends.
• Celebrate success: Highlight how international cooperation and science-based policy have made a measurable difference.
• Advocate for bold action: Call on leaders to continue supporting ozone protection and to integrate climate and environmental goals.

Noteworthy Facts About the Ozone Layer and Its Protection

• The Montreal Protocol is the only UN treaty to have achieved universal ratification – signed by all 198 UN member states.
• Thanks to the Protocol, nearly 99 percent of ozone-depleting substances have been phased out globally.
• The ozone layer is expected to recover to 1980 levels by around 2066 in Antarctica, 2045 in the Arctic, and 2040 in most of the world.
• The Kigali Amendment aims to cut HFC use by more than 80 percent by 2047, helping to reduce climate change.
• Protecting the ozone layer also protects biodiversity, agriculture, and public health from harmful ultraviolet radiation.

Hashtags

#OzoneDay, #SaveOzone, #MontrealProtocol, #ClimateAction

Links

• UN – International Day for the Preservation of the Ozone Layer
• UNEP – Ozone Secretariat
• Learn about the Montreal Protocol