International Day against Nuclear Tests

The Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) relies on innovation to enhance the capabilities of the Treaty's verification regime as well as to help move the Treaty closer to universalization and entry into force. As the eighth event in the CTBT: Science and Technology Conference series, SnT2025 will bring together well over 1500 scientists, technologists, academics, students, and delegates from the CTBTO's policy making organs Watch the CTBT: Science and Technology Conference 2025 (SnT205)! Meetings & Events

General and complete disarmament - Item 98: High-level meeting to commemorate and promote the International Day against Nuclear Tests. Watch the General Assembly: 91st plenary meeting, 79th session! General Assembly

Since nuclear weapons testing began 80 years ago, over 2,000 have taken place. On the International Day against Nuclear Tests (IDANT), the   United Nations Secretary-General antonio Guterres calls on all States to ratify the Comprehensive Nuclear-Test-Ban Treaty. Its entry into force is more urgent than ever. “Now is the time to silence the bombs before they speak again.”

2025 Conference on Facilitating the Entry into Force of the Comprehensive Nuclear-Test-Ban Treaty United Nations, New York;   The 14th Conference on Facilitating Entry into Force of the Comprehensive Nuclear-Test-Ban Treaty (Article XIV Conference) will take place at the United Nations in New York on Friday, 26 September 2025. Conference Material Draft Rules of Procedure (CTBT-Art.XIV/2025/1) English | Arabic | Chinese | French | Russian | Spanish Draft Provisional Agenda (CTBT-Art.XIV/2025/2) English | Arabic | Chinese | French | Russian | Spanish Information for participants: Note by the Secretariat (CTBT-Art.XIV-2025-INF.1) English Information for non-governmental organizations: Note by the Secretariat (CTBT-Art.XIV-2025-INF.2) English

As we observe the International Day against Nuclear Tests , we are also approaching another milestone. In 2026, we will mark 30 years since Comprehensive Nuclear Test-Ban Treaty was opened for signature . Anniversaries invite reflection, not only on what has been achieved but also on the work that lies ahead. Our Treaty has already had a profound impact. Nuclear test explosions have become extremely rare, and the verification regime operates with global reach and trust. We look forward to the day when Treaty enters into force, enabling all elements of the verification regime to be deployed. Achieving this will require the remaining States to take the final step . They have the opportunity to help complete what was started almost three decades ago. Their decision to ratify the Treaty would reinforce a commitment that has already proved its worth and support a system that benefits every region. This International Day is a reminder that the absence of nuclear test explosions is not a ma...

Today’s international climate is marked by heightened tensions and evolving geopolitical dynamics. However, the record leaves little room for doubt: testing has come to an almost complete halt, and States continue to support and use the verification system . This reflects a near-universal view that nuclear testing has no place in the twenty-first century . The International Day againts Nuclear Tests (IDANT) reminds us that change happens when people understand why it matters. Communities affected by past tests carry voices that deserve to be heard. Diplomats, scientists, educators and youth advocates help translate remembrance into prevention. Their work strengthens a culture of responsibility that maintains the silence we expect from test sites across the world.