International Day against Nuclear Tests
A/RES/64/35
A/RES/64/35
This authority record treats the observance as a fixed annual date. The same month and day can be reused unless a stronger source changes the rule. Public-holiday or government status is never inferred from the observance name alone.
Overview
The International Day against Nuclear Tests is observed on 29 August to raise awareness of the human, environmental and security consequences of nuclear-weapon test explosions and the case for ending nuclear testing.
The observance belongs to the UN disarmament and non-proliferation framework. It can explain historical testing, treaty architecture and victim impacts, but it should not provide technical details that would enable weapons development or testing.
Why it matters
The day connects remembrance and public education with the broader international effort to stop nuclear tests. Its scope is narrower than the International Day for the Total Elimination of Nuclear Weapons, which addresses nuclear weapons as a whole rather than testing specifically.
Responsible observance content should center affected communities, documented environmental and health consequences, arms-control history and current institutional processes without sensationalizing nuclear harm.
History
In 2009, Kazakhstan proposed an international day against nuclear tests. The UN General Assembly unanimously adopted resolution 64/35 on 2 December 2009 and proclaimed 29 August as the annual observance.
The date commemorates 29 August 1991, when the Semipalatinsk nuclear test site in Kazakhstan was closed. The first observance took place in 2010.
How the observance developed
This timeline is assembled only from verified provenance fields. Missing stages are omitted rather than inferred.
Kazakhstan
In 2009, Kazakhstan proposed an international day against nuclear tests.
United Nations General Assembly
UN General Assembly resolution 64/35
First documented observance
The first observance took place in 2010.
What the evidence establishes
Verified institutional roles and milestones are shown first. Fields that the reviewed sources do not establish remain fail-closed and are available below without competing with the confirmed record.
3 fields not established in reviewed sources
Ways to observe
Study the history of nuclear testing and its effects using UN, CTBTO and other competent institutional sources.
Compare the roles of the Nuclear Non-Proliferation Treaty and the Comprehensive Nuclear-Test-Ban Treaty without treating them as interchangeable.
Center survivor and affected-community testimony with consent and context rather than using graphic material.
Keep current treaty-status and verification claims refreshed because ratifications and diplomatic developments can change.
Useful facts
The International Day against Nuclear Tests is observed on 29 August.
The UN General Assembly established the day in 2009 through resolution 64/35.
Kazakhstan initiated the proposal.
29 August marks the 1991 closure of the Semipalatinsk nuclear test site.
The first observance was held in 2010.
Topic and context
What this page does not assume
- Keep the source-defined country, community, organizer or institutional scope; do not silently broaden it.
- Do not treat the title alone as proof of government recognition or public-holiday status.
- Do not add a creator, founding story or origin claim unless the supporting evidence establishes it.
- Remembrance Civic Context Care.
Evidence & sources
Repeated links from the authority record, institutional provenance and editorial guide research are consolidated here. Badges show how each source is used; a contextual source is never treated as proof of establishment on its own.
United Nations Secretary-General — first observance and Kazakhstan proposal (opens in a new tab)
United Nations — International Day against Nuclear Tests (opens in a new tab)
United Nations — List of International Days and Weeks (opens in a new tab)
United Nations — Observances: who chooses them and how (opens in a new tab)
Understand it, compare it, then explore further
Start with the most common factual questions, then use reviewed distinctions and related authority records to understand where this observance fits.
Frequently asked questions
When is International Day against Nuclear Tests?
29 August The stored recurrence guidance is: 29 August.
Does International Day against Nuclear Tests fall on the same date every year?
The authority record classifies it as fixed annual, so its month and day are reusable unless stronger evidence changes the rule.
Is International Day against Nuclear Tests an official public holiday?
The authority record verifies it within this scope: United Nations / international observance. That recognition does not by itself make it a statutory public holiday; the site only makes public-holiday claims when the supporting authority record explicitly does so.
Who established or recognizes International Day against Nuclear Tests?
The reviewed provenance layer identifies United Nations General Assembly as the proclaiming or establishing body. The proposer or originator is recorded separately as Kazakhstan.
Is International Day against Nuclear Tests international or country-specific?
The record has international or global institutional scope: United Nations / international observance. That does not mean every country treats the date as a public holiday or observes it in the same way.
How is this page verified?
The factual layer is source-backed and keeps its date rule, scope, provenance and editorial guardrails attached to the authority record. This record was checked on 2026-09-05.
Why is the International Day against Nuclear Tests on 29 August?
It marks the anniversary of the closure of the Semipalatinsk nuclear test site in Kazakhstan on 29 August 1991.
Who proposed and established the day?
Kazakhstan proposed the observance in 2009, and the UN General Assembly established it through resolution 64/35.
Is this the same as the International Day for the Total Elimination of Nuclear Weapons?
No. The 29 August observance focuses specifically on ending nuclear tests, while the 26 September observance addresses the broader objective of eliminating nuclear weapons.
How this differs from closely related observances
These distinctions are separately reviewed and source-backed. They clarify scope; they do not change either authority record.
Is International Day against Nuclear Tests the same as International Day for the Total Elimination of Nuclear Weapons?
The International Day against Nuclear Tests on 29 August focuses specifically on ending nuclear test explosions and remembering the effects of testing. The 26 September observance has the broader objective of the total elimination of nuclear weapons.
Open International Day for the Total Elimination of Nuclear Weapons →Distinction sources
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