International Day against Nuclear Tests

The International Day against Nuclear Tests on August 29 is a United Nations date. It commemorates the 1991 closure of the Semipalatinsk test site in Kazakhstan.

United NationsAugustnuclearpeaceKazakhstan

International Day against Nuclear Tests - The International Day against Nuclear Tests on August 29 is a United Nations date. It commemorates the 1991 closure of the Semipalatinsk test site in Kazakhstan.

About International Day against Nuclear Tests

History & origins

The UN General Assembly established the International Day against Nuclear Tests. August 29 recalls the 1991 closure of the Semipalatinsk test site in Kazakhstan, one of the Soviet Union’s primary testing grounds.

Why it matters

The day is about ending explosive nuclear testing and remembering affected communities, not celebrating weapons.

How to celebrate

Read why the UN chose August 29, learn what a comprehensive test-ban treaty is, and skip conspiracy content.

Facts

The UN observes the day on August 29
The date marks the 1991 closing of the Semipalatinsk nuclear test site
It is not a U.S. federal holiday

Upcoming dates

Saturday, August 29, 2026
Sunday, August 29, 2027
Tuesday, August 29, 2028
Wednesday, August 29, 2029
Thursday, August 29, 2030

Frequently asked questions

When is International Day against Nuclear Tests in 2026?

International Day against Nuclear Tests in 2026 falls on Saturday, August 29, 2026.

Why August 29?

It marks the 1991 closure of the Semipalatinsk test site.

Who created it?

The United Nations.

Is it a U.S. holiday?

No.

Help others discover this day by sharing it.

Explore more

Full calendar More International days All categories Home

Related days

International Women's Day

Celebrate the achievements and contributions of women worldwide on International Women's Day! This global day recognizes the social, economic, cultural, and political achievements of women while calling for gender equality. Join the movement to create a more inclusive world where women and girls can reach their full potential.

World Environment Day

Protect our planet and promote environmental awareness on World Environment Day! This global celebration encourages individuals and communities to take action for environmental protection and sustainability. Learn about environmental challenges, discover eco-friendly practices, and join millions worldwide in making a positive impact on our Earth's future.

International Day of Remembrance of and Tribute to the Victims of Terrorism

The United Nations International Day of Remembrance of and Tribute to the Victims of Terrorism falls on August 21. It is a solemn UN date for victims and families, not a U.S. federal holiday.

World Photography Day

Capture the moment on World Photography Day! This global celebration honors the art, craft, science, and history of photography. From professional photographers to smartphone snappers, everyone celebrates the power of images to tell stories and preserve memories.

World Beer Day

Raise a pint on World Beer Day! The first Friday of August celebrates beer culture globally. From craft breweries to major brands, beer is enjoyed by billions and represents a multi-hundred-billion dollar global industry.