The 40th anniversary of the Chernobyl disaster was marked on 26 April 2026.
Radioactive materials are unstable substances that release energy (radiation) when atoms break down; in a reactor, uranium atoms split (nuclear fission) to produce heat and energy.
In 1986, an explosion at the Chernobyl nuclear plant released radioactive particles into the air, spreading across Europe and exposing millions.
These particles travelled as dust and smoke, contaminating land, water and living beings, and causing diseases like cancer.
The area became an exclusion zone and is now covered by a protective structure called New Safe Confinement.
Recent risks during the Russia-Ukraine war, including damage near the Zaporizhzhia Nuclear Power Plant, have raised fresh safety concerns.