When did Chernobyl happen?

Chernobyl was a catastrophic nuclear accident that occurred on April 26, 1986, at the No. 4 reactor in the Chernobyl Nuclear Power Plant, located in the north of the Ukrainian SSR in the Soviet Union. The disaster happened when the power plant experienced a sudden surge of power, causing a steam explosion and a subsequent fire that released large amounts of radioactive particles into the atmosphere. It is considered to be the worst nuclear disaster in history, with devastating consequences for the environment and public health. The accident led to the evacuation and displacement of thousands of people from the surrounding areas and had long-lasting effects on the health of those exposed to radiation.