ExplainerThe legend of the radioactive cloud that supposedly never crossed into France has left a lasting mark on the national imagination. Yet that narrative has been rewritten many times over the decades.

What image should France keep of the political and media coverage of the 1986 Chernobyl disaster? The front page of the former French daily France-Soir with the headline "Radioactive clouds over France"? Or the statement from France's Ministry of Agriculture claiming the clouds had merely "brushed past" the east of the country? The weather map broadcast on television showing a "STOP" sign above the Alps, for which the weather presenter recently apologized? Or the discreet correction aired by the channel the next day, now largely forgotten?

Forty years after the April 26, 1986, accident in Soviet Ukraine, the fact that the authorities claimed the radioactive cloud stopped at the French border continues to haunt the national imagination. For some, it was a state lie; for others, a conspiracy theory fueled by anti-nuclear journalists. Le Monde retraced the story, which took root in a climate of mistrust and failed official communication.

Contrary to popular belief, the passage of the radioactive cloud over France was not concealed. French daily France-Soir made it its front-page headline on May 2, 1986, reading: "Radioactive clouds over France".

Since April 28, 1986, when Sweden detected abnormal radioactivity and the Soviet Union acknowledged a nuclear accident in Ukraine, the French worried: Would the particles released into the atmosphere reach them, and what were the risks?

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