Don’t mind the cloud of radioactive pollution floating over Europe – it’s harmless, the French nuclear safety institute IRSN said Thursday.

Officials in Europe said they began detecting unusually high levels of ruthenium 106, a radioactive atom that does not occur naturally, near France in the last week of September.

The IRSN immediately “mobilized all its means of radiological monitoring of the atmosphere and conducted regular analysis of the filters from its monitoring stations,” the agency said in a press release.

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