In 2017, atmospheric radiation spiked to as much as 100 times that seen during the Fukushima disaster. Now the source has been traced to a facility in Russia
Source:
https://www.newscientist.com/article/2211511-gigantic-mysterious-radiation-leak-traced-to-facility-in-russia/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home