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@samebchase The ground – from uranium in rocks, to be precise:

“Radon is a radioactive gas that causes lung cancer. It is formed in the ground by the radioactive decay of uranium which is present in all rocks and soils. You cannot see it, smell it or taste it. It can only be measured with special detectors. Radon can cause lung cancer when exposed to high levels over a long period of time. Every year in Ireland, radon causes about 350 cases of lung cancer.”

https://www.epa.ie/environment-and-you/radon/