3 ms·

There are caves and mines that have radon from natural sources. Why are people hanging out in Montana's radon-filled mines? https://www.mtpr.org/montana-news/

• defrost 2y ago
  Granite sided valleys fill every day with radon until wind clears it out. Certainly not as dense as basements and caves but worth pointing out that radon is a constant ongoing decay product of natural uranium in rock.