It also changes throughout the year. I have a smart radon detector and radon mitigation system. It will randomly spike, despite the mitigation system it actually becomes detectable in my basement. It goes from basically 0 (0.1-0.3 pCi/L) most of the year to Low (1-1.5 pCi/L). Nowhere near the bad levels, but I get notified whenever it spikes.
It also changes throughout the year. I have a smart radon detector and radon mitigation system. It will randomly spike, despite the mitigation system it actually becomes detectable in my basement. It goes from basically 0 (0.1-0.3 pCi/L) most of the year to Low (1-1.5 pCi/L). Nowhere near the bad levels, but I get notified whenever it spikes.