Just got the results of our short-term radon test, and the level is 8.9 pCi/L. The recommendation is to do another short-term test, but since radon's a common problem—'1 of 15 US homes, 1 of 3 Minnesota homes and 4 of 10 metro area homes exceed 4 pCi/L, the EPA’s “action level”'—and that number's high enough to worry me, we called our favorite realtor and got a rec for a radon removal firm.
More when I know it.
Radon is the second-leading cause of lung cancer. Scary.