The average national indoor radon level is 1.3 pCi/L. (FAQ: What is a picocurie?)
The average indoor radon levels of Big Stone County, as determined by radon test results from Air Chek, is 5.5 pCi/L
Results under 2 pCi/L
Results between 2 and 3.9 pCi/L
Results 4 pCi/L and above
Additional information about radon levels in Big Stone County may be available through this website.