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Houses with levels over 10 pCi/L

In a 1987 Wisconsin-US EPA random study of 1100 houses, one-year follow-up measurements were done on the first floors in 200 houses where basement 2-day screening levels were over 4 pCi/L.  

The study showed the year main floor radon test results ranged from 10% to 100% of the corresponding basement short-term results, with most clustered near the average, 40%.  

Basements over 10 pCi/L correspond, statistically in the table (though not for any particular house) to main-floor year averages over the EPA 4 pCi/L guideline.  The more measurements there are in the table for a given zip code, the more statistically representative is the estimating procedure.


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