Basements have elevated radon more often than slab on grade which have elevated radon more often than crawl space homes.
Jim McNees Alabama
Back in 1987 Alabama participated in the EPA national radon survey. 789 of our participants were self select, meaning they responded to our request for volunteers. 1,299 of our participants were randomly selected for solicitation by the EPA contractor. In areas of Alabama with significant indoor radon, the occurrence of homes with radon test results greater than 4 pCi/l was about twice as great in the self select participants as in the random select participants! Twice as great a % over 4 pCi/l.
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