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Well, we are still learning that, but this article from India says that 4″ to 5 times background is enough to cause concern.

“i don’t want to be an alarmist,” srinivasan said. “at the same time people in hyderabad – especially the builders and architects – should be aware that local granites used in house construction are a source of radiation much higher than normal,”

“we cannot tell for sure whether or not there is a health risk until the radon survey is carried out, srinivasan said.” The former director of AMD claims this is not an issue, but where there is disagreement, safety should always come first.