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The other night I was curious. My home had a radon test twenty years ago when it was purchased. The test struck me as a joke at the time. I was to seal off one room for a day, no people coming through, doors and windows closed. It is a converted garage that sits directly upon soil, under the flooring is a concrete pad without a crawlspace. The rest of the house has a crawlspace with limited ventilation, but in the winter the furnace is flushing it by using combustion air. In the summer, the windows are open. So what was being measured by this score of 11 pCi/liter? The first dozen sites said the same thing, radon causes residential lung cancer, and such and such are the desired radon levels. They were all repeating the same info from the EPA. (With this and climate fraud, I'm seeing why some conservatives want to defund the EPA.) Then I found this link at wiki.answers. When I first viewed this, it was a text slideshow, but now it's not. Maybe I got my links confused. Either way, it's the text we need. What is a dangerous level of radon Excerpts: "What we do know is that, contrary to popular belief, there is no known additional risk of cancer associated with radon levels as normally seen in houses. In fact, there is no science to support the common practice of radon measurement and radon mitigation in homes. The common practice is a "policy practice" not supported by science." and "...there is a growing body of data from epidemiological (case-control) studies showing a correlation between lung cancer and radon exposures in homes, that "correlation" to which they are referring is actually a NEGATIVE correlation. In other words, the correlation is inversely related to the radon concentration - This means that the growing body of data from epidemiological (case-control) studies are showing that the lung cancer rate DECREASES with increasing radon concentrations seen in residential settings." (Original boldface.) (Visitors: read further down this thread for more depth of topic.)