Have heard of it for about 5 years.
I don't worry about it because I think there's plenty of air exchange in my house, including the basement. My furnace fan runs most of the summer bringing in lots of fresh air, and I have air returns and combustion air drawn from the basement. And I've looked for statistics or reported evidence that there's a higher likelihood of there being a problem in my area of the city and found none.
Detailed story made short:I think radon is only a huge problem when air when air flow in basements is very poor, or in very well sealed houses with minimal air exchange. AND, ofcourse, there must be the correct underlying soil conditions. But maybe I just have my head in the sand because I don't want to get suckered into paying for a test kit.
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