A***i
发帖数: 1351 | | g*****9
发帖数: 4125 | 2 Depending on where you live, some area is much higher than others, but no
where on this earth is 0 (that is my understanding)
【在 A***i 的大作中提到】
: 是不是大部分房子地下室都有radon gas?
| S********y
发帖数: 182 | 3 It depends where you live. Check EPA website for the overall Radon level in
your are. Radon exists not only in the basement, its level is also higher in
your kitchen if you have granite counter-top.
【在 A***i 的大作中提到】
: 是不是大部分房子地下室都有radon gas?
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