氡气是一种无色无味的放射性气体，由地下土壤中的铀自然衰变产生。当氡气从地下释放出来后，可能通过房屋的地基裂缝、管道和其他开口进入室内。如果氡气浓度过高，长期暴露于氡气中会增加患肺癌的风险，尤其是在封闭 ...
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