加拿大是高氡地区。氡是从岩石、土壤和水中自然释放出来的一种无味、不可见的放射性气体。它可以通过细小的裂缝和孔洞渗入室内,并随着时间的推移不断积累。据加拿大肺脏协会(CLA)称,它也是仅次于香烟的导致肺癌 ...
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