Ko te Radon te take tuarua o te mate pukupuku paru i roto i te US, e pā ana ki te 21,000 mate ia tau. Ko te mōrearea e piki ana 8<unk>16% mo ia 100 Bq / m3 piki ake i roto i te radon. He rerekē te taumata hau hau Radon i runga i te wāhi, me te hanganga o te oneone raro, me te toka. e pā ana ki tetahi i roto i te 15 kāinga i roto i te US kua taumata radon i runga ake i te aratohu o 4 picocuries ia rita (pCi / l) (148 Bq / m3).
te wāhi me te hanganga o te oneone me ngā toka kei raro