οὐκ ἔστι γῆρας τοῦδε τοῦ μιάσματος → that pollution never wears out, that pollution can never grow old
alcyon: v. alcedo.
(1) alcўōn ou halcўōn, ŏnis, f. (ἀλκυών), alcyon [oiseau de mer] : Virg. G. 1, 399.