οὐκ ἔστι γῆρας τοῦδε τοῦ μιάσματος → that pollution never wears out, that pollution can never grow old
ἀκατάληκτος, ἀίδιος, ἄτρυτος, ἀπέραντος, ἄπαυστος, ἀδιεξίτητος