οὐκ ἔστι γῆρας τοῦδε τοῦ μιάσματος → that pollution never wears out, that pollution can never grow old
τἄνδοθεν, τὸ ἐντός, τὰ ἐντός, τὰ ἔνδον, τὰ ἔντοσθεν, ἔντοσθε