οὐκ ἔστι γῆρας τοῦδε τοῦ μιάσματος → that pollution never wears out, that pollution can never grow old
v. trans.
P. and V. οὐ χαρίζεσθαι (dat.), P. ἀγνωμονεῖν εἰς or πρός (acc.).