οὐκ ἔστι γῆρας τοῦδε τοῦ μιάσματος → that pollution never wears out, that pollution can never grow old
adj.
Useful: P. and V. χρήσιμος, χρηστός, σύμφορος, προσφορος, Ar. and P. ὠφέλιμος, Ar. and V. ὠφέλήσιμος.