Very good graph of dust/ash concentration in real time is presented on the homepage of the meteoroligical station at Mt. Sonnblick in Austria (elev. 3106m):
www.sonnblick.net/portal/
So the ash IS there - it peaked on the 17th, today it is rising again.
Good luck to all of the operators, who are risking engines, airframes and lives - maybe not with a single flight in contaminated air. But who knows?
Thatīs not the "safe course of action" we were used to follow until a few days ago!