I thought the dust was about 11k up so not settling but I was told it had been on the news!!
Well, the heat from the volcano has pushed it right up high, where it will waft about and eventually disperse on the winds. As for potential harm; car fumes are more deadly. As are loads of industrial pollutants in the air. The dilution of particles by the time they get here, if they do at all, will be too little to do any damage. I am a bit concerned for the people of Iceland though. They're mostly quite nice.
If you think about all the volcanoes that have erupted throughout history, and the fact that we're all still here, shows that it's going to take something a tad bigger than this one to threaten survival.
We could very well be doomed, however. I'm not sure yet. 😕