Would you like to fly 200km downwind of the volcano? Of course not.
ReHeat
But that is the real question we can all see the billowing solid black clouds at the point of the eruption and no one would want to touch that.
But 2 Km, 20 km, 200km, 2000 km ??? downwind? at what point downwind does dispersion make a serious threat to life and limb become minimal to no threat?
Pace