Originally Posted by VAACman
5) The safe concentration of ash issue has been ongoing for a while and it's not simple. Most of all it's the users (airline industry) that needs to set a warning standard that the VAACs aim to achieve - at the moment it's avoid all ash, which in practice means avoid all 'visible' (reasonable evidence that it's there) ash.
There you have it. Even a VAAC insider says it: avoid all 'visible' (reasonable evidence that it's there) ash.
All the rest is overreacting!
