Originally Posted by
peter we
What exactly would showing a few spots of clean air surrounded by ash achieve?
Last time I looked, the purpose of flying is to get from A to B, not circle in a 10 mile patch of clean air.
Have we touched a raw nerve?
My argument for a more detailed contour plot was that it would allow those who wish to to make a safety case for areas where concentrations are >4mg per m3. At present this limit is "The Edge of the World" (quite appropriate when you think about the "science" involved) and no one can possibly make a safety case (as the regulators claim they have been expecting to receive) for areas that could have a concentration slightly above 4 mg per m3 or any arbitrarily large concentration >4mg per m3.