Problem is, why are the planes grounded???
A: Becasuse the the sky is now full of sulphur ash
Im guessing the natural act of the volcano, is far worse than man made polution
On the deck where planes do most damage on take off is where the greens harp on about most, the greens are forever around airports, and even in city centres taking reading for this that and the other types of pollution, now theres no planes moving it is their ideal time to get some readings and wallop us with proof and evidence, instead of smart-arse answers
Its the damage that the ash particles can do to the plane that has grounded them, not because the volcano will leave a potentially hoooge footprint.