Gengis - the key is in "and records it for monitoring and analysis." This dust/ash is, we are told, quite different to both 'normal' volcanic ash and, say, something like Saharan desert dust - surely it is possible to separate? Why is it not possible also to have a sampler which can be isolated until needed - a simple motorised door would do? This part of the world is going to have come up with something PDQ as it looks as if the problem is with us for a while.