My goats are by the side of our farm track, and each time the cars go up and down, we get a giant cloud of white dust over the field. I think your goats will be ok. No matter where we keep our livestock there is always something blowing into their field etc. Where I lived before, next door farmer would come and fertilise right up to the fence. It made my eyes water, and I was paranoid about it going in the goats water buckets!!!
Silaging? We have no grass to silage here, due to the very dry weather.
Oh yes, have you seen that we have wished you a happy birthday? I should have put it under goats, shouldn't I?!!!