Never had blue ice fall on us when we lived under O'Hare airport's lannidg pattern. A neighbor, two doors down, did have a chunk of metal (part of a flap, if I remember) drop in his back yard. The odd thing was, he was chairman of a suburban committee that kept trying to get flights cut back to cut down on noise. Hmm.And I can assure you from first-hand knowledge, that NOTHING on the sidewalks of NYC is non-toxic. Even the concrete can kill ya! Of course using bacon grease on your pits will keep you from needing glasses. The first time you go out on a hot day, a pack of wild dogs will eat you! Such fonts of . wisdom?