I have to say there was remarkably little chatter and certainly no panic around here (Hanford) for everyone getting dusted with easily measured “hot particles”. I’m skeptical about the “ten hot particles in an average lung in Seattle” part.
Just because some stuff goes over in the jetstream doesn’t mean a lot of it has to dump on any one particular spot on the ground. It has never been a problem in the past to detect precipitated radioactive particles and I don’t know why it should be now.