Mark, you and I seem to have similar urban survival views and experiences. Maybe because we live so near each other. PM me. I too use an Xscaper kit for urban self rescue, I.e. Get me out of this smoke filled building , tunnel, etc. Best bang for the buck,IMO. For dust I use swim goggles, slightly larger than the tiny common models. Bought at Campmor. I also use the flat fold 3M N-95 masks with the oneway valve.