I live in Phoenix (actually Scottsdale) Arizona...Three million and growing. In the winter/spring, there are also lots of tourists.. If something were to happen, I don't think it would be feasible to get out of town. Plus, you would be "out in it" exposed to whatever contaminate. That's why I feel I would probably hunker down, and wait 6-8 hours. I am still torn about covering one room or the entire condo. [color:"green"] [/color]