An answer to your diagnosis of PHX lung issues is right on. A friend who grew up there told me that there was a long-term effect from all the people with TB who went to PHX to recover. PHX is particularly hot (coping) because it sits in a bowl, geographically. This person told me that because of that, evidently the air doesn't circulate well there to clear out the TB. She said that for a time, and maybe even now, there was public medical assistance for anyone who comes down with TB in Phoenix.
I was very interested in this as I lived in Tucson, AZ for 3 years. I loved it there - sense of
