So true. Our first Airbnb was in Flagstaff, and also our first stop driving our new S90D from L.A. area to Texas last summer.
The host told us all about Flagstaff's light restrictions-- she said it was a "dark city" or something like that-- porch lights had to shine only down, not into the sky.
That's probably because Lowell Observatory is in Flagstaff. Less light pollution makes for better telescope observations. Tucson is this way as well, due to Kitt Peak.