Flagstaff, AZ Noise Levels
Flagstaff, AZ: what the federal noise map shows
Flagstaff, AZ reads 47.5 dB(A) on BTS's 24-hour average, inside HUD's "Acceptable" noise zone, 65 dB(A) day-night average or below under 24 CFR 51.104, the federal government's own line for building housing with no extra sound attenuation required. Treat this as Flagstaff's one representative point, not a promise about every block in it, BTS's map wasn't built to resolve individual streets.
Flagstaff's noise, by source
Each of the three transportation modes gets its own model from BTS; the combined figure above is what they add up to.
Where Flagstaff ranks
Among the 3,622 US places in this dataset with any measurable transportation noise, Flagstaff ranks 1,870, loudest first. By population, it ranks 489 of the 12,137 places in this dataset, home to about 77,539 people.
Your street may differ from Flagstaff's reading
For a single house or lot in Flagstaff rather than the town-wide figure above, BTS's own map is the same free source, queried directly.
More on how this number was built
For exactly which federal dataset feeds Flagstaff's figure, see the methodology guide. The guide to reading a quiet result explains what "no measurable noise" actually means at Flagstaff.