San Francisco, CA Noise Levels
San Francisco, CA: what the federal noise map shows
At San Francisco, CA, road, rail and aircraft noise all fall below the 45 dB(A) floor BTS's national map can distinguish from silence. Treat this as San Francisco's one representative point, not a promise about every block in it, BTS's map wasn't built to resolve individual streets.
Where San Francisco ranks
San Francisco, CA sits among 8,515 US places this dataset covers with no measurable transportation noise, out of 12,137 places checked overall. Population is about 827,526, 19th largest of the 12,137 places covered here.
Your street may differ from San Francisco's reading
For a single house or lot in San Francisco 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 San Francisco's figure, see the methodology guide. The guide to reading a quiet result explains what "no measurable noise" actually means at San Francisco.