How Loud Is San Francisco, CA?
San Francisco is dense but has surprisingly few freeways in its core, so its noise is street-level: Muni, buses, delivery traffic, and construction. The loudest bands follow 101 through SoMa and the Bayshore, and the Bay Bridge approach through Rincon Hill. SFO sits ten miles south — its noise lands mostly on Peninsula cities like Millbrae and San Bruno rather than the city itself.
San Francisco Noise Map
The map below combines two data sources: the official U.S. DOT National Transportation Noise Map (modeled 24-hour average road, rail, and aviation noise — the colored bands) and real decibel readings measured by DecibelMap users (the dots). Drag and zoom to explore any neighborhood.
Colored bands: modeled traffic noise, quieter → louder (yellow 45 dB → orange → red → pink → purple → blue 90+ dB). Source: U.S. DOT Bureau of Transportation Statistics, 2022. Dots: crowdsourced readings.
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🎤 Measure Noise in San FranciscoOpen the full map — measure your street in 5 seconds
What Makes San Francisco Loud
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San Francisco International (SFO)
Aircraft arrivals and departures create corridors of elevated noise — check the purple/blue bands on the map.
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Major corridors: US-101, I-80 (Bay Bridge approach), I-280
Highway noise typically reaches 65–75 dB within a block of the roadway and stays audible for a half mile or more.
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Rail
Muni Metro, BART, Caltrain.
Noise Levels Reference
| Environment | Typical dB | What It Means |
|---|
| Quiet residential | 30–45 dB | Birdsong and leaves — ideal for sleep |
| Suburban street | 45–55 dB | Occasional cars, generally calm |
| Moderate urban | 55–65 dB | Steady background hum |
| Busy road | 65–75 dB | Raised-voice territory |
| Highway / flight path | 75–85+ dB | Constant stress, health risk over time |
The WHO recommends under 40 dB in bedrooms for healthy sleep. If a street reads above 60 dB with windows open, expect to rely on closed windows, white noise, or earplugs.
Check a Specific Address in San Francisco
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Search the address
Type any street address in the search bar. Check the colored noise bands and nearby readings.
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Measure it yourself
On site, tap the 🎤 button — 5 seconds later your reading is pinned to the map and helps the next person.
Common Questions
How loud is San Francisco?
Noise levels in San Francisco vary widely by neighborhood. Streets near US-101, I-80 (Bay Bridge approach), I-280 typically measure 60–75 dB, while residential streets away from major corridors are usually 40–55 dB. Use the interactive map above to see modeled transportation noise for any block in San Francisco, plus real crowdsourced decibel readings.
What are the loudest areas in San Francisco, CA?
The loudest areas of San Francisco are generally along the major highway corridors (US-101, I-80 (Bay Bridge approach), I-280) and under the flight paths serving San Francisco International (SFO). San Francisco is dense but has surprisingly few freeways in its core, so its noise is street-level: Muni, buses, delivery traffic, and construction.
What is a good noise level for an apartment in San Francisco?
The WHO recommends under 40 dB inside bedrooms for healthy sleep. When checking an apartment, aim for a street reading below 60 dB with windows open — quieter than that, closed windows can usually get interiors into the sleepable range. Visit at rush hour and late evening before signing a lease.
How can I measure noise levels in San Francisco?
Open decibelmap.com on your phone at any location in San Francisco, tap the microphone button, and hold still for 5 seconds. The reading is pinned to your GPS location on the global map. No app download or signup needed, and no audio is recorded — only the decibel number.
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