This map shows modeled outdoor noise across 94591 at 100-meter resolution, combining road, aviation, and rail sources. Green areas measure below 45 dBA. Orange and red exceed the EPA's 55 dBA outdoor threshold linked to long-term health effects. Use the layer toggles to view each source on its own or all together.
What the numbers sound like
- 30 dBAWhisper
- 40 dBASoft rainfall
- 45 dBAQuiet suburban street at night
- 50 dBAQuiet office
- 55 dBAEPA outdoor threshold: light traffic 100 ft away
- 60 dBANormal conversation an arm's length away
- 65 dBABusy restaurant
- 70 dBAHighway traffic 50 ft away
- 80 dBACity bus interior
Population Above the EPA Outdoor Threshold
The EPA's 55 dBA outdoor reference level is a common benchmark for residential noise exposure, especially for activity interference, annoyance, and long-term community noise concerns. About 16,416 94591 residents, or 32.4%, live above that level. By land area, 40.3% of 94591 is above 55 dBA.
See how noise in 94591 compares to similar-sized zip codes.
Noise by Part of 94591
Average noise levels for 94591 residents, grouped by direction from the center of 94591. Western 94591 carries the highest population-weighted average; Eastern 94591 carries the lowest. Just 18% of residents in Eastern 94591 live in blocks above the EPA's 55 dBA threshold, a third of the share in Western 94591.
Central 94591
42% of people above 55 dBA
Eastern 94591
18% of people above 55 dBA
Northern 94591
23% of people above 55 dBA
Southern 94591
36% of people above 55 dBA
Western 94591
61% of people above 55 dBA
Western 94591 sounds about 62% louder than Eastern 94591 to the human ear, a 7.0 dBA gap. Every 10 dBA roughly doubles perceived loudness. Within any of these directions, two homes a quarter mile apart can still differ by 10 or more dBA depending on how close they sit to a major highway.
How far back from I-80 do you need to be?
I-80 produces an estimated 80 dBA at its loudest centerline points. Noise drops logarithmically with distance, with the exact rate depending on what's between you and the road. Tree cover, walls, terrain, and pavement type all matter. At roughly a quarter mile back, traffic fades into the noise level of a soft rainfall.
Calculated from the model's calibrated attenuation formula. About 7% of 94591 sits under tree canopy (lighter than most zip codes) and roughly 46% is impervious surface like pavement and rooftops. Both are folded into the per-place decay rate above. Heavier canopy pulls noise down faster with distance; impervious surfaces slow the drop.