This map shows modeled outdoor noise across 93428 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 1,408 93428 residents, or 31.4%, live above that level. By land area, 30.6% of 93428 is above 55 dBA.
See how noise in 93428 compares to similar-sized zip codes.
Noise by Part of 93428
Average noise levels for 93428 residents, grouped by direction from the center of 93428. The highest population-weighted average is in southern 93428; the lowest is in northeastern 93428, where just 7% of residents live in blocks above the EPA's 55 dBA threshold, a third of the share in the loudest section.
Southern 93428
34% of people above 55 dBA
Southwestern 93428
30% of people above 55 dBA
Eastern 93428
12% of people above 55 dBA
Southeastern 93428
5% of people above 55 dBA
Northeastern 93428
7% of people above 55 dBA
To the human ear, noise in southern 93428 sounds about 80% louder than in northeastern 93428, a 8.5 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 do you need to be?
produces an estimated 65 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 21% of 93428 sits under tree canopy (about average for zip codes) and roughly 26% 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.