This map shows modeled outdoor noise across Chabot Terrace 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 2,607 Chabot Terrace residents, or 40.1%, live above that level. By land area, 47.5% of Chabot Terrace is above 55 dBA.
See how noise in Chabot Terrace compares to similar-sized neighborhoods.
Noise by Part of Chabot Terrace
Average noise levels for Chabot Terrace residents, grouped by direction from the center of Chabot Terrace. The highest population-weighted average is in western Chabot Terrace; the lowest is in southern Chabot Terrace, where just 32% of residents live in blocks above the EPA's 55 dBA threshold, three-quarters of the share in the loudest section.
Western Chabot Terrace
45% of people above 55 dBA
Southeastern Chabot Terrace
63% of people above 55 dBA
Northwestern Chabot Terrace
34% of people above 55 dBA
Northeastern Chabot Terrace
39% of people above 55 dBA
Southern Chabot Terrace
32% of people above 55 dBA
To the human ear, noise in western Chabot Terrace sounds about 100% louder than in southern Chabot Terrace, a 10.0 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 State Rte 37 do you need to be?
State Rte 37 produces an estimated 76 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 4% of Chabot Terrace sits under tree canopy (much lighter than most neighborhoods) and roughly 55% 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.