Noise Levels in 91401, CA | Find Quiet Neighborhoods With Our Sound Map
56 dBA
Average noise across 91401
Quiet office to normal conversation
14,767
Residents above the EPA 55 dBA threshold
40% of 91401 residents
72 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across 91401 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.
Overall
Road
Rail
Aviation
Click the map to explore
35 dBa55 dBa (EPA limit)90+ dBa
3545557090
Quietest (dBA)Loudest
Colorblind friendlyoff
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 14,767 91401 residents, or 40.2%, live above that level. By land area, 40.9% of 91401 is above 55 dBA.
Average noise levels for 91401 residents, grouped by direction from the center of 91401. Northern 91401 carries the highest population-weighted average; Central 91401 carries the lowest. Just 47% of residents in Central 91401 live in blocks above the EPA's 55 dBA threshold, roughly the same as the share in Northern 91401.
Central 91401
53.7 dBA · Moderate-loud
Quiet office to normal conversation
47% of people above 55 dBA
QuietLoud
Eastern 91401
56.9 dBA · Moderate-loud
Normal conversation an arm’s length away
48% of people above 55 dBA
QuietLoud
Northern 91401
58.3 dBA · Loud
Normal conversation an arm’s length away
49% of people above 55 dBA
QuietLoud
Southern 91401
54.0 dBA · Moderate-loud
Quiet office to normal conversation
25% of people above 55 dBA
QuietLoud
Western 91401
54.4 dBA · Moderate-loud
Quiet office to normal conversation
36% of people above 55 dBA
QuietLoud
Northern 91401 sounds about 38% louder than Central 91401 to the human ear, a 4.6 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 US Hwy 101 do you need to be?
US Hwy 101 produces an estimated 58 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.
At source
58 dBA
Normal conversation an arm’s length away
165 ft
44 dBA
Quiet suburban street at night
330 ft
36 dBA
Soft rainfall
660 ft
35 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 6% of 91401 sits under tree canopy (lighter than most zip codes) and roughly 61% 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.
-->
Airport Noise
Bob Hope (BUR) sits east of 91401. The U.S. Department of Transportation models aviation noise around this airport from federal traffic data, and the model uses those federal measurements rather than synthetic predictions.
Blocks under the approach and departure paths carry combined road-plus-aviation noise, with some exceeding 45 dBA on the map's Overall layer. Blocks on the opposite side of 91401, particularly to the west, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across 91401
The bar chart below shows the share of 91401 residents in each noise band. About 52% of residents live below the EPA's 55 dBA threshold, and roughly 20% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How 91401 Compares
91401 sits the lowest among the peer group. Below: how 91401's average outdoor noise and share of residents above the EPA threshold compare with 91606, 91601, 91352, and 91607.
Average noise level (dBA)
91401's 55.5 dBA pop-weighted average is the lowest among the peer group. California as a whole averages 54.0 dBA and the U.S. averages 52.0 dBA. Both are lower than 91401 because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 40.2% of 91401 residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's fewer than any of its peer group. Measured by land area instead, 40.9% of 91401's footprint sits above 55 dBA, against a California average of 36.0% and a national average of 28.1%.
What This Means if You're Moving to 91401
Distance from highways matters more than the neighborhood name. Two homes in the same zip code can differ by 20 dBA if one sits 100 meters from US Hwy 101 and the other 500 meters away. The model captures this at 100-meter resolution, so noise exposure changes block by block.
Tree canopy can help reduce modeled noise exposure. Roughly 6% of 91401 is under tree cover (lighter than most zip codes), and the dominant land cover is medium-intensity developed land. Both are measured from federal USDA Forest Service and USGS satellite imagery at 30-meter resolution. Streets with 60% or higher canopy show 3 to 5 dBA lower noise than comparable streets with bare ground or pavement, which is why the per-place decay rate above already accounts for it.
Airport noise is directional. Bob Hope's approach paths concentrate aviation noise to the east. Neighborhoods to the west of downtown show no measurable contribution from the airport.
Sources & Methodology
The BestNeighborhood noise model is calibrated against nearly one million federal ground-truth measurements across four states. Road noise is computed from segment-level federal traffic data and propagated outward using physics-based acoustic decay, with attenuation rates that depend on the surrounding land cover.
All inputs are published federal datasets. Block-level noise is computed by combining road, rail, and aviation sound sources in the energy domain, the same physics used in professional environmental noise assessments. Read the full methodology.
