This map shows modeled outdoor noise across Birdland Neighbors 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 2,463 Birdland Neighbors residents, or 45.6%, live above that level. By land area, 47.5% of Birdland Neighbors is above 55 dBA.
See how noise in Birdland Neighbors compares to similar-sized neighborhoods.
Noise by Part of Birdland Neighbors
Average noise levels for Birdland Neighbors residents, grouped by direction from the center of Birdland Neighbors. The highest population-weighted average is in eastern Birdland Neighbors; the lowest is in western Birdland Neighbors, where just 46% of residents live in blocks above the EPA's 55 dBA threshold, roughly the same as the share in the loudest section.
Eastern Birdland Neighbors
48% of people above 55 dBA
Northeastern Birdland Neighbors
35% of people above 55 dBA
Central Birdland Neighbors
46% of people above 55 dBA
Southwestern Birdland Neighbors
52% of people above 55 dBA
Western Birdland Neighbors
46% of people above 55 dBA
To the human ear, noise in eastern Birdland Neighbors sounds about 77% louder than in western Birdland Neighbors, a 8.2 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.
Airport Noise
Norman Y Mineta San Jose International (SJC) sits east of Birdland Neighbors. 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 Birdland Neighbors, 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 Birdland Neighbors
The bar chart below shows the share of Birdland Neighbors residents in each noise band. About 55% of residents live below the EPA's 55 dBA threshold, and roughly 5% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Birdland Neighbors Compares
Birdland Neighbors sits at the quieter end of the spectrum. Below: how Birdland Neighbors's average outdoor noise and share of residents above the EPA threshold compare with South Los Altos, San Miguel, North Whisman, and Fairmeadow.
Average noise level (dBA)
Birdland Neighbors's 54.6 dBA pop-weighted average is at the quieter end of the spectrum. California as a whole averages 54.0 dBA and the U.S. averages 52.0 dBA. Both are lower than Birdland Neighbors because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 45.6% of Birdland Neighbors residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's in the middle of its peer group. Measured by land area instead, 47.5% of Birdland Neighbors'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 Birdland Neighbors
- 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 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 10% of Birdland Neighbors is under tree cover (lighter than most neighborhoods), 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. Norman Y Mineta San Jose International'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.
Federal datasets used:
FHWA Highway Performance Monitoring System: road geometry, traffic counts, lane configuration
U.S. DoT Bureau of Transportation Statistics National Transportation Noise Map: aviation and rail noise, road calibration ground truth
USGS / MRLC National Land Cover Database: land cover and impervious surface coverage
USDA Forest Service Tree Canopy Cover: vegetation density for sound propagation
U.S. Census Bureau TIGER/Line: block-level geography and population
U.S. EPA Levels Document: 55 dBA outdoor reference level
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.