Noise Levels in California, Louisville, KY | Find Quiet Neighborhoods With Our Sound Map
58 dBA
Average noise across California
Normal conversation an arm’s length away
1,862
Residents above the EPA 55 dBA threshold
72% of California residents
78 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across California 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 1,862 California residents, or 71.5%, live above that level. By land area, 67.9% of California is above 55 dBA.
32.1% below 55 dBA
67.9% above 55 dBA
See how noise in California compares to similar-sized neighborhoods.
Noise by Part of California
Average noise levels for California residents, grouped by direction from the center of California. The highest population-weighted average is in southwestern California; the lowest is in southeastern California, where just 64% of residents live in blocks above the EPA's 55 dBA threshold, three-quarters of the share in the loudest section.
Southwestern California
62.3 dBA · Loud
Busy restaurant
Western California
60.2 dBA · Loud
Normal conversation an arm’s length away
Central California
59.2 dBA · Loud
Normal conversation an arm’s length away
Northwestern California
58.4 dBA · Loud
Normal conversation an arm’s length away
Southeastern California
56.5 dBA · Moderate-loud
Normal conversation an arm’s length away
To the human ear, noise in southwestern California sounds about 49% louder than in southeastern California, a 5.8 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 W Kentucky St do you need to be?
W Kentucky St produces an estimated 60 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
60 dBA
Normal conversation an arm’s length away
165 ft
47 dBA
Quiet office
330 ft
39 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 18% of California sits under tree canopy (about average for neighborhoods) and roughly 59% 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.
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Rail Noise
Active freight rail runs through parts of California. For most blocks the rail-only contribution is small. Combined road-plus-rail noise rarely exceeds road noise on its own. The exceptions are the handful of blocks within roughly a quarter mile of the right-of-way during pass-through hours.
Use the Rail toggle on the map above to isolate rail's contribution from road and aviation.
Airport Noise
Louisville Muhammad Ali International (SDF) sits southeast of California. 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 55 dBA on the map's Overall layer. Blocks on the opposite side of California, particularly to the northwest, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across California
The bar chart below shows the share of California residents in each noise band. About 19% of residents live below the EPA's 55 dBA threshold, and roughly 23% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How California Compares
California sits at the quieter end of the spectrum. Below: how California's average outdoor noise and share of residents above the EPA threshold compare with Park Hill, university-louisville-ky, South Louisville, and shelby-park-louisville-ky.
Average noise level (dBA)
California's 57.5 dBA pop-weighted average is at the quieter end of the spectrum. Kentucky as a whole averages 50.5 dBA and the U.S. averages 52.0 dBA. Both are lower than California because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 71.5% of California 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, 67.9% of California's footprint sits above 55 dBA, against a Kentucky average of 23.2% and a national average of 28.1%.
What This Means if You're Moving to California
- 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 W Kentucky St 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 18% of California is under tree cover (about average for 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. Louisville Muhammad Ali International's approach paths concentrate aviation noise to the southeast. Neighborhoods to the northwest of downtown show no measurable contribution from the airport.
