Noise Levels in Sycamore Hills, MO | Find Quiet Neighborhoods With Our Sound Map

59 dBA
Average noise across Sycamore Hills
Normal conversation an arm’s length away
348
Residents above the EPA 55 dBA threshold
52% of Sycamore Hills residents
80 dBA
Loudest residential point
City bus interior

This map shows modeled outdoor noise across Sycamore Hills 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
Sycamore Hills, MO Map of Noise Levels in Sycamore Hills
Click the map to explore
35 45 55 70 90
Quietest (dBA) Loudest
Colorblind friendly off

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 348 Sycamore Hills residents, or 52.3%, live above that level. By land area, 59.1% of Sycamore Hills is above 55 dBA.

See how noise in Sycamore Hills compares to similar-sized cities.

Eastern Sycamore Hills sounds about 0% louder than Central Sycamore Hills to the human ear, a 0.0 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.

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How far back from do you need to be?

produces an estimated 80 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
80 dBA
City bus interior
165 ft
65 dBA
Busy restaurant
330 ft
56 dBA
Normal conversation an arm’s length away
660 ft
47 dBA
Quiet office
¼ mile
39 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall

Calculated from the model's calibrated attenuation formula. About 25% of Sycamore Hills sits under tree canopy (about average for cities) and roughly 39% 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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Airport Noise

St Louis Lambert International (STL) sits north of Sycamore Hills. 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 65 dBA on the map's Overall layer. Blocks on the opposite side of Sycamore Hills, particularly to the south, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.

How Noise Is Distributed Across Sycamore Hills

The bar chart below shows the share of Sycamore Hills residents in each noise band. About 14% of residents live below the EPA's 55 dBA threshold, and roughly 26% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.

How Sycamore Hills Compares

Sycamore Hills sits at the louder end of the spectrum. Below: how Sycamore Hills's average outdoor noise and share of residents above the EPA threshold compare with Pasadena Park, Edmundson, Flordell Hills, and Greendale.

Average noise level (dBA)

Sycamore Hills's 59.1 dBA pop-weighted average is at the louder end of the spectrum. Missouri as a whole averages 53.9 dBA and the U.S. averages 52.0 dBA. Both are lower than Sycamore Hills because most of either area is rural land away from major roads.

Share of residents above 55 dBA

About 52.3% of Sycamore Hills 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, 59.1% of Sycamore Hills's footprint sits above 55 dBA, against a Missouri average of 32.5% and a national average of 28.1%.

What This Means if You're Moving to Sycamore Hills

  • 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 25% of Sycamore Hills is under tree cover (about average for cities), and the dominant land cover is low-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. St Louis Lambert International's approach paths concentrate aviation noise to the north. Neighborhoods to the south 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.

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