Noise Levels in 9th Ward, Wilmington, DE | Find Quiet Neighborhoods With Our Sound Map
58 dBA
Average noise across 9th Ward
Normal conversation an arm’s length away
2,224
Residents above the EPA 55 dBA threshold
78% of 9th Ward residents
63 dBA
Loudest residential point
Busy restaurant
This map shows modeled outdoor noise across 9th Ward 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 2,224 9th Ward residents, or 78.5%, live above that level. By land area, 79.5% of 9th Ward is above 55 dBA.
Average noise levels for 9th Ward residents, grouped by direction from the center of 9th Ward. Northern 9th Ward carries the highest population-weighted average; Central 9th Ward carries the lowest. Just 77% of residents in Central 9th Ward live in blocks above the EPA's 55 dBA threshold, roughly the same as the share in Northern 9th Ward.
Central 9th Ward
58.1 dBA · Loud
Normal conversation an arm’s length away
77% of people above 55 dBA
QuietLoud
Northern 9th Ward
59.0 dBA · Loud
Normal conversation an arm’s length away
80% of people above 55 dBA
QuietLoud
Southern 9th Ward
58.6 dBA · Loud
Normal conversation an arm’s length away
86% of people above 55 dBA
QuietLoud
Northern 9th Ward sounds about 6% louder than Central 9th Ward to the human ear, a 0.9 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 do you need to be?
produces an estimated 63 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
63 dBA
Busy restaurant
165 ft
48 dBA
Quiet office
330 ft
40 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 25% of 9th Ward sits under tree canopy (heavier than most neighborhoods) and roughly 52% 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
Philadelphia International (PHL) sits northeast of 9th Ward. The U.S. Department of Transportation measures aviation noise around this airport directly, 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 75 dBA on the map's Overall layer. Blocks on the opposite side of 9th Ward, particularly to the southwest, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across 9th Ward
The bar chart below shows the share of 9th Ward residents in each noise band. About 16% of residents live below the EPA's 55 dBA threshold, and roughly 40% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How 9th Ward Compares
9th Ward sits at the quieter end of the spectrum. Below: how 9th Ward's average outdoor noise and share of residents above the EPA threshold compare with Cool Springs, Highlands, Northwest Wilmington, and Hedgeville.
Average noise level (dBA)
9th Ward's 58.3 dBA pop-weighted average is at the quieter end of the spectrum. Delaware as a whole averages 53.5 dBA and the U.S. averages 52.0 dBA. Both are lower than 9th Ward because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 78.5% of 9th Ward 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, 79.5% of 9th Ward's footprint sits above 55 dBA, against a Delaware average of 38.3% and a national average of 28.1%.
What This Means if You're Moving to 9th Ward
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 9th Ward is under tree cover (heavier 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. Philadelphia International's approach paths concentrate aviation noise to the northeast. Neighborhoods to the southwest 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.
