Noise Levels in Cobb Island, MD | Find Quiet Neighborhoods With Our Sound Map
53 dBA
Average noise across Cobb Island
Quiet office to normal conversation
239
Residents above the EPA 55 dBA threshold
38% of Cobb Island residents
68 dBA
Loudest residential point
Highway traffic 50 ft away
This map shows modeled outdoor noise across Cobb Island 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 239 Cobb Island residents, or 37.5%, live above that level. By land area, 39.8% of Cobb Island is above 55 dBA.
Average noise levels for Cobb Island residents, grouped by direction from the center of Cobb Island. Southern Cobb Island carries the highest population-weighted average; Northern Cobb Island carries the lowest. Just 3% of residents in Northern Cobb Island live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Southern Cobb Island.
Central Cobb Island
52.3 dBA · Moderate
Quiet office to normal conversation
33% of people above 55 dBA
QuietLoud
Eastern Cobb Island
51.7 dBA · Moderate
Quiet office to normal conversation
24% of people above 55 dBA
QuietLoud
Northern Cobb Island
49.0 dBA · Mostly quiet
Quiet office
3% of people above 55 dBA
QuietLoud
Southern Cobb Island
55.0 dBA · Moderate-loud
Quiet office to normal conversation
46% of people above 55 dBA
QuietLoud
Western Cobb Island
53.3 dBA · Moderate-loud
Quiet office to normal conversation
60% of people above 55 dBA
QuietLoud
Southern Cobb Island sounds about 52% louder than Northern Cobb Island to the human ear, a 6.0 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.
How far back from do you need to be?
produces an estimated 68 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
68 dBA
Highway traffic 50 ft away
165 ft
55 dBA
Quiet office to normal conversation
330 ft
48 dBA
Quiet office
660 ft
40 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 29% of Cobb Island sits under tree canopy (about average for cities) and roughly 12% 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 Cobb Island. 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.
How Noise Is Distributed Across Cobb Island
The bar chart below shows the share of Cobb Island residents in each noise band. About 61% of residents live below the EPA's 55 dBA threshold, and roughly 0% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Cobb Island Compares
Cobb Island sits the highest among the peer group. Below: how Cobb Island's average outdoor noise and share of residents above the EPA threshold compare with Bushwood, Avenue, Compton, and Potomac Shores.
Average noise level (dBA)
Cobb Island's 53.0 dBA pop-weighted average is the highest among the peer group. Maryland as a whole averages 52.3 dBA and the U.S. averages 52.0 dBA. Both are lower than Cobb Island because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 37.5% of Cobb Island residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's more than any of its peer group. Measured by land area instead, 39.8% of Cobb Island's footprint sits above 55 dBA, against a Maryland average of 32.9% and a national average of 28.1%.
What This Means if You're Moving to Cobb Island
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 29% of Cobb Island is under tree cover (about average for cities), and the dominant land cover is low-density developed open space. 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.
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.
