Noise Levels in North Potomac, MD | Find Quiet Neighborhoods With Our Sound Map
50 dBA
Average noise across North Potomac
Quiet office
2,722
Residents above the EPA 55 dBA threshold
16% of North Potomac residents
64 dBA
Loudest residential point
Busy restaurant
This map shows modeled outdoor noise across North Potomac 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 2,722 North Potomac residents, or 16.2%, live above that level. By land area, 22.2% of North Potomac is above 55 dBA.
Average noise levels for North Potomac residents, grouped by direction from the center of North Potomac. Eastern North Potomac carries the highest population-weighted average; Central North Potomac carries the lowest. Just 9% of residents in Central North Potomac live in blocks above the EPA's 55 dBA threshold, about half the share in Eastern North Potomac.
Central North Potomac
49.3 dBA · Mostly quiet
Quiet office
9% of people above 55 dBA
QuietLoud
Eastern North Potomac
51.5 dBA · Moderate
Quiet office to normal conversation
20% of people above 55 dBA
QuietLoud
Northern North Potomac
50.7 dBA · Moderate
Quiet office
20% of people above 55 dBA
QuietLoud
Southern North Potomac
50.3 dBA · Moderate
Quiet office
14% of people above 55 dBA
QuietLoud
Western North Potomac
49.4 dBA · Mostly quiet
Quiet office
14% of people above 55 dBA
QuietLoud
Eastern North Potomac sounds about 16% louder than Central North Potomac to the human ear, a 2.2 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.
How far back from do you need to be?
produces an estimated 64 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
64 dBA
Busy restaurant
165 ft
52 dBA
Quiet office to normal conversation
330 ft
44 dBA
Quiet suburban street at night
660 ft
37 dBA
Soft rainfall
¼ mile
35 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 50% of North Potomac sits under tree canopy (heavier than most cities) and roughly 26% 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
Washington Dulles International (IAD) sits southwest of North Potomac. 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 North Potomac, particularly to the northeast, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across North Potomac
The bar chart below shows the share of North Potomac residents in each noise band. About 98% 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 North Potomac Compares
North Potomac sits the lowest among the peer group. Below: how North Potomac's average outdoor noise and share of residents above the EPA threshold compare with Glenmont, Cloverly, Fairland, and Clarksburg.
Average noise level (dBA)
North Potomac's 50.4 dBA pop-weighted average is the lowest among the peer group. Maryland as a whole averages 52.3 dBA and the U.S. averages 52.0 dBA. Both are lower than North Potomac because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 16.2% of North Potomac residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's fewer than any of its peer group. Measured by land area instead, 22.2% of North Potomac'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 North Potomac
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 50% of North Potomac is under tree cover (heavier than most 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. Washington Dulles International's approach paths concentrate aviation noise to the southwest. Neighborhoods to the northeast 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.
