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.
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.
77.8% below 55 dBA
22.2% above 55 dBA
See how noise in North Potomac compares to similar-sized cities.
Noise by Part of North Potomac
Average noise levels for North Potomac residents, grouped by direction from the center of North Potomac. The highest population-weighted average is in eastern North Potomac; the lowest is in southern North Potomac, where just 7% of residents live in blocks above the EPA's 55 dBA threshold, a third of the share in the loudest section.
Eastern North Potomac
52.6 dBA · Moderate
Quiet office to normal conversation
Southeastern North Potomac
51.7 dBA · Moderate
Quiet office to normal conversation
Northwestern North Potomac
50.8 dBA · Moderate
Quiet office
Southwestern North Potomac
48.3 dBA · Mostly quiet
Quiet office
Southern North Potomac
48.2 dBA · Mostly quiet
Quiet office
To the human ear, noise in eastern North Potomac sounds about 36% louder than in southern North Potomac, a 4.4 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.
