Noise Levels in 21047, MD | Find Quiet Neighborhoods With Our Sound Map
48 dBA
Average noise across 21047
Quiet office
1,121
Residents above the EPA 55 dBA threshold
9% of 21047 residents
75 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across 21047 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 1,121 21047 residents, or 8.8%, live above that level. By land area, 11.5% of 21047 is above 55 dBA.
Average noise levels for 21047 residents, grouped by direction from the center of 21047. Central 21047 carries the highest population-weighted average; Western 21047 carries the lowest. Just 5% of residents in Western 21047 live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Central 21047.
Central 21047
53.1 dBA · Moderate-loud
Quiet office to normal conversation
29% of people above 55 dBA
QuietLoud
Eastern 21047
50.0 dBA · Moderate
Quiet office
14% of people above 55 dBA
QuietLoud
Northern 21047
47.6 dBA · Mostly quiet
Quiet office
5% of people above 55 dBA
QuietLoud
Southern 21047
49.0 dBA · Mostly quiet
Quiet office
8% of people above 55 dBA
QuietLoud
Western 21047
47.0 dBA · Mostly quiet
Quiet office
5% of people above 55 dBA
QuietLoud
Central 21047 sounds about 53% louder than Western 21047 to the human ear, a 6.1 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 75 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 quiet suburban street at night.
At source
75 dBA
City bus interior
165 ft
63 dBA
Busy restaurant
330 ft
56 dBA
Normal conversation an arm’s length away
660 ft
49 dBA
Quiet office
¼ mile
42 dBA
Quiet suburban street at night
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 39% of 21047 sits under tree canopy (heavier than most zip codes) and roughly 10% 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
Baltimore/Washington International Thurgood Marshall (BWI) sits southwest of 21047. 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 21047, 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 21047
The bar chart below shows the share of 21047 residents in each noise band. About 91% 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 21047 Compares
21047 sits the lowest among the peer group. Below: how 21047's average outdoor noise and share of residents above the EPA threshold compare with 21128, 21050, 21085, and 21210.
Average noise level (dBA)
21047's 48.5 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 21047 because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 8.8% of 21047 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, 11.5% of 21047'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 21047
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 39% of 21047 is under tree cover (heavier than most zip codes), 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.
Airport noise is directional. Baltimore/Washington International Thurgood Marshall'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.
