Noise Levels in 21875, MD | Find Quiet Neighborhoods With Our Sound Map
48 dBA
Average noise across 21875
Quiet office
997
Residents above the EPA 55 dBA threshold
16% of 21875 residents
71 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across 21875 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 997 21875 residents, or 16.0%, live above that level. By land area, 21.2% of 21875 is above 55 dBA.
Average noise levels for 21875 residents, grouped by direction from the center of 21875. Central 21875 carries the highest population-weighted average; Eastern 21875 carries the lowest. Just 3% of residents in Eastern 21875 live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Central 21875.
Central 21875
54.5 dBA · Moderate-loud
Quiet office to normal conversation
20% of people above 55 dBA
QuietLoud
Eastern 21875
43.8 dBA · Quiet
Quiet suburban street at night
3% of people above 55 dBA
QuietLoud
Northern 21875
51.8 dBA · Moderate
Quiet office to normal conversation
31% of people above 55 dBA
QuietLoud
Southern 21875
49.2 dBA · Mostly quiet
Quiet office
17% of people above 55 dBA
QuietLoud
Western 21875
48.4 dBA · Mostly quiet
Quiet office
14% of people above 55 dBA
QuietLoud
Central 21875 sounds about 110% louder than Eastern 21875 to the human ear, a 10.7 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 Sr54e do you need to be?
Sr54e produces an estimated 60 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
60 dBA
Normal conversation an arm’s length away
165 ft
47 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 36% of 21875 sits under tree canopy (heavier than most zip codes) and roughly 21% 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 21875. 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 21875
The bar chart below shows the share of 21875 residents in each noise band. About 86% of residents live below the EPA's 55 dBA threshold, and roughly 2% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How 21875 Compares
21875 sits at the quieter end of the spectrum. Below: how 21875's average outdoor noise and share of residents above the EPA threshold compare with 19940, 19939, 19945, and 19970.
Average noise level (dBA)
21875's 48.5 dBA pop-weighted average is at the quieter end of the spectrum. Maryland as a whole averages 52.3 dBA and the U.S. averages 52.0 dBA. Both are lower than 21875 because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 16.0% of 21875 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, 21.2% of 21875'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 21875
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 Sr54e 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 36% of 21875 is under tree cover (heavier than most zip codes), 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.
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.
