Noise Levels in North Londonderry, NH | Find Quiet Neighborhoods With Our Sound Map
50 dBA
Average noise across North Londonderry
Quiet office
106
Residents above the EPA 55 dBA threshold
12% of North Londonderry residents
83 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across North Londonderry 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 106 North Londonderry residents, or 12.5%, live above that level. By land area, 12.9% of North Londonderry is above 55 dBA.
Average noise levels for North Londonderry residents, grouped by direction from the center of North Londonderry. Northern North Londonderry carries the highest population-weighted average; Eastern North Londonderry carries the lowest. Just 7% of residents in Eastern North Londonderry live in blocks above the EPA's 55 dBA threshold, a third of the share in Northern North Londonderry.
Eastern North Londonderry
47.6 dBA · Mostly quiet
Quiet office
7% of people above 55 dBA
QuietLoud
Northern North Londonderry
55.3 dBA · Moderate-loud
Quiet office to normal conversation
22% of people above 55 dBA
QuietLoud
Western North Londonderry
51.3 dBA · Moderate
Quiet office to normal conversation
15% of people above 55 dBA
QuietLoud
Northern North Londonderry sounds about 71% louder than Eastern North Londonderry to the human ear, a 7.7 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 do you need to be?
produces an estimated 83 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
83 dBA
Food blender at arm’s length
165 ft
68 dBA
Highway traffic 50 ft away
330 ft
59 dBA
Normal conversation an arm’s length away
660 ft
51 dBA
Quiet office to normal conversation
¼ mile
43 dBA
Quiet suburban street at night
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 65% of North Londonderry sits under tree canopy (much heavier than most cities) and roughly 0% 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
Manchester Boston Regional (MHT) sits west of North Londonderry. The U.S. Department of Transportation models aviation noise around this airport from federal traffic data, 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 55 dBA on the map's Overall layer. Blocks on the opposite side of North Londonderry, particularly to the east, 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 Londonderry
The bar chart below shows the share of North Londonderry residents in each noise band. About 86% of residents live below the EPA's 55 dBA threshold, and roughly 14% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How North Londonderry Compares
North Londonderry sits the highest among the peer group. Below: how North Londonderry's average outdoor noise and share of residents above the EPA threshold compare with Candia Four Corners, Dunbarton, Dunbarton Center, and Deerfield Parade.
Average noise level (dBA)
North Londonderry's 50.5 dBA pop-weighted average is the highest among the peer group. New Hampshire as a whole averages 48.7 dBA and the U.S. averages 52.0 dBA. Both are lower than North Londonderry because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 12.5% of North Londonderry 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, 12.9% of North Londonderry's footprint sits above 55 dBA, against a New Hampshire average of 18.7% and a national average of 28.1%.
What This Means if You're Moving to North Londonderry
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 65% of North Londonderry is under tree cover (much heavier than most cities), and the dominant land cover is mixed forest. 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. Manchester Boston Regional's approach paths concentrate aviation noise to the west. Neighborhoods to the east 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.
