Noise Levels in Straw-Smyth, Manchester, NH | Find Quiet Neighborhoods With Our Sound Map
57 dBA
Average noise across Straw-Smyth
Normal conversation an arm’s length away
3,738
Residents above the EPA 55 dBA threshold
75% of Straw-Smyth residents
77 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across Straw-Smyth 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
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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 3,738 Straw-Smyth residents, or 74.9%, live above that level. By land area, 75.1% of Straw-Smyth is above 55 dBA.
Average noise levels for Straw-Smyth residents, grouped by direction from the center of Straw-Smyth. Western Straw-Smyth carries the highest population-weighted average; Eastern Straw-Smyth carries the lowest. Just 37% of residents in Eastern Straw-Smyth live in blocks above the EPA's 55 dBA threshold, about half the share in Western Straw-Smyth.
Central Straw-Smyth
56.3 dBA · Moderate-loud
Normal conversation an arm’s length away
63% of people above 55 dBA
QuietLoud
Eastern Straw-Smyth
53.7 dBA · Moderate-loud
Quiet office to normal conversation
37% of people above 55 dBA
QuietLoud
Northern Straw-Smyth
57.7 dBA · Moderate-loud
Normal conversation an arm’s length away
73% of people above 55 dBA
QuietLoud
Southern Straw-Smyth
58.6 dBA · Loud
Normal conversation an arm’s length away
99% of people above 55 dBA
QuietLoud
Western Straw-Smyth
59.9 dBA · Loud
Normal conversation an arm’s length away
96% of people above 55 dBA
QuietLoud
Western Straw-Smyth sounds about 54% louder than Eastern Straw-Smyth to the human ear, a 6.2 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 I-93 do you need to be?
I-93 produces an estimated 76 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
76 dBA
City bus interior
165 ft
62 dBA
Busy restaurant
330 ft
54 dBA
Quiet office to normal conversation
660 ft
46 dBA
Quiet suburban street at night
¼ mile
38 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 31% of Straw-Smyth sits under tree canopy (heavier than most neighborhoods) and roughly 49% 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 south of Straw-Smyth. 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 Straw-Smyth, particularly to the north, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across Straw-Smyth
The bar chart below shows the share of Straw-Smyth residents in each noise band. About 27% of residents live below the EPA's 55 dBA threshold, and roughly 29% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Straw-Smyth Compares
Straw-Smyth sits at the louder end of the spectrum. Below: how Straw-Smyth's average outdoor noise and share of residents above the EPA threshold compare with Rimmon Heights, North End Manchester, Wellington, and Somerville.
Average noise level (dBA)
Straw-Smyth's 57.3 dBA pop-weighted average is at the louder end of the spectrum. New Hampshire as a whole averages 48.7 dBA and the U.S. averages 52.0 dBA. Both are lower than Straw-Smyth because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 74.9% of Straw-Smyth 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, 75.1% of Straw-Smyth'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 Straw-Smyth
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 I-93 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 31% of Straw-Smyth is under tree cover (heavier than most neighborhoods), and the dominant land cover is medium-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. Manchester Boston Regional's approach paths concentrate aviation noise to the south. Neighborhoods to the north 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.
