Noise Levels in East Merrimack, NH | Find Quiet Neighborhoods With Our Sound Map
54 dBA
Average noise across East Merrimack
Quiet office to normal conversation
1,550
Residents above the EPA 55 dBA threshold
33% of East Merrimack residents
78 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across East Merrimack 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 1,550 East Merrimack residents, or 33.0%, live above that level. By land area, 38.7% of East Merrimack is above 55 dBA.
Average noise levels for East Merrimack residents, grouped by direction from the center of East Merrimack. Southern East Merrimack carries the highest population-weighted average; Northern East Merrimack carries the lowest. Just 23% of residents in Northern East Merrimack live in blocks above the EPA's 55 dBA threshold, about half the share in Southern East Merrimack.
Central East Merrimack
53.1 dBA · Moderate-loud
Quiet office to normal conversation
28% of people above 55 dBA
QuietLoud
Northern East Merrimack
50.5 dBA · Moderate
Quiet office
23% of people above 55 dBA
QuietLoud
Southern East Merrimack
59.1 dBA · Loud
Normal conversation an arm’s length away
49% of people above 55 dBA
QuietLoud
Western East Merrimack
56.3 dBA · Moderate-loud
Normal conversation an arm’s length away
47% of people above 55 dBA
QuietLoud
Southern East Merrimack sounds about 82% louder than Northern East Merrimack to the human ear, a 8.6 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 Fe Everett Tpke North do you need to be?
Fe Everett Tpke North 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 soft rainfall.
At source
75 dBA
City bus interior
165 ft
62 dBA
Busy restaurant
330 ft
55 dBA
Quiet office to normal conversation
660 ft
47 dBA
Quiet office
¼ mile
40 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 37% of East Merrimack sits under tree canopy (about average for cities) and roughly 30% 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 northeast of East Merrimack. 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 East Merrimack, particularly to the southwest, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across East Merrimack
The bar chart below shows the share of East Merrimack residents in each noise band. About 58% of residents live below the EPA's 55 dBA threshold, and roughly 15% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How East Merrimack Compares
East Merrimack sits the highest among the peer group. Below: how East Merrimack's average outdoor noise and share of residents above the EPA threshold compare with Auburn, New Boston, Brookline, and Sandown.
Average noise level (dBA)
East Merrimack's 53.7 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 East Merrimack because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 33.0% of East Merrimack 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, 38.7% of East Merrimack'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 East Merrimack
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 Fe Everett Tpke North 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 37% of East Merrimack is under tree cover (about average for cities), 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 northeast. Neighborhoods to the southwest 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.
