Noise Levels in North Otis, MA | Find Quiet Neighborhoods With Our Sound Map
50 dBA
Average noise across North Otis
Quiet office
35
Residents above the EPA 55 dBA threshold
10% of North Otis residents
79 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across North Otis 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 35 North Otis residents, or 9.8%, live above that level. By land area, 19.0% of North Otis is above 55 dBA.
Average noise levels for North Otis residents, grouped by direction from the center of North Otis. Eastern North Otis carries the highest population-weighted average; Northern North Otis carries the lowest. Just 2% of residents in Northern North Otis live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Eastern North Otis.
Eastern North Otis
56.1 dBA · Moderate-loud
Normal conversation an arm’s length away
13% of people above 55 dBA
QuietLoud
Northern North Otis
43.2 dBA · Quiet
Quiet suburban street at night
2% of people above 55 dBA
QuietLoud
Southern North Otis
45.8 dBA · Mostly quiet
Quiet suburban street at night
3% of people above 55 dBA
QuietLoud
Western North Otis
45.2 dBA · Mostly quiet
Quiet suburban street at night
9% of people above 55 dBA
QuietLoud
Eastern North Otis sounds about 145% louder than Northern North Otis to the human ear, a 12.9 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 Massachusetts Tpke do you need to be?
Massachusetts Tpke produces an estimated 74 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
74 dBA
City bus interior
165 ft
60 dBA
Normal conversation an arm’s length away
330 ft
52 dBA
Quiet office to normal conversation
660 ft
44 dBA
Quiet suburban street at night
¼ mile
36 dBA
Soft rainfall
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 60% of North Otis sits under tree canopy (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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How Noise Is Distributed Across North Otis
The bar chart below shows the share of North Otis residents in each noise band. About 65% of residents live below the EPA's 55 dBA threshold, and roughly 34% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How North Otis Compares
North Otis sits the highest among the peer group. Below: how North Otis's average outdoor noise and share of residents above the EPA threshold compare with Middlefield, Mill River, West Chesterfield, and Washington.
Average noise level (dBA)
North Otis's 49.9 dBA pop-weighted average is the highest among the peer group. Massachusetts as a whole averages 54.3 dBA and the U.S. averages 52.0 dBA. Both are lower than North Otis because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 9.8% of North Otis 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, 19.0% of North Otis's footprint sits above 55 dBA, against a Massachusetts average of 40.0% and a national average of 28.1%.
What This Means if You're Moving to North Otis
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 Massachusetts Tpke 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 60% of North Otis is under tree cover (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.
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.
