Noise Levels in Trowbridge Square, Sandy Springs, GA | Find Quiet Neighborhoods With Our Sound Map
54 dBA
Average noise across Trowbridge Square
Quiet office to normal conversation
1,110
Residents above the EPA 55 dBA threshold
27% of Trowbridge Square residents
78 dBA
Loudest residential point
City bus interior
This map shows modeled outdoor noise across Trowbridge Square 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.
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 1,110 Trowbridge Square residents, or 26.6%, live above that level. By land area, 26.6% of Trowbridge Square is above 55 dBA.
73.4% below 55 dBA
26.6% above 55 dBA
See how noise in Trowbridge Square compares to similar-sized neighborhoods.
Noise by Part of Trowbridge Square
Average noise levels for Trowbridge Square residents, grouped by direction from the center of Trowbridge Square. The highest population-weighted average is in eastern Trowbridge Square; the lowest is in western Trowbridge Square, where just 2% of residents live in blocks above the EPA's 55 dBA threshold, a fifth of the share in the loudest section.
Eastern Trowbridge Square
62.0 dBA · Loud
Busy restaurant
Central Trowbridge Square
56.5 dBA · Moderate-loud
Normal conversation an arm’s length away
Western Trowbridge Square
43.5 dBA · Quiet
Quiet suburban street at night
To the human ear, noise in eastern Trowbridge Square sounds about 261% louder than in western Trowbridge Square, a 18.5 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 78 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
78 dBA
City bus interior
165 ft
65 dBA
Busy restaurant
330 ft
58 dBA
Normal conversation an arm’s length away
660 ft
50 dBA
Quiet office
¼ mile
42 dBA
Quiet suburban street at night
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 51% of Trowbridge Square sits under tree canopy (much heavier than most neighborhoods) and roughly 22% 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.
-->
Airport Noise
Hartsfield/Jackson Atlanta International (ATL) sits south of Trowbridge Square. The U.S. Department of Transportation measures aviation noise around this airport directly, 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 75 dBA on the map's Overall layer. Blocks on the opposite side of Trowbridge Square, 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 Trowbridge Square
The bar chart below shows the share of Trowbridge Square residents in each noise band. About 28% of residents live below the EPA's 55 dBA threshold, and roughly 16% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Trowbridge Square Compares
Trowbridge Square sits at the quieter end of the spectrum. Below: how Trowbridge Square's average outdoor noise and share of residents above the EPA threshold compare with Perimeter Center, The Meadows, Crabapple, and Villas at Norcross.
Average noise level (dBA)
Trowbridge Square's 54.5 dBA pop-weighted average is at the quieter end of the spectrum. Georgia as a whole averages 51.0 dBA and the U.S. averages 52.0 dBA. Both are lower than Trowbridge Square because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 26.6% of Trowbridge Square 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, 26.6% of Trowbridge Square's footprint sits above 55 dBA, against a Georgia average of 22.6% and a national average of 28.1%.
What This Means if You're Moving to Trowbridge Square
- 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 51% of Trowbridge Square is under tree cover (much heavier than most neighborhoods), and the dominant land cover is low-density developed open space. 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. Hartsfield/Jackson Atlanta International's approach paths concentrate aviation noise to the south. Neighborhoods to the north of downtown show no measurable contribution from the airport.
