This map shows modeled outdoor noise across Southwood 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 1,678 Southwood residents, or 48.8%, live above that level. By land area, 58.6% of Southwood is above 55 dBA.
See how noise in Southwood compares to similar-sized neighborhoods.
Noise by Part of Southwood
Average noise levels for Southwood residents, grouped by direction from the center of Southwood. Southern Southwood carries the highest population-weighted average; Eastern Southwood carries the lowest. Just 0% of residents in Eastern Southwood live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Southern Southwood.
Central Southwood
47% of people above 55 dBA
Eastern Southwood
0% of people above 55 dBA
Northern Southwood
0% of people above 55 dBA
Southern Southwood
68% of people above 55 dBA
Western Southwood
88% of people above 55 dBA
Southern Southwood sounds about 366% louder than Eastern Southwood to the human ear, a 22.2 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 State Hwy 9 A do you need to be?
State Hwy 9 A produces an estimated 72 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.
Calculated from the model's calibrated attenuation formula. About 13% of Southwood sits under tree canopy (about average for neighborhoods) and roughly 33% 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.