This map shows modeled outdoor noise across Isle of Palms 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 402 Isle of Palms residents, or 14.2%, live above that level. By land area, 18.1% of Isle of Palms is above 55 dBA.
See how noise in Isle of Palms compares to similar-sized neighborhoods.
Noise by Part of Isle of Palms
Average noise levels for Isle of Palms residents, grouped by direction from the center of Isle of Palms. Southern Isle of Palms carries the highest population-weighted average; Central Isle of Palms carries the lowest. Just 13% of residents in Central Isle of Palms live in blocks above the EPA's 55 dBA threshold, three-quarters of the share in Southern Isle of Palms.
Central Isle of Palms
13% of people above 55 dBA
Northern Isle of Palms
13% of people above 55 dBA
Southern Isle of Palms
16% of people above 55 dBA
Western Isle of Palms
0% of people above 55 dBA
Southern Isle of Palms sounds about 26% louder than Central Isle of Palms to the human ear, a 3.3 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 79 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.
Calculated from the model's calibrated attenuation formula. About 6% of Isle of Palms sits under tree canopy (lighter than most neighborhoods) and roughly 23% 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.