This map shows modeled outdoor noise across St. Martin 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 2 St. Martin residents, or 1.7%, live above that level. By land area, 1.0% of St. Martin is above 55 dBA.
See how noise in St. Martin compares to similar-sized cities.
Noise by Part of St. Martin
Average noise levels for St. Martin residents, grouped by direction from the center of St. Martin. Western St. Martin carries the highest population-weighted average; Central St. Martin carries the lowest. Just 0% of residents in Central St. Martin live in blocks above the EPA's 55 dBA threshold, a fraction of the share in Western St. Martin.
Central St. Martin
0% of people above 55 dBA
Northern St. Martin
2% of people above 55 dBA
Southern St. Martin
3% of people above 55 dBA
Western St. Martin
0% of people above 55 dBA
Western St. Martin sounds about 21% louder than Central St. Martin to the human ear, a 2.8 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 Anderson State Rd do you need to be?
Anderson State Rd produces an estimated 55 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 8% of St. Martin sits under tree canopy (lighter 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.