This map shows modeled outdoor noise across St. Augustine South 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 1,369 St. Augustine South residents, or 31.5%, live above that level. By land area, 33.7% of St. Augustine South is above 55 dBA.
See how noise in St. Augustine South compares to similar-sized cities.
Noise by Part of St. Augustine South
Average noise levels for St. Augustine South residents, grouped by direction from the center of St. Augustine South. Western St. Augustine South carries the highest population-weighted average; Southern St. Augustine South carries the lowest. Just 25% of residents in Southern St. Augustine South live in blocks above the EPA's 55 dBA threshold, about two-thirds of the share in Western St. Augustine South.
Central St. Augustine South
35% of people above 55 dBA
Eastern St. Augustine South
35% of people above 55 dBA
Northern St. Augustine South
33% of people above 55 dBA
Southern St. Augustine South
25% of people above 55 dBA
Western St. Augustine South
42% of people above 55 dBA
Western St. Augustine South sounds about 10% louder than Southern St. Augustine South to the human ear, a 1.4 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 68 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 27% of St. Augustine South sits under tree canopy (about average for cities) and roughly 27% 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.