This map shows modeled outdoor noise across Red Hill 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 559 Red Hill residents, or 27.6%, live above that level. By land area, 33.3% of Red Hill is above 55 dBA.
See how noise in Red Hill compares to similar-sized cities.
Noise by Part of Red Hill
Average noise levels for Red Hill residents, grouped by direction from the center of Red Hill. Central Red Hill carries the highest population-weighted average; Eastern Red Hill carries the lowest. Just 6% of residents in Eastern Red Hill live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Central Red Hill.
Central Red Hill
43% of people above 55 dBA
Eastern Red Hill
6% of people above 55 dBA
Northern Red Hill
0% of people above 55 dBA
Southern Red Hill
26% of people above 55 dBA
Western Red Hill
23% of people above 55 dBA
Central Red Hill sounds about 99% louder than Eastern Red Hill to the human ear, a 9.9 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 Main St do you need to be?
Main St produces an estimated 62 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 25% of Red Hill sits under tree canopy (about average for cities) and roughly 41% 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.