This map shows modeled outdoor noise across Errol 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 Errol residents, or 0.4%, live above that level. By land area, 0.9% of Errol is above 55 dBA.
See how noise in Errol compares to similar-sized cities.
Noise by Part of Errol
Average noise levels for Errol residents, grouped by direction from the center of Errol. Western Errol carries the highest population-weighted average; Northern Errol carries the lowest. Just 1% of residents in Northern Errol live in blocks above the EPA's 55 dBA threshold, roughly the same as the share in Western Errol.
Eastern Errol
0% of people above 55 dBA
Northern Errol
1% of people above 55 dBA
Southern Errol
0% of people above 55 dBA
Western Errol
0% of people above 55 dBA
Western Errol sounds about 225% louder than Northern Errol to the human ear, a 17.0 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 58 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 67% of Errol sits under tree canopy (much heavier than most cities) and roughly 4% 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.