This map shows modeled outdoor noise across Greenfield 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 801 Greenfield residents, or 21.7%, live above that level. By land area, 26.9% of Greenfield is above 55 dBA.
See how noise in Greenfield compares to similar-sized neighborhoods.
Noise by Part of Greenfield
Average noise levels for Greenfield residents, grouped by direction from the center of Greenfield. The highest population-weighted average is in southwestern Greenfield; the lowest is in northeastern Greenfield, where just 20% of residents live in blocks above the EPA's 55 dBA threshold, about two-thirds of the share in the loudest section.
Southwestern Greenfield
36% of people above 55 dBA
Southern Greenfield
32% of people above 55 dBA
Central Greenfield
25% of people above 55 dBA
Northern Greenfield
20% of people above 55 dBA
Northeastern Greenfield
20% of people above 55 dBA
To the human ear, noise in southwestern Greenfield sounds about 107% louder than in northeastern Greenfield, a 10.5 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 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 0% of Greenfield sits under tree canopy (much lighter than most neighborhoods) and roughly 32% 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.