This map shows modeled outdoor noise across 84722 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 90 84722 residents, or 13.7%, live above that level. By land area, 11.9% of 84722 is above 55 dBA.
See how noise in 84722 compares to similar-sized zip codes.
Noise by Part of 84722
Average noise levels for 84722 residents, grouped by direction from the center of 84722. Northern 84722 carries the highest population-weighted average; Eastern 84722 carries the lowest. Just 3% of residents in Eastern 84722 live in blocks above the EPA's 55 dBA threshold, a fifth of the share in Northern 84722.
Central 84722
16% of people above 55 dBA
Eastern 84722
3% of people above 55 dBA
Northern 84722
21% of people above 55 dBA
Southern 84722
18% of people above 55 dBA
Western 84722
12% of people above 55 dBA
Northern 84722 sounds about 99% louder than Eastern 84722 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 Hwy 18 do you need to be?
Hwy 18 produces an estimated 59 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 10% of 84722 sits under tree canopy (lighter than most zip codes) and roughly 7% 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.