This map shows modeled outdoor noise across Carquinez Heights 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 3,139 Carquinez Heights residents, or 54.5%, live above that level. By land area, 51.8% of Carquinez Heights is above 55 dBA.
See how noise in Carquinez Heights compares to similar-sized neighborhoods.
Noise by Part of Carquinez Heights
Average noise levels for Carquinez Heights residents, grouped by direction from the center of Carquinez Heights. The highest population-weighted average is in northern Carquinez Heights; the lowest is in western Carquinez Heights, where just 5% of residents live in blocks above the EPA's 55 dBA threshold, a fifth of the share in the loudest section.
Northern Carquinez Heights
38% of people above 55 dBA
Northwestern Carquinez Heights
48% of people above 55 dBA
Central Carquinez Heights
48% of people above 55 dBA
Southeastern Carquinez Heights
9% of people above 55 dBA
Western Carquinez Heights
5% of people above 55 dBA
To the human ear, noise in northern Carquinez Heights sounds about 266% louder than in western Carquinez Heights, a 18.7 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 I-80 do you need to be?
I-80 produces an estimated 79 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 7% of Carquinez Heights sits under tree canopy (lighter than most neighborhoods) and roughly 58% 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.