Noise Levels in 92021, CA | Find Quiet Neighborhoods With Our Sound Map
56 dBA
Average noise across 92021
Normal conversation an arm’s length away
33,234
Residents above the EPA 55 dBA threshold
50% of 92021 residents
83 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across 92021 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 33,234 92021 residents, or 49.8%, live above that level. By land area, 50.6% of 92021 is above 55 dBA.
49.4% below 55 dBA
50.6% above 55 dBA
See how noise in 92021 compares to similar-sized zip codes.
Noise by Part of 92021
Average noise levels for 92021 residents, grouped by direction from the center of 92021. The highest population-weighted average is in southern 92021; the lowest is in southeastern 92021, where just 12% of residents live in blocks above the EPA's 55 dBA threshold, a fifth of the share in the loudest section.
Southern 92021
66.9 dBA · Loud
Highway traffic 50 ft away
Western 92021
62.5 dBA · Loud
Busy restaurant
Northwestern 92021
56.5 dBA · Moderate-loud
Normal conversation an arm’s length away
Eastern 92021
51.1 dBA · Moderate
Quiet office to normal conversation
Southeastern 92021
50.5 dBA · Moderate
Quiet office
To the human ear, noise in southern 92021 sounds about 212% louder than in southeastern 92021, a 16.4 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-8 do you need to be?
I-8 produces an estimated 78 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 quiet suburban street at night.
At source
78 dBA
City bus interior
165 ft
65 dBA
Busy restaurant
330 ft
58 dBA
Normal conversation an arm’s length away
660 ft
50 dBA
Quiet office
¼ mile
43 dBA
Quiet suburban street at night
½ mile
35 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 3% of 92021 sits under tree canopy (much lighter than most zip codes) and roughly 43% 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.
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Airport Noise
San Diego International (SAN) sits west of 92021. The U.S. Department of Transportation measures aviation noise around this airport directly, and the model uses those federal measurements rather than synthetic predictions.
Blocks under the approach and departure paths carry combined road-plus-aviation noise, with some exceeding 80 dBA on the map's Overall layer. Blocks on the opposite side of 92021, particularly to the east, show no measurable aviation contribution. Use the Aviation toggle on the map above to isolate the airport's footprint.
How Noise Is Distributed Across 92021
The bar chart below shows the share of 92021 residents in each noise band. About 46% of residents live below the EPA's 55 dBA threshold, and roughly 25% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How 92021 Compares
92021 sits the highest among the peer group. Below: how 92021's average outdoor noise and share of residents above the EPA threshold compare with 92020, 92071, 92114, and 91977.
Average noise level (dBA)
92021's 56.3 dBA pop-weighted average is the highest among the peer group. California as a whole averages 54.0 dBA and the U.S. averages 52.0 dBA. Both are lower than 92021 because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 49.8% of 92021 residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's more than any of its peer group. Measured by land area instead, 50.6% of 92021's footprint sits above 55 dBA, against a California average of 36.0% and a national average of 28.1%.
What This Means if You're Moving to 92021
- Distance from highways matters more than the neighborhood name. Two homes in the same zip code can differ by 20 dBA if one sits 100 meters from I-8 and the other 500 meters away. The model captures this at 100-meter resolution, so noise exposure changes block by block.
- Tree canopy can help reduce modeled noise exposure. Roughly 3% of 92021 is under tree cover (much lighter than most zip codes), and the dominant land cover is medium-intensity developed land. Both are measured from federal USDA Forest Service and USGS satellite imagery at 30-meter resolution. Streets with 60% or higher canopy show 3 to 5 dBA lower noise than comparable streets with bare ground or pavement, which is why the per-place decay rate above already accounts for it.
- Airport noise is directional. San Diego International's approach paths concentrate aviation noise to the west. Neighborhoods to the east of downtown show no measurable contribution from the airport.
