Noise Levels in Downtown, Honolulu, HI | Find Quiet Neighborhoods With Our Sound Map
68 dBA
Average noise across Downtown
Highway traffic 50 ft away
6,089
Residents above the EPA 55 dBA threshold
99% of Downtown residents
82 dBA
Loudest residential point
Food blender at arm’s length
This map shows modeled outdoor noise across Downtown 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.
Overall
Road
Rail
Aviation
Click the map to explore
35 dBa55 dBa (EPA limit)90+ dBa
3545557090
Quietest (dBA)Loudest
Colorblind friendlyoff
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 6,089 Downtown residents, or 99.4%, live above that level. By land area, 97.8% of Downtown is above 55 dBA.
Average noise levels for Downtown residents, grouped by direction from the center of Downtown. Western Downtown carries the highest population-weighted average; Southern Downtown carries the lowest. Just 94% of residents in Southern Downtown live in blocks above the EPA's 55 dBA threshold, roughly the same as the share in Western Downtown.
Central Downtown
68.5 dBA · Loud
Highway traffic 50 ft away
100% of people above 55 dBA
QuietLoud
Eastern Downtown
70.0 dBA · Loud
Highway traffic 50 ft away
100% of people above 55 dBA
QuietLoud
Northern Downtown
66.2 dBA · Loud
Highway traffic 50 ft away
100% of people above 55 dBA
QuietLoud
Southern Downtown
63.7 dBA · Loud
Busy restaurant
94% of people above 55 dBA
QuietLoud
Western Downtown
71.4 dBA · Loud
City bus interior
100% of people above 55 dBA
QuietLoud
Western Downtown sounds about 71% louder than Southern Downtown to the human ear, a 7.7 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 do you need to be?
produces an estimated 82 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 office.
At source
82 dBA
Food blender at arm’s length
165 ft
69 dBA
Highway traffic 50 ft away
330 ft
61 dBA
Busy restaurant
660 ft
54 dBA
Quiet office to normal conversation
¼ mile
46 dBA
Quiet office
½ mile
39 dBA
Soft rainfall
Calculated from the model's calibrated attenuation formula. About 0% of Downtown sits under tree canopy (about average for neighborhoods) and roughly 0% 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
Daniel K Inouye International (HNL) sits west of Downtown. 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 60 dBA on the map's Overall layer. Blocks on the opposite side of Downtown, 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 Downtown
The bar chart below shows the share of Downtown residents in each noise band. About 0% of residents live below the EPA's 55 dBA threshold, and roughly 100% live in blocks above 60 dBA. Long-term exposure in that range is linked to elevated stress hormones and cardiovascular risk.
How Downtown Compares
Downtown sits the highest among the peer group. Below: how Downtown's average outdoor noise and share of residents above the EPA threshold compare with The Arts District, Pearl Highlands, Moanalua, and Palolo.
Average noise level (dBA)
Downtown's 67.6 dBA pop-weighted average is the highest among the peer group. Hawaii as a whole averages 54.8 dBA and the U.S. averages 52.0 dBA. Both are lower than Downtown because most of either area is rural land away from major roads.
Share of residents above 55 dBA
About 99.4% of Downtown residents live in blocks where outdoor levels exceed the EPA's 55 dBA threshold. That's in the middle of its peer group. Measured by land area instead, 97.8% of Downtown's footprint sits above 55 dBA, against a Hawaii average of 34.4% and a national average of 28.1%.
What This Means if You're Moving to Downtown
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 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 0% of Downtown is under tree cover (about average for neighborhoods), and the dominant land cover is . 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. Daniel K Inouye International's approach paths concentrate aviation noise to the west. Neighborhoods to the east of downtown show no measurable contribution from the airport.
Sources & Methodology
The BestNeighborhood noise model is calibrated against nearly one million federal ground-truth measurements across four states. Road noise is computed from segment-level federal traffic data and propagated outward using physics-based acoustic decay, with attenuation rates that depend on the surrounding land cover.
All inputs are published federal datasets. Block-level noise is computed by combining road, rail, and aviation sound sources in the energy domain, the same physics used in professional environmental noise assessments. Read the full methodology.
