Los Angeles noise map by address: check any home
Modeled estimates for general information only — not measurements, not a guarantee, and not for legal, medical or real-estate decisions.
Quiet LA is a free noise map for Los Angeles County. Type an address and the map jumps to that building and shows its modeled outdoor noise level for day, evening, night and the full 24 hours.
How to look up the noise level at an address
- Open the noise map and type a street address in the search box, for example 200 N Spring St, Los Angeles. Any address in LA County works.
- Choose the matching suggestion. With a house number the map selects that building; with only a street name it moves to the street.
- Read the level in the place panel. For a building the map shows the loudest wall, and the panel also shows the least exposed wall.
- Switch between Day, Evening, Night and 24 h to compare the same building at different times.
- Click nearby buildings or zoom out to compare streets. A difference of a few dB between two addresses is within the model’s error.
The address search runs in your browser against LA County’s public GIS service. Quiet LA does not receive or store the address. See Privacy.
What Day, Evening, Night and 24 h CNEL mean
- Day is 7 am to 7 pm.
- Evening is 7 to 10 pm.
- Night is 10 pm to 7 am.
- 24 h is CNEL, the Community Noise Equivalent Level. It is one number for the whole day, with evening counted 5 dB higher and night 10 dB higher than day, because noise is harder to ignore at those hours.
Day, Evening and Night are average sound levels (LAeq) in decibels for each period. They are taken at a point 4 m up and 2 m out from a building wall, or 1.5 m above open ground.
Only the 24 h view adds aircraft: an estimate derived from official airport contours. Switch Aircraft off to remove it from the 24 h value. See LAX and aircraft noise.
What “modeled” means
The levels come from a computer model, not from microphones. For every street, the model takes how many vehicles pass, how fast they go and how many are trucks. It then calculates how the sound spreads over the ground, around buildings and past freeway sound walls. Trains, including horns at public crossings, are added on the Ventura and Valley main lines.
Where no traffic count exists, the model uses typical values for that kind of road. Parks, mountains and desert get a coarse estimate from freeways and major roads only. The map colors also include a low hum from distant freeways and major roads; it is not in the values for a single address. At a single address the estimate is typically about 6 dB off, higher or lower. The number is the model’s estimate at the building, not a forecast of what you will hear on any given night.
See How it’s made for the method and Sources & methods for every data source.
What the map does not show
- Indoor levels. Windows, floors and insulation change what you hear inside.
- Construction, events, nightlife, neighbors, helicopters and sirens.
- A computed level for land with no freeway or major road within 3 km. That land shows the lowest color; that is an assumption, not a computed value. Other blank areas are not modeled yet, and blank never means quiet.
Quiet LA is not a measurement and is not for legal, medical or real-estate decisions. See Limits.
Compare noise sources, not neighborhoods
The map describes noise sources and modeled levels at specific places. It does not rate or rank neighborhoods. To compare options, look up each address you are considering and note which sources matter there: a freeway, a busy street, a rail line or a flight path.