Los Angeles Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Los Angeles is fair. AQI, PM2.5, PM10, and O3 are fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 AM (O3: 39.2/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Los Angeles is fair. All pollutants stay as today. Pollution peaks around 10:00 AM (PM2.5: 34.5/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 39.2/100 |
| PM2.5 (fine particles) | Fair | 22.4/100 |
| PM10 (coarse particles) | Fair | 26.6/100 |
| NO2 (nitrogen dioxide) | Good | 3.6/100 |
| O3 (ozone) | Fair | 39.2/100 |
| SO2 (sulfur dioxide) | Good | 0.6/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 1.5/100 |
| PM1 (ultrafine particles) | Good | 1.6/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 34.5/100 |
| PM2.5 (fine particles) | Fair | 34.5/100 |
| PM10 (coarse particles) | Fair | 34.2/100 |
| NO2 (nitrogen dioxide) | Good | 4.3/100 |
| O3 (ozone) | Fair | 33.0/100 |
| SO2 (sulfur dioxide) | Good | 0.7/100 |
| CO (carbon monoxide) | Good | 0.5/100 |
| HCHO (formaldehyde) | Good | 1.4/100 |
| PM1 (ultrafine particles) | Good | 2.5/100 |
Local Environmental Conditions
Around the heart of Los Angeles, traffic is light and there are few concentrated sources of air pollution. Lying in a basin at around 330 m, the area is prone to temperature inversions that hold pollutants near the ground when winds drop. Sea breezes along the coast usually help ventilate the area. Local sources include industry.
Hot afternoons from June to September, averaging 25°C in the warmest month, are when ozone is most likely to build up. Even in the mild winter months, January to March, at around 12°C, calm nights let traffic pollution settle in the basin. The risk of wildfire smoke peaks from April to October, when dry vegetation burns easily.
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Frequently Asked Questions About Air Quality in California
Is air quality bad in Los Angeles right now?
On 10 October 2026, overall air quality in Los Angeles is fair. AQI is the main air quality indicator at 39.2/100. Pollution peaks around 4:00 AM (O3: 39.2/100).
Will air quality be worse tomorrow in Los Angeles?
On 11 October 2026, air quality conditions in Los Angeles will be similar to today, with AQI forecast at fair at 34.5/100. Pollution peaks around 10:00 AM (PM2.5: 34.5/100).
When is air pollution at its worst in Los Angeles?
Hot afternoons from June to September, averaging 25°C in the warmest month, are when ozone is most likely to build up. Even in the mild winter months, January to March, at around 12°C, calm nights let traffic pollution settle in the basin. The risk of wildfire smoke peaks from April to October, when dry vegetation burns easily.
Are air quality levels in Los Angeles based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |