Descanso Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in Descanso is poor. AQI and PM10 are poor; PM2.5 is moderate; O3 is fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (PM10: 62.9/100).
Air Quality Tomorrow
Tomorrow (7 October 2026): Air quality in Descanso is poor. All pollutants stay as today. Pollution peaks around 9:00 AM (PM10: 61.7/100).
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Air Quality
Today - 6 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Poor | 62.9/100 |
| PM2.5 (fine particles) | Moderate | 46.1/100 |
| PM10 (coarse particles) | Poor | 62.9/100 |
| NO2 (nitrogen dioxide) | Good | 6.0/100 |
| O3 (ozone) | Fair | 25.7/100 |
| SO2 (sulfur dioxide) | Good | 1.3/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.8/100 |
| PM1 (ultrafine particles) | Good | 6.2/100 |
Tomorrow - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Poor | 61.7/100 |
| PM2.5 (fine particles) | Moderate | 45.4/100 |
| PM10 (coarse particles) | Poor | 61.7/100 |
| NO2 (nitrogen dioxide) | Good | 6.4/100 |
| O3 (ozone) | Fair | 22.3/100 |
| SO2 (sulfur dioxide) | Good | 2.1/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 0.8/100 |
| PM1 (ultrafine particles) | Good | 6.2/100 |
Local Environmental Conditions
With little dense development around the center of Descanso, local traffic emissions are modest. Dust raised by wind from dry, open ground is a recurring source of coarse particles. Woodland in the area offers some natural filtering of particles from traffic. Pollution carried in from the wider region can also raise levels at times.
Summer sun from June to September cooks traffic fumes into ozone, especially in the warmest month, which averages 26°C. Cooler, still evenings from January to March, averaging about 11°C, tend to hold exhaust close to busy streets. The dry months, April to October, bring more dust whenever the wind picks up. Wildfire smoke is most likely from May to October, sometimes turning the sky hazy for days.
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Frequently Asked Questions About Air Quality in California
Is air quality bad in Descanso right now?
On 6 October 2026, overall air quality in Descanso is poor. AQI is the main air quality indicator at 62.9/100. Pollution peaks around 9:00 AM (PM10: 62.9/100).
Will air quality be worse tomorrow in Descanso?
On 7 October 2026, air quality conditions in Descanso will be similar to today, with AQI forecast at poor at 61.7/100. Pollution peaks around 9:00 AM (PM10: 61.7/100).
When is air pollution at its worst in Descanso?
Summer sun from June to September cooks traffic fumes into ozone, especially in the warmest month, which averages 26°C. Cooler, still evenings from January to March, averaging about 11°C, tend to hold exhaust close to busy streets. The dry months, April to October, bring more dust whenever the wind picks up. Wildfire smoke is most likely from May to October, sometimes turning the sky hazy for days.
Are air quality levels in Descanso 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. |