East Pasadena Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in East Pasadena is very poor. AQI and PM10 are very poor; PM2.5 is moderate; O3 is fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (PM10: 82.9/100).
Air Quality Tomorrow
Tomorrow (7 October 2026): Air quality in East Pasadena is moderate. AQI improves to moderate; PM2.5 decreases to fair; PM10 decreases to moderate; all other pollutants stay as today. Pollution peaks around 8:00 AM (PM10: 47.4/100).
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Air Quality
Today - 6 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Very poor | 82.9/100 |
| PM2.5 (fine particles) | Moderate | 46.6/100 |
| PM10 (coarse particles) | Very poor | 82.9/100 |
| NO2 (nitrogen dioxide) | Good | 4.7/100 |
| O3 (ozone) | Fair | 24.0/100 |
| SO2 (sulfur dioxide) | Good | 1.4/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 1.0/100 |
| PM1 (ultrafine particles) | Good | 4.1/100 |
Tomorrow - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Moderate | 47.4/100 |
| PM2.5 (fine particles) | Fair | 33.4/100 |
| PM10 (coarse particles) | Moderate | 47.4/100 |
| NO2 (nitrogen dioxide) | Good | 10.4/100 |
| O3 (ozone) | Fair | 24.3/100 |
| SO2 (sulfur dioxide) | Good | 4.8/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 1.7/100 |
| PM1 (ultrafine particles) | Good | 3.9/100 |
Local Environmental Conditions
With buildings covering much of the area around the heart of East Pasadena, traffic and other urban emissions are the biggest local influence on air quality. The surrounding woodland releases natural compounds that, in warm sunny weather, help form ozone. On some days, pollution drifting in from farther away outweighs local sources.
Air near roads is often at its worst from January to March, when nights cool to around 12°C and the air turns still. From June to September, strong sunshine and temperatures around 25°C drive ozone formation, with levels peaking in the afternoon. 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 East Pasadena right now?
On 6 October 2026, overall air quality in East Pasadena is very poor. AQI is the main air quality indicator at 82.9/100. Pollution peaks around 3:00 PM (PM10: 82.9/100).
Will air quality be worse tomorrow in East Pasadena?
On 7 October 2026, air quality conditions in East Pasadena will be better than today, with AQI forecast at moderate at 47.4/100. Pollution peaks around 8:00 AM (PM10: 47.4/100).
When is air pollution at its worst in East Pasadena?
Air near roads is often at its worst from January to March, when nights cool to around 12°C and the air turns still. From June to September, strong sunshine and temperatures around 25°C drive ozone formation, with levels peaking in the afternoon. The risk of wildfire smoke peaks from April to October, when dry vegetation burns easily.
Are air quality levels in East Pasadena 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. |