San Pasqual, East Pasadena Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in San Pasqual 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 San Pasqual 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 | 47.3/100 |
| PM10 (coarse particles) | Very poor | 82.9/100 |
| NO2 (nitrogen dioxide) | Good | 6.4/100 |
| O3 (ozone) | Fair | 22.0/100 |
| 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 | 34.6/100 |
| PM10 (coarse particles) | Moderate | 47.4/100 |
| NO2 (nitrogen dioxide) | Good | 14.1/100 |
| O3 (ozone) | Fair | 22.4/100 |
| 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
Around this part of East Pasadena, dense development means road traffic is the main local source of nitrogen dioxide and fine particles. Trees nearby help filter some particles from the air, though in hot weather they also emit compounds that feed ozone formation. On some days, pollution drifting in from farther away outweighs local sources.
Warm, sunny weather from June to September, around 25°C at its peak, raises afternoon ozone levels. From January to March, cooler nights and lighter winds, with temperatures around 12°C, let traffic pollution linger near busy roads. From April to October, hot, dry weather raises the risk of wildfires, and their smoke can cover the area in haze.
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Frequently Asked Questions About Air Quality in California
Is air quality bad in San Pasqual right now?
On 6 October 2026, overall air quality in San Pasqual 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 San Pasqual?
On 7 October 2026, air quality conditions in San Pasqual 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 San Pasqual?
Warm, sunny weather from June to September, around 25°C at its peak, raises afternoon ozone levels. From January to March, cooler nights and lighter winds, with temperatures around 12°C, let traffic pollution linger near busy roads. From April to October, hot, dry weather raises the risk of wildfires, and their smoke can cover the area in haze.
Are air quality levels in San Pasqual 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. |