San Miguel Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (6 October): Air quality in San Miguel is poor. AQI and NO2 are poor; PM2.5 and PM10 are moderate; O3 and PM1 are fair; SO2, CO, and HCHO are good. Pollution peaks around 1:00 PM (NO2: 78.5/100).
Air Quality Tomorrow
Tomorrow (7 October 2026): Air quality in San Miguel is very poor. AQI worsens to very poor; NO2 increases to very poor; all other pollutants stay as today. Pollution peaks around 3:00 PM (NO2: 80.6/100).
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Air Quality
Today - 6 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Poor | 78.5/100 |
| PM2.5 (fine particles) | Moderate | 48.6/100 |
| PM10 (coarse particles) | Moderate | 45.3/100 |
| NO2 (nitrogen dioxide) | Poor | 78.5/100 |
| O3 (ozone) | Fair | 23.0/100 |
| SO2 (sulfur dioxide) | Good | 7.0/100 |
| CO (carbon monoxide) | Good | 0.7/100 |
| HCHO (formaldehyde) | Good | 5.1/100 |
| PM1 (ultrafine particles) | Fair | 25.4/100 |
Tomorrow - 7 October
| Pollen species | Level | Value |
|---|---|---|
| AQI | Very poor | 80.6/100 |
| PM2.5 (fine particles) | Moderate | 45.8/100 |
| PM10 (coarse particles) | Moderate | 46.9/100 |
| NO2 (nitrogen dioxide) | Very poor | 80.6/100 |
| O3 (ozone) | Fair | 22.6/100 |
| SO2 (sulfur dioxide) | Good | 4.9/100 |
| CO (carbon monoxide) | Good | 0.7/100 |
| HCHO (formaldehyde) | Good | 4.1/100 |
| PM1 (ultrafine particles) | Fair | 23.6/100 |
Local Environmental Conditions
Around the center of San Miguel, a mix of built-up land and open space means traffic is an important, but not overwhelming, local pollution source. Open grassland and scrub can produce smoke during grass fires and some dust in dry spells. On some days, pollution drifting in from farther away outweighs local sources.
Fine particle levels climb from December to February, as home heating and traffic combine with cold, still air averaging 10°C. Hot afternoons from June to September, averaging 22°C in the warmest month, are when ozone is most likely to build up. Wildfire season runs roughly from May to October, when smoke from fires, near or far, can bring hazy days and very poor air quality.
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Frequently Asked Questions About Air Quality in California
Is air quality bad in San Miguel right now?
On 6 October 2026, overall air quality in San Miguel is poor. AQI is the main air quality indicator at 78.5/100. Pollution peaks around 1:00 PM (NO2: 78.5/100).
Will air quality be worse tomorrow in San Miguel?
On 7 October 2026, air quality conditions in San Miguel will be worse than today, with AQI forecast at very poor at 80.6/100. Pollution peaks around 3:00 PM (NO2: 80.6/100).
When is air pollution at its worst in San Miguel?
Fine particle levels climb from December to February, as home heating and traffic combine with cold, still air averaging 10°C. Hot afternoons from June to September, averaging 22°C in the warmest month, are when ozone is most likely to build up. Wildfire season runs roughly from May to October, when smoke from fires, near or far, can bring hazy days and very poor air quality.
Are air quality levels in San Miguel 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. |