San Tan Valley Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in San Tan Valley is fair. AQI, PM2.5, and PM10 are fair; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 32.7/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in San Tan Valley is fair. All pollutants stay as today. Pollution peaks around 6:00 AM (PM10: 32.1/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 32.7/100 |
| PM2.5 (fine particles) | Fair | 20.1/100 |
| PM10 (coarse particles) | Fair | 32.7/100 |
| NO2 (nitrogen dioxide) | Good | 2.6/100 |
| O3 (ozone) | Good | 19.8/100 |
| SO2 (sulfur dioxide) | Good | 0.5/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 1.3/100 |
| PM1 (ultrafine particles) | Good | 1.1/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 32.1/100 |
| PM2.5 (fine particles) | Fair | 24.4/100 |
| PM10 (coarse particles) | Fair | 32.1/100 |
| NO2 (nitrogen dioxide) | Good | 3.2/100 |
| O3 (ozone) | Good | 17.2/100 |
| SO2 (sulfur dioxide) | Good | 0.6/100 |
| CO (carbon monoxide) | Good | 0.4/100 |
| HCHO (formaldehyde) | Good | 1.2/100 |
| PM1 (ultrafine particles) | Good | 2.0/100 |
Local Environmental Conditions
Around the center of San Tan Valley, traffic is light and there are few concentrated sources of air pollution. Local sources include traffic on US-60 and SR-24. Surrounding farmland adds dust from plowing and harvesting, ammonia from fertilizer and livestock, and smoke when crop residues are burned. On some days, pollution drifting in from farther away outweighs local sources.
Cooler, still evenings from December to February, averaging about 11°C, tend to hold exhaust close to busy streets. In the warmer months, summer sun from April to October cooks traffic fumes into ozone, especially in the warmest month, which averages 35°C. Dry weather from April to June lets wind lift dust from open ground, raising coarse particle levels and sometimes leaving a dusty haze.
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Frequently Asked Questions About Air Quality in Arizona
Is air quality bad in San Tan Valley right now?
On 10 October 2026, overall air quality in San Tan Valley is fair. AQI is the main air quality indicator at 32.7/100. Pollution peaks around 10:00 AM (PM10: 32.7/100).
Will air quality be worse tomorrow in San Tan Valley?
On 11 October 2026, air quality conditions in San Tan Valley will be similar to today, with AQI forecast at fair at 32.1/100. Pollution peaks around 6:00 AM (PM10: 32.1/100).
When is air pollution at its worst in San Tan Valley?
Cooler, still evenings from December to February, averaging about 11°C, tend to hold exhaust close to busy streets. In the warmer months, summer sun from April to October cooks traffic fumes into ozone, especially in the warmest month, which averages 35°C. Dry weather from April to June lets wind lift dust from open ground, raising coarse particle levels and sometimes leaving a dusty haze.
Are air quality levels in San Tan Valley 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. |