Worst air pollution San Tan Valley, today and tomorrow
Today (20 September): Air quality in San Tan Valley is moderate. AQI, PM2.5, and PM10 are moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (PM10: 54.3/100).
Tomorrow (21 September 2026): Air quality in San Tan Valley is moderate. O3 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 AM (PM10: 45.7/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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San Tan Valley's air quality reflects the Phoenix metropolitan area's southeastern basin extension, with vehicle emissions from US-60 and SR-24 the primary local source in this rapidly growing Pinal County suburban development. Windblown Sonoran Desert dust from surrounding open desert areas contributes PM10 during haboob events, while summer ozone from the vast Phoenix metropolitan traffic and intense desert heat are the primary warm-season concerns.
Today - 20 September | Pollution peaks at 10:00
AQI:
Moderate
54.3/100
PM2.5 (fine particles):
Moderate
42.1/100
PM10 (coarse particles):
Moderate
54.3/100
NO2 (nitrogen dioxide):
Good
4.0/100
O3 (ozone):
Good
19.3/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.4/100
HCHO (formaldehyde):
Good
0.9/100
PM1 (ultrafine particles):
Good
1.9/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 00:00
AQI:
Moderate
45.7/100
PM2.5 (fine particles):
Moderate
40.0/100
PM10 (coarse particles):
Moderate
45.7/100
NO2 (nitrogen dioxide):
Good
3.3/100
O3 (ozone):
Fair
20.9/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.6/100
PM1 (ultrafine particles):
Good
2.5/100
Pollen forecast in San Tan Valley
View pollen forecastFrequently Asked Questions
Is air quality bad in San Tan Valley right now?
On 20 September 2026, overall air quality in San Tan Valley is moderate. AQI is the main air quality indicator at 54.3/100. Pollution peaks around 10:00 AM (PM10: 54.3/100).
Will air quality be worse tomorrow in San Tan Valley?
On 21 September 2026, air quality conditions in San Tan Valley will be similar to today, with AQI forecast at moderate at 45.7/100. Pollution peaks around 12:00 AM (PM10: 45.7/100).
When is air pollution at its worst in San Tan Valley?
Seasonal changes shape air quality across San Tan Valley. Typically, the cooler winter months typically bring the cleanest air of the year, while intense summer heat combines with occasional dust events to create the year's worst episodes. Monsoon storms in July and August can either clear the air with rain or stir up dust ahead of the storm front.
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.
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Data provided by Airmine — Last update: 20 September 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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