Worst air pollution Upland, today and tomorrow
Today (9 August): Air quality in Upland is fair. AQI, PM2.5, PM10, and O3 are fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (PM10: 31.1/100).
Tomorrow (10 August 2026): Air quality in Upland is fair. PM2.5 decreases to good; PM10 decreases to good; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 23.8/100). 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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Upland's air quality reflects the San Gabriel Valley's enclosed position in the Los Angeles basin, with vehicle emissions from I-10 and the surrounding residential and commercial character generating elevated NOₓ under persistent temperature inversions. The San Gabriel Mountains to the north create significant topographic enclosure, while the basin inversion traps emissions throughout much of the year and Upland's position at the valley's eastern edge experiences some of the Inland Empire transition zone's more challenging air quality conditions.
Today - 9 August | Pollution peaks at 18:00
AQI:
Fair
31.1/100
PM2.5 (fine particles):
Fair
22.6/100
PM10 (coarse particles):
Fair
31.1/100
NO2 (nitrogen dioxide):
Good
1.1/100
O3 (ozone):
Fair
24.1/100
SO2 (sulfur dioxide):
Good
1.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.4/100
PM1 (ultrafine particles):
Good
6.3/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 10:00
AQI:
Fair
23.8/100
PM2.5 (fine particles):
Good
14.6/100
PM10 (coarse particles):
Good
15.6/100
NO2 (nitrogen dioxide):
Good
2.3/100
O3 (ozone):
Fair
23.8/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.4/100
PM1 (ultrafine particles):
Good
6.5/100
Pollen forecast in Upland
View pollen forecastFrequently Asked Questions
Is air quality bad in Upland right now?
On 9 August 2026, overall air quality in Upland is fair. AQI is the main air quality indicator at 31.1/100. Pollution peaks around 6:00 PM (PM10: 31.1/100).
Will air quality be worse tomorrow in Upland?
On 10 August 2026, air quality conditions in Upland will be similar to today, with AQI forecast at fair at 23.8/100. Pollution peaks around 10:00 AM (O3: 23.8/100).
When is air pollution at its worst in Upland?
Upland's air quality follows a clear seasonal pattern. Typically, the cleanest air usually comes in winter, when storms periodically flush pollution out of the basin, while summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in Upland 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: 9 August 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.
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