Worst air pollution Tracy, today and tomorrow
Today (9 August): Air quality in Tracy is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 AM (O3: 30.1/100).
Tomorrow (10 August 2026): Air quality in Tracy is fair. PM2.5 decreases to good; all other pollutants stay as today. Pollution peaks around 11:00 PM (O3: 34.8/100). 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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Tracy's air quality reflects the San Joaquin Valley's position at the Delta corridor gateway, with vehicle emissions from I-205 and SR-580 the primary local source. The Bay Delta breeze from San Francisco Bay provides afternoon ventilation on most days offering relief from the valley inversion, while summer ozone from the valley's agricultural and vehicle emissions corridor is the primary warm-season concern.
Today - 9 August | Pollution peaks at 06:00
AQI:
Fair
30.1/100
PM2.5 (fine particles):
Fair
22.4/100
PM10 (coarse particles):
Good
8.8/100
NO2 (nitrogen dioxide):
Good
14.2/100
O3 (ozone):
Fair
30.1/100
SO2 (sulfur dioxide):
Good
8.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
14.8/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Fair
34.8/100
PM2.5 (fine particles):
Good
19.8/100
PM10 (coarse particles):
Good
9.2/100
NO2 (nitrogen dioxide):
Good
8.5/100
O3 (ozone):
Fair
34.8/100
SO2 (sulfur dioxide):
Good
8.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
13.2/100
Pollen forecast in Tracy
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Tracy
Frequently Asked Questions
Is air quality bad in Tracy right now?
On 9 August 2026, overall air quality in Tracy is fair. AQI is the main air quality indicator at 30.1/100. Pollution peaks around 6:00 AM (O3: 30.1/100).
Will air quality be worse tomorrow in Tracy?
On 10 August 2026, air quality conditions in Tracy will be similar to today, with AQI forecast at fair at 34.8/100. Pollution peaks around 11:00 PM (O3: 34.8/100).
When is air pollution at its worst in Tracy?
Like most US cities, Tracy sees air quality shift from season to season. In short, winter typically brings the cleanest stretch, once occasional rain clears the basin, whereas summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Tracy 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: 10 August 2026 at 02:34 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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