Worst air pollution Tracy, today and tomorrow
Today (15 July): Air quality in Tracy is fair. AQI, PM2.5, NO2, and O3 are fair; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 39.4/100).
Tomorrow (16 July 2026): Air quality in Tracy is fair. AQI improves to medium; NO2 decreases to medium; O3 decreases to medium; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 2:00 AM (NO2: 43.6/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
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 - 15 July | Pollution peaks at 08:00
AQI:
Fair
39.4/100
PM2.5 (fine particles):
Fair
24.7/100
PM10 (coarse particles):
Good
15.6/100
NO2 (nitrogen dioxide):
Fair
25.5/100
O3 (ozone):
Fair
39.4/100
SO2 (sulfur dioxide):
Good
11.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
13.9/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 02:00
AQI:
Medium
43.6/100
PM2.5 (fine particles):
Fair
33.5/100
PM10 (coarse particles):
Good
17.2/100
NO2 (nitrogen dioxide):
Medium
43.6/100
O3 (ozone):
Medium
41.0/100
SO2 (sulfur dioxide):
Good
11.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Fair
22.3/100
Pollen forecast in Tracy
View pollen forecastFrequently Asked Questions
Is air quality bad in Tracy right now?
On 15 July 2026, overall air quality in Tracy is fair. AQI is the main air quality indicator at 39.4/100. Pollution peaks around 8:00 AM (O3: 39.4/100).
Will air quality be worse tomorrow in Tracy?
On 16 July 2026, air quality conditions in Tracy will be similar to today, with PM2.5 forecast at fair at 33.5/100. Pollution peaks around 2:00 AM (NO2: 43.6/100).
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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app