Worst air pollution Vacaville, today and tomorrow
Today (15 July): Air quality in Vacaville is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 33.8/100).
Tomorrow (16 July 2026): Air quality in Vacaville is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 PM (NO2: 39.3/100). 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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Vacaville's air quality reflects the Solano County position in the San Francisco Bay Delta corridor, with vehicle emissions from I-80 the primary local source. The Bay Delta breeze from Carquinez Strait provides afternoon ventilation on most days, offering some relief from the Sacramento Valley inversion, while summer wildfire smoke from the surrounding North Bay and Sacramento Valley foothills is an increasingly frequent and severe seasonal concern.
Today - 15 July | Pollution peaks at 10:00
AQI:
Fair
33.8/100
PM2.5 (fine particles):
Good
14.6/100
PM10 (coarse particles):
Good
9.9/100
NO2 (nitrogen dioxide):
Fair
25.5/100
O3 (ozone):
Fair
33.8/100
SO2 (sulfur dioxide):
Good
4.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
8.7/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 22:00
AQI:
Fair
39.3/100
PM2.5 (fine particles):
Fair
22.8/100
PM10 (coarse particles):
Good
12.6/100
NO2 (nitrogen dioxide):
Fair
39.3/100
O3 (ozone):
Fair
32.8/100
SO2 (sulfur dioxide):
Good
6.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.7/100
PM1 (ultrafine particles):
Good
15.9/100
Pollen forecast in Vacaville
View pollen forecastFrequently Asked Questions
Is air quality bad in Vacaville right now?
On 15 July 2026, overall air quality in Vacaville is fair. AQI is the main air quality indicator at 33.8/100. Pollution peaks around 10:00 AM (O3: 33.8/100).
Will air quality be worse tomorrow in Vacaville?
On 16 July 2026, air quality conditions in Vacaville will be similar to today, with AQI forecast at fair at 39.3/100. Pollution peaks around 10:00 PM (NO2: 39.3/100).
When is air pollution at its worst in Vacaville?
Vacaville's air quality follows a clear seasonal pattern. In short, winter rains provide the only real relief from an otherwise persistent haze, whereas from August into October, wildfire smoke can add sharp particulate spikes on top of the usual summer ozone. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in Vacaville 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