Worst air pollution Davis, today and tomorrow
Today (20 September): Air quality in Davis is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (PM2.5: 25.9/100).
Tomorrow (21 September 2026): Air quality in Davis is fair. PM10 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (PM2.5: 32.5/100). Airmine updates local air quality forecasts four times daily.
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Davis' air quality reflects the Sacramento Valley's temperature inversion problem, with vehicle emissions from I-80 and the UC Davis campus and surrounding agricultural research operations contributing local sources. Winter tule fog inversions trap vehicle emissions, while summer ozone from the Sacramento Valley agricultural corridor is the primary warm-season concern and the surrounding Yolo County rice and tomato farming adds agricultural PM2.5 during the autumn harvest season.
Today - 20 September | Pollution peaks at 09:00
AQI:
Fair
25.9/100
PM2.5 (fine particles):
Fair
25.9/100
PM10 (coarse particles):
Good
17.8/100
NO2 (nitrogen dioxide):
Good
7.0/100
O3 (ozone):
Fair
22.6/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
4.9/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 10:00
AQI:
Fair
32.5/100
PM2.5 (fine particles):
Fair
32.5/100
PM10 (coarse particles):
Fair
22.0/100
NO2 (nitrogen dioxide):
Good
12.9/100
O3 (ozone):
Fair
25.9/100
SO2 (sulfur dioxide):
Good
1.1/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
6.8/100
Pollen forecast in Davis
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Davis
Frequently Asked Questions
Is air quality bad in Davis right now?
On 20 September 2026, overall air quality in Davis is fair. AQI is the main air quality indicator at 25.9/100. Pollution peaks around 9:00 AM (PM2.5: 25.9/100).
Will air quality be worse tomorrow in Davis?
On 21 September 2026, air quality conditions in Davis will be similar to today, with AQI forecast at fair at 32.5/100. Pollution peaks around 10:00 AM (PM2.5: 32.5/100).
When is air pollution at its worst in Davis?
Conditions in Davis vary noticeably across the seasons — late winter and spring tend to have the cleanest conditions, once winter rains settle in, whereas wildfire smoke season from July through October is the dominant concern, sometimes overwhelming other pollution sources for days at a time. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Davis 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 14:33 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.
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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