Worst air pollution Pleasanton, today and tomorrow
Today (20 September): Air quality in Pleasanton is fair. AQI, PM2.5, PM10, and O3 are fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 36.8/100).
Tomorrow (21 September 2026): Air quality in Pleasanton is fair. All pollutants stay as today. Pollution peaks around 1:00 AM (O3: 37.4/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Pleasanton's air quality reflects the Amador Valley's partial topographic enclosure in the Tri-Valley area of the East Bay, with vehicle emissions from I-580 the primary local source. The Altamont Pass Delta breeze provides afternoon ventilation on most summer days, while summer wildfire smoke from surrounding East Bay hills and the Mount Diablo range is an increasingly frequent seasonal concern and the valley's topographic variation creates periodic morning inversion episodes.
Today - 20 September | Pollution peaks at 23:00
AQI:
Fair
36.8/100
PM2.5 (fine particles):
Fair
26.9/100
PM10 (coarse particles):
Fair
20.3/100
NO2 (nitrogen dioxide):
Good
2.1/100
O3 (ozone):
Fair
36.8/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.3/100
PM1 (ultrafine particles):
Good
17.4/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 01:00
AQI:
Fair
37.4/100
PM2.5 (fine particles):
Fair
28.5/100
PM10 (coarse particles):
Fair
21.0/100
NO2 (nitrogen dioxide):
Good
0.9/100
O3 (ozone):
Fair
37.4/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.2/100
PM1 (ultrafine particles):
Good
16.4/100
Pollen forecast in Pleasanton
View pollen forecastAir quality forecasts for neighbourhoods and landmarks in Pleasanton
Frequently Asked Questions
Is air quality bad in Pleasanton right now?
On 20 September 2026, overall air quality in Pleasanton is fair. AQI is the main air quality indicator at 36.8/100. Pollution peaks around 11:00 PM (O3: 36.8/100).
Will air quality be worse tomorrow in Pleasanton?
On 21 September 2026, air quality conditions in Pleasanton will be similar to today, with AQI forecast at fair at 37.4/100. Pollution peaks around 1:00 AM (O3: 37.4/100).
When is air pollution at its worst in Pleasanton?
Air quality across Pleasanton rises and falls with the seasons — the shortest stretch of clean air usually falls in the wetter winter months, 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 Pleasanton 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.
Want to see air quality forecasts for other cities in United States?
Check air quality in other popular cities:
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.
Get the full experience in the Airmine app.