Worst air pollution The Alameda - San Jose, today and tomorrow
Today (9 August): Air quality in The Alameda is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 28.1/100).
Tomorrow (10 August 2026): Air quality in The Alameda is fair. All pollutants stay as today. Pollution peaks around 7:00 AM (O3: 35.5/100). 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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San Jose's Alameda air quality reflects the historic mixed-use boulevard corridor, with vehicle traffic on The Alameda and the surrounding mixed residential and commercial character contributing local sources. The Bay Delta breeze provides afternoon ventilation, while the neighbourhood's walkable boulevard character and the tree-lined streetscape provide natural filtration and The Alameda generally maintains moderate San Jose metropolitan readings throughout most of the year.
Today - 9 August | Pollution peaks at 09:00
AQI:
Fair
28.1/100
PM2.5 (fine particles):
Good
17.6/100
PM10 (coarse particles):
Good
6.6/100
NO2 (nitrogen dioxide):
Good
8.1/100
O3 (ozone):
Fair
28.1/100
SO2 (sulfur dioxide):
Good
5.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
11.9/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 07:00
AQI:
Fair
35.5/100
PM2.5 (fine particles):
Good
19.6/100
PM10 (coarse particles):
Good
7.8/100
NO2 (nitrogen dioxide):
Good
8.0/100
O3 (ozone):
Fair
35.5/100
SO2 (sulfur dioxide):
Good
5.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
13.1/100
Other Landmarks in San Jose
Sports venues in San Jose
Frequently Asked Questions
Is air quality bad in The Alameda right now?
On 9 August 2026, overall air quality in The Alameda is fair. AQI is the main air quality indicator at 28.1/100. Pollution peaks around 9:00 AM (O3: 28.1/100).
Will air quality be worse tomorrow in The Alameda?
On 10 August 2026, air quality conditions in The Alameda will be similar to today, with AQI forecast at fair at 35.5/100. Pollution peaks around 7:00 AM (O3: 35.5/100).
When is air pollution at its worst in The Alameda?
The Alameda's air quality follows a clear seasonal pattern. In short, late winter and spring tend to have the cleanest conditions, once winter rains settle in, whereas summer and early autumn bring the highest risk, with heat-driven ozone and wildfire smoke both peaking from July through October. Dry summer conditions with virtually no rain mean pollution and smoke can linger for extended stretches once they arrive.
Are air quality levels in The Alameda 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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