Worst air pollution The Alameda - San Jose, today and tomorrow
Today (15 July): Air quality in The Alameda is fair. PM2.5 and NO2 are fair; AQI and O3 are medium; PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 45.8/100).
Tomorrow (16 July 2026): Air quality in The Alameda is fair. All pollutants stay as today. Pollution peaks around 9:00 AM (O3: 44.7/100). 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
Use our Strava plugin to check your own exposure.
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 - 15 July | Pollution peaks at 09:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Fair
20.6/100
PM10 (coarse particles):
Good
13.0/100
NO2 (nitrogen dioxide):
Fair
22.4/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
7.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
12.6/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Medium
44.7/100
PM2.5 (fine particles):
Fair
26.1/100
PM10 (coarse particles):
Good
13.4/100
NO2 (nitrogen dioxide):
Fair
33.5/100
O3 (ozone):
Medium
44.7/100
SO2 (sulfur dioxide):
Good
7.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
17.1/100
Other Landmarks in San Jose
Sports venues in San Jose
Frequently Asked Questions
Is air quality bad in The Alameda right now?
On 15 July 2026, overall air quality in The Alameda is fair. NO2 is the main pollutant at 22.4/100. Pollution peaks around 9:00 AM (O3: 45.8/100).
Will air quality be worse tomorrow in The Alameda?
On 16 July 2026, air quality conditions in The Alameda will be similar to today, with NO2 forecast at fair at 33.5/100. Pollution peaks around 9:00 AM (O3: 44.7/100).
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.
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: 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