Worst air pollution Willow Glen - San Jose, today and tomorrow
Today (15 July): Air quality in Willow Glen is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 45.8/100).
Tomorrow (16 July 2026): Air quality in Willow Glen is medium. 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 Willow Glen air quality reflects the historic inner-city residential neighbourhood, with vehicle traffic on Lincoln Avenue and the surrounding tree-lined residential and commercial character contributing local sources. The neighbourhood's mature tree canopy provides natural filtration, while the Bay Delta breeze provides afternoon ventilation and Willow Glen generally maintains among San Jose's more pleasant inner residential environments throughout most of the year.
Today - 15 July | Pollution peaks at 09:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Good
15.3/100
PM10 (coarse particles):
Good
9.6/100
NO2 (nitrogen dioxide):
Good
9.2/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
9.3/100
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):
Good
19.9/100
PM10 (coarse particles):
Good
9.9/100
NO2 (nitrogen dioxide):
Good
15.1/100
O3 (ozone):
Medium
44.7/100
SO2 (sulfur dioxide):
Good
2.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
12.7/100
Other Landmarks in San Jose
Sports venues in San Jose
Frequently Asked Questions
Is air quality bad in Willow Glen right now?
On 15 July 2026, overall air quality in Willow Glen is medium. AQI is the main air quality indicator at 45.8/100. Pollution peaks around 9:00 AM (O3: 45.8/100).
Will air quality be worse tomorrow in Willow Glen?
On 16 July 2026, air quality conditions in Willow Glen will be similar to today, with AQI forecast at medium at 44.7/100. Pollution peaks around 9:00 AM (O3: 44.7/100).
When is air pollution at its worst in Willow Glen?
Conditions at Willow Glen vary noticeably across the seasons, as late winter and spring tend to have the cleanest conditions, once winter rains settle in; by contrast, summer and early autumn bring the highest risk, with heat-driven ozone and wildfire smoke both peaking from July through October. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Willow Glen 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