Worst air pollution California's Great America - San Jose, today and tomorrow
Today (15 July): Air quality in California's Great America 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 California's Great America is fair. PM2.5 increases to fair; all other 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 California's Great America air quality reflects the Santa Clara Valley's partial topographic enclosure in Silicon Valley, with concentrated visitor vehicle traffic on US-101 and the surrounding technology campus corridor contributing elevated NOₓ during peak summer periods. Bay Delta breezes provide afternoon ventilation, while the park's suburban character and the Silicon Valley's moderate background generally maintain reasonable conditions during non-peak periods throughout most of the year.
Today - 15 July | Pollution peaks at 09:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Good
15.8/100
PM10 (coarse particles):
Good
9.9/100
NO2 (nitrogen dioxide):
Good
10.5/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
9.6/100
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
20.5/100
PM10 (coarse particles):
Good
10.3/100
NO2 (nitrogen dioxide):
Good
17.3/100
O3 (ozone):
Medium
44.7/100
SO2 (sulfur dioxide):
Good
3.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
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 California's Great America right now?
On 15 July 2026, overall air quality in California's Great America 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 California's Great America?
On 16 July 2026, air quality conditions in California's Great America will be worse than today, with PM2.5 forecast at fair at 20.5/100. Pollution peaks around 9:00 AM (O3: 44.7/100).
When is air pollution at its worst in California's Great America?
California's Great America's air quality follows a clear seasonal pattern. Typically, late winter and spring tend to have the cleanest conditions, once winter rains settle in, while the long dry stretch from midsummer into autumn brings both ozone and wildfire smoke risk. Dry summer conditions with virtually no rain mean pollution and smoke can linger for extended stretches once they arrive.
Are air quality levels in California's Great America 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