Worst air pollution Alum Rock Park - San Jose, today and tomorrow
Today (15 July): Air quality in Alum Rock Park 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 Alum Rock Park 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.
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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 Alum Rock Park air quality benefits from the 720-acre East Foothills park's substantial woodland providing natural filtration at the Diablo Range base. Vehicle traffic on Alum Rock Avenue contributes modest local sources, while the elevated foothills position provides marginally better dispersal than the flat valley floor and the park's natural setting generally maintains good conditions throughout most of the year.
Today - 15 July | Pollution peaks at 09:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Good
11.8/100
PM10 (coarse particles):
Good
7.4/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
7.2/100
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
15.3/100
PM10 (coarse particles):
Good
7.6/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
44.7/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
9.8/100
Other Landmarks in San Jose
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Frequently Asked Questions
Is air quality bad in Alum Rock Park right now?
On 15 July 2026, overall air quality in Alum Rock Park 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 Alum Rock Park?
On 16 July 2026, air quality conditions in Alum Rock Park 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 Alum Rock Park?
Seasonal changes shape air quality at Alum Rock Park much as they do across San Jose. In short, spring typically offers the best combination of mild weather and clear air, whereas the long dry stretch from midsummer into autumn brings both ozone and wildfire smoke risk. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Alum Rock Park 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.
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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