Worst air pollution Cupertino, today and tomorrow
Today (15 July): Air quality in Cupertino 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 Cupertino is fair. PM2.5 increases to fair; NO2 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
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Cupertino's air quality benefits from the Santa Clara Valley's partial topographic enclosure in Silicon Valley, with vehicle emissions from I-280 and the Apple campus and surrounding technology operations contributing local sources. Bay Delta breezes provide afternoon ventilation, while the Santa Cruz Mountains create topographic variation and summer wildfire smoke from the surrounding Bay Area hills is an increasingly frequent and severe seasonal concern throughout the year.
Today - 15 July | Pollution peaks at 09:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Good
16.6/100
PM10 (coarse particles):
Good
10.4/100
NO2 (nitrogen dioxide):
Good
12.7/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
10.1/100
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
21.4/100
PM10 (coarse particles):
Good
10.8/100
NO2 (nitrogen dioxide):
Fair
20.7/100
O3 (ozone):
Medium
44.7/100
SO2 (sulfur dioxide):
Good
3.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
13.8/100
Pollen forecast in Cupertino
View pollen forecastFrequently Asked Questions
Is air quality bad in Cupertino right now?
On 15 July 2026, overall air quality in Cupertino 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 Cupertino?
On 16 July 2026, air quality conditions in Cupertino will be worse than today, with PM2.5 forecast at fair at 21.4/100. Pollution peaks around 9:00 AM (O3: 44.7/100).
When is air pollution at its worst in Cupertino?
Cupertino experiences a distinct seasonal swing in air quality. In short, the shortest stretch of clean air usually falls in the wetter winter months, whereas summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in Cupertino 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