Worst air pollution Sunnyvale, today and tomorrow
Today (15 July): Air quality in Sunnyvale 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 Sunnyvale 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
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Sunnyvale's air quality reflects the Santa Clara Valley's partial topographic enclosure in the San Francisco Bay Area, with vehicle emissions from US-101 and the concentrated Silicon Valley semiconductor and technology manufacturing generating VOC and industrial emissions alongside the primary traffic sources. The Bay Delta breeze provides afternoon ventilation on most days, while the Diablo Range and Santa Cruz Mountains create valley topography, and summer wildfire smoke from the surrounding Bay Area hills and Santa Cruz Mountains is an increasingly frequent seasonal concern.
Today - 15 July | Pollution peaks at 09:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Good
16.0/100
PM10 (coarse particles):
Good
10.0/100
NO2 (nitrogen dioxide):
Good
11.1/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
9.7/100
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
20.7/100
PM10 (coarse particles):
Good
10.4/100
NO2 (nitrogen dioxide):
Good
18.2/100
O3 (ozone):
Medium
44.7/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
13.3/100
Pollen forecast in Sunnyvale
View pollen forecastFrequently Asked Questions
Is air quality bad in Sunnyvale right now?
On 15 July 2026, overall air quality in Sunnyvale 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 Sunnyvale?
On 16 July 2026, air quality conditions in Sunnyvale will be worse than today, with PM2.5 forecast at fair at 20.7/100. Pollution peaks around 9:00 AM (O3: 44.7/100).
When is air pollution at its worst in Sunnyvale?
Sunnyvale follows a fairly predictable seasonal air quality pattern — winter typically brings the cleanest stretch, once occasional rain clears the basin, whereas summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Sunnyvale 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