Worst air pollution Sunnyvale, today and tomorrow
Today (9 August): Air quality in Sunnyvale is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 28.1/100).
Tomorrow (10 August 2026): Air quality in Sunnyvale is fair. All pollutants stay as today. Pollution peaks around 7:00 AM (O3: 35.5/100). 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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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 - 9 August | Pollution peaks at 09:00
AQI:
Fair
28.1/100
PM2.5 (fine particles):
Good
13.6/100
PM10 (coarse particles):
Good
5.1/100
NO2 (nitrogen dioxide):
Good
3.8/100
O3 (ozone):
Fair
28.1/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
9.2/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 07:00
AQI:
Fair
35.5/100
PM2.5 (fine particles):
Good
15.2/100
PM10 (coarse particles):
Good
6.1/100
NO2 (nitrogen dioxide):
Good
3.8/100
O3 (ozone):
Fair
35.5/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.1/100
PM1 (ultrafine particles):
Good
10.1/100
Pollen forecast in Sunnyvale
View pollen forecastFrequently Asked Questions
Is air quality bad in Sunnyvale right now?
On 9 August 2026, overall air quality in Sunnyvale is fair. AQI is the main air quality indicator at 28.1/100. Pollution peaks around 9:00 AM (O3: 28.1/100).
Will air quality be worse tomorrow in Sunnyvale?
On 10 August 2026, air quality conditions in Sunnyvale will be similar to today, with AQI forecast at fair at 35.5/100. Pollution peaks around 7:00 AM (O3: 35.5/100).
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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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