Worst air pollution Redwood City, today and tomorrow
Today (15 July): Air quality in Redwood City is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 39.4/100).
Tomorrow (16 July 2026): Air quality in Redwood City is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 41.0/100). 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.
Redwood City's air quality benefits from the San Francisco Peninsula position on San Francisco Bay, with consistent Bay Delta breezes and marine layer conditions providing reliable maritime ventilation. Vehicle emissions from US-101 and the Caltrain corridor are the primary local sources, while the bay's open geometry provides good ventilation and summer wildfire smoke from surrounding Bay Area hills and Santa Cruz Mountains is an increasingly frequent seasonal concern.
Today - 15 July | Pollution peaks at 08:00
AQI:
Fair
39.4/100
PM2.5 (fine particles):
Good
11.6/100
PM10 (coarse particles):
Good
7.1/100
NO2 (nitrogen dioxide):
Good
0.6/100
O3 (ozone):
Fair
39.4/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
6.4/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 10:00
AQI:
Medium
41.0/100
PM2.5 (fine particles):
Good
16.2/100
PM10 (coarse particles):
Good
7.9/100
NO2 (nitrogen dioxide):
Good
1.2/100
O3 (ozone):
Medium
41.0/100
SO2 (sulfur dioxide):
Good
0.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
10.7/100
Pollen forecast in Redwood City
View pollen forecastFrequently Asked Questions
Is air quality bad in Redwood City right now?
On 15 July 2026, overall air quality in Redwood City is fair. AQI is the main air quality indicator at 39.4/100. Pollution peaks around 8:00 AM (O3: 39.4/100).
Will air quality be worse tomorrow in Redwood City?
On 16 July 2026, air quality conditions in Redwood City will be better than today, with AQI forecast at medium at 41.0/100. Pollution peaks around 10:00 AM (O3: 41.0/100).
When is air pollution at its worst in Redwood City?
Like most US cities, Redwood City sees air quality shift from season to season, as the shortest stretch of clean air usually falls in the wetter winter months; by contrast, hot, sunny summer conditions drive persistent ozone problems, compounded by wildfire smoke risk into early autumn. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Redwood City 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