Worst air pollution Bay Bridge - San Francisco, today and tomorrow
Today (15 July): Air quality in Bay Bridge 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 Bay Bridge 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
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San Francisco Bay Bridge's air quality reflects the San Francisco Bay crossing, with vehicle traffic on the I-80 bridge deck and the surrounding extraordinary Bay Area urban density generating elevated NOₓ from the bridge's concentrated traffic. The Bay's consistent tidal breezes and the Golden Gate's channelled Pacific winds provide reliable ventilation, while the bridge's open water position provides significantly better dispersal than the enclosed urban street canyons and generally maintains moderate Bay Area metropolitan readings throughout most of the year.
Today - 15 July | Pollution peaks at 08:00
AQI:
Fair
39.4/100
PM2.5 (fine particles):
Good
11.4/100
PM10 (coarse particles):
Good
7.0/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
39.4/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
6.2/100
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
15.8/100
PM10 (coarse particles):
Good
7.7/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
41.0/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
1.9/100
PM1 (ultrafine particles):
Good
10.4/100
Other Landmarks in San Francisco
Sports venues in San Francisco
Frequently Asked Questions
Is air quality bad in Bay Bridge right now?
On 15 July 2026, overall air quality in Bay Bridge 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 Bay Bridge?
On 16 July 2026, air quality conditions in Bay Bridge 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 Bay Bridge?
Bay Bridge experiences the same seasonal air quality swings as the rest of San Francisco. Typically, late winter and spring tend to have the cleanest conditions, once winter rains settle in, while heat and dryness combine from July onward to raise both ozone and smoke risk. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Bay Bridge 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