Worst air pollution San Francisco, today and tomorrow
Today (15 July): Air quality in San Francisco is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 10:00 AM (O3: 30.8/100).
Tomorrow (16 July 2026): Air quality in San Francisco is fair. All pollutants stay as today. Pollution peaks around 9:00 AM (O3: 28.6/100). 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 in Sonora reflects the flat Sonoran Desert border corridor position, with vehicle traffic on surrounding roads and the agricultural and border trade character contributing modest local sources. Windblown Sonoran Desert dust contributes elevated PM10, while the flat desert terrain allows reasonable dispersal and the area generally maintains moderate to good northwestern Mexican Sonoran Desert border readings throughout most of the year.
Today - 15 July | Pollution peaks at 10:00
AQI:
Fair
30.8/100
PM2.5 (fine particles):
Good
9.8/100
PM10 (coarse particles):
Good
11.3/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
30.8/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
2.4/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Fair
28.6/100
PM2.5 (fine particles):
Good
9.7/100
PM10 (coarse particles):
Good
13.7/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
28.6/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
0.7/100
PM1 (ultrafine particles):
Good
2.7/100
Frequently Asked Questions
Is air quality bad in San Francisco right now?
On 15 July 2026, overall air quality in San Francisco is fair. AQI is the main air quality indicator at 30.8/100. Pollution peaks around 10:00 AM (O3: 30.8/100).
Will air quality be worse tomorrow in San Francisco?
On 16 July 2026, air quality conditions in San Francisco will be similar to today, with AQI forecast at fair at 28.6/100. Pollution peaks around 9:00 AM (O3: 28.6/100).
When is air pollution at its worst in San Francisco?
In San Francisco, road traffic as well as farming and agricultural processing are the main local sources, with conditions worsening when dry spells bring strong winds. These wind events can carry dust in from the surrounding arid landscape. This is most noticeable during spring and autumn wind events.
Are air quality levels in San Francisco 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