Worst air pollution Alcatraz Island - San Francisco, today and tomorrow
Today (15 July): Air quality in Alcatraz Island 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: 37.9/100).
Tomorrow (16 July 2026): Air quality in Alcatraz Island is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 40.2/100). 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.
San Francisco's Alcatraz Island air quality benefits from its exceptional San Francisco Bay and Golden Gate island position, with the Bay's powerful tidal breezes and the Golden Gate's channelled Pacific winds providing among the Bay Area's most outstanding maritime ventilation. Vehicle traffic is essentially absent on the island, while the extraordinary open-water bay position on all sides and the Golden Gate's powerful maritime exposure generally maintain Alcatraz among the Bay Area's most reliably ventilated major attractions throughout most of the year.
Today - 15 July | Pollution peaks at 09:00
AQI:
Fair
37.9/100
PM2.5 (fine particles):
Good
10.7/100
PM10 (coarse particles):
Good
6.8/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Fair
37.9/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
5.8/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 10:00
AQI:
Medium
40.2/100
PM2.5 (fine particles):
Good
16.1/100
PM10 (coarse particles):
Good
7.7/100
NO2 (nitrogen dioxide):
Good
0/100
O3 (ozone):
Medium
40.2/100
SO2 (sulfur dioxide):
Good
0/100
CO (carbon monoxide):
Good
0/100
HCHO (formaldehyde):
Good
1.7/100
PM1 (ultrafine particles):
Good
10.7/100
Other Landmarks in San Francisco
Sports venues in San Francisco
Frequently Asked Questions
Is air quality bad in Alcatraz Island right now?
On 15 July 2026, overall air quality in Alcatraz Island is fair. AQI is the main air quality indicator at 37.9/100. Pollution peaks around 9:00 AM (O3: 37.9/100).
Will air quality be worse tomorrow in Alcatraz Island?
On 16 July 2026, air quality conditions in Alcatraz Island will be better than today, with AQI forecast at medium at 40.2/100. Pollution peaks around 10:00 AM (O3: 40.2/100).
When is air pollution at its worst in Alcatraz Island?
Like the rest of San Francisco, Alcatraz Island sees air quality change through the year: spring typically offers the best combination of mild weather and clear air, but wildfire smoke season from July through October is the dominant concern, sometimes overwhelming other pollution sources for days at a time. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Alcatraz Island 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