Outdoor exercise
Is it safe to run in San Francisco today?
Live AQI and the best running window for San Francisco based on Open-Meteo hourly forecasts.
Running today
Yes — generally safe for outdoor running
Current conditions are good for outdoor running, including longer or higher-intensity sessions. Sensitive groups — young children, older adults, and people with asthma or heart conditions — can generally exercise outdoors as normal, but it is still worth checking the hourly forecast below in case conditions shift later in the day.
Current AQI in San Francisco
43
Good
Updated 20 Jul 2026, 22:00
Best window to run (next 12h)
08:00 – 09:00 · lowest ~42 AQI
Hourly AQI (next 12 hours)
Now
48
23:00
48
00:00
49
01:00
51
02:00
49
03:00
51
04:00
52
05:00
53
06:00
52
07:00
50
08:00
45
09:00
42
What affects air quality for runners in San Francisco
San Francisco often benefits from Pacific airflow, yet Bay Area air quality varies sharply by neighbourhood and season. Bridge approaches and dense urban corridors can show elevated nitrogen dioxide, while regional wildfire smoke may push PM2.5 into unhealthy bands across the entire metro.