Outdoor exercise
Is it safe to run in Chicago today?
Live AQI and the best running window for Chicago 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 Chicago
34
Good
Updated 21 Jul 2026, 05:00
Best window to run (next 12h)
13:00 – 14:00 · lowest ~12 AQI
Hourly AQI (next 12 hours)
Now
38
06:00
44
07:00
43
08:00
37
09:00
29
10:00
22
11:00
18
12:00
14
13:00
12
14:00
13
15:00
16
16:00
14
What affects air quality for runners in Chicago
Chicago air quality reflects a mix of urban traffic emissions, industrial influence, and changing lake-driven meteorology. Nitrogen dioxide tends to rise near expressways and freight corridors, while particulate levels vary across neighborhoods with different land use and building density. Lake breeze boundaries can shift pollution concentrations within the metro area.