San Francisco vs Chicago

Live air quality comparison. San Francisco has cleaner air right now.

United States
San Francisco
56
Moderate
United States
Chicago
61
Moderate
MetricSan FranciscoChicago
AQI5661
PM2.510.9 μg/m³4.1 μg/m³
PM1016.5 μg/m³4.2 μg/m³
Ozone46 ppb107 ppb
NO25.3 ppb6.1 ppb

Lower values mean cleaner air. Updated hourly. Sources: OpenAQ, Open-Meteo.