San Francisco vs Chicago

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

United States
San Francisco
51
Moderate
United States
Chicago
61
Moderate
MetricSan FranciscoChicago
AQI5161
PM2.59.6 μg/m³14.2 μg/m³
PM1014.8 μg/m³14.5 μg/m³
Ozone67 ppb86 ppb
NO27 ppb25.8 ppb

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