San Francisco vs Chicago

Live air quality comparison. Chicago has cleaner air right now.

United States
San Francisco
54
Moderate
United States
Chicago
40
Good
MetricSan FranciscoChicago
AQI5440
PM2.512.8 μg/m³10.8 μg/m³
PM1018.5 μg/m³11.7 μg/m³
Ozone80 ppb66 ppb
NO23.6 ppb13.1 ppb

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