San Francisco vs Chicago

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

United States
San Francisco
40
Good
United States
Chicago
58
Moderate
MetricSan FranciscoChicago
AQI4058
PM2.57.5 μg/m³15 μg/m³
PM1011.3 μg/m³15.3 μg/m³
Ozone83 ppb32 ppb
NO24.3 ppb42.2 ppb

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