Boston vs Chicago

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

United States
Boston
69
Moderate
United States
Chicago
61
Moderate
MetricBostonChicago
AQI6961
PM2.518.2 μg/m³4.1 μg/m³
PM1019.4 μg/m³4.2 μg/m³
Ozone113 ppb107 ppb
NO23 ppb6.1 ppb

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