Boston vs Chicago

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

United States
Boston
33
Good
United States
Chicago
40
Good
MetricBostonChicago
AQI3340
PM2.512.3 μg/m³10.8 μg/m³
PM1012.8 μg/m³11.7 μg/m³
Ozone58 ppb66 ppb
NO217.9 ppb13.1 ppb

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