Boston vs Chicago

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

United States
Boston
40
Good
United States
Chicago
29
Good
MetricBostonChicago
AQI4029
PM2.54.9 μg/m³2.5 μg/m³
PM104.9 μg/m³2.5 μg/m³
Ozone49 ppb59 ppb
NO24 ppb12.9 ppb

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