Chicago vs Houston

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

United States
Chicago
40
Good
United States
Houston
42
Good
MetricChicagoHouston
AQI4042
PM2.510.8 μg/m³3.2 μg/m³
PM1011.7 μg/m³3.6 μg/m³
Ozone66 ppb98 ppb
NO213.1 ppb4.2 ppb

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