New York, NY 30° Los Angeles, CA 21° Chicago, IL 26° Houston, TX 36° Miami, FL 36° Phoenix, AZ 29° Seattle, WA 18° Denver, CO 25° Toronto, ON 28° Vancouver, BC 20°

Air quality today

The current AQI picture across major US cities.

Good 0-50Moderate 51-100Sensitive 101-150Unhealthy 151-200Very Unhealthy 201-300

PM2.5: 8.9 µg/m³

PM2.5: 15.3 µg/m³

Unhealthy for Sensitive Groups

PM2.5: 11.5 µg/m³

PM2.5: 18.5 µg/m³

PM2.5: 10.5 µg/m³

PM2.5: 12 µg/m³

PM2.5: 5.1 µg/m³

PM2.5: 14.1 µg/m³

PM2.5: 11.4 µg/m³

PM2.5: 6.1 µg/m³

PM2.5: 8.9 µg/m³

PM2.5: 10.2 µg/m³

PM2.5: 5.4 µg/m³

PM2.5: 16 µg/m³

PM2.5: 7.1 µg/m³

Unhealthy for Sensitive Groups

PM2.5: 5.9 µg/m³

PM2.5: 15.9 µg/m³

PM2.5: 7.4 µg/m³

PM2.5: 7.5 µg/m³

PM2.5: 5.3 µg/m³

PM2.5: 8.5 µg/m³

PM2.5: 6.2 µg/m³

PM2.5: 22.9 µg/m³

PM2.5: 4.7 µg/m³

Understanding the AQI

US Air Quality Index (EPA)

The EPA's Air Quality Index turns pollutant concentrations — fine particles (PM2.5), coarse particles (PM10), ground-level ozone and nitrogen dioxide — into one 0-500 number. Green (0-50) means clean air; yellow (51-100) is acceptable; orange (101-150) starts to affect people with asthma or heart conditions; red and above (151+) is unhealthy for everyone. Wildfire smoke and summer ozone are the two biggest drivers of bad-air days in the US.

DATA

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Updated: 2:46 PM