New York, NY 86° Los Angeles, CA 70° Chicago, IL 78° Houston, TX 96° Miami, FL 96° Phoenix, AZ 84° Seattle, WA 65° Denver, CO 76° Toronto, ON 83° Vancouver, BC 69°

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: 9.3 µg/m³

PM2.5: 15.7 µg/m³

Unhealthy for Sensitive Groups

PM2.5: 11 µg/m³

PM2.5: 18.5 µg/m³

PM2.5: 11.1 µg/m³

PM2.5: 10.3 µg/m³

PM2.5: 5.5 µg/m³

PM2.5: 14.8 µg/m³

PM2.5: 12.3 µg/m³

PM2.5: 5.8 µg/m³

PM2.5: 9.6 µg/m³

PM2.5: 10.2 µg/m³

PM2.5: 5.2 µg/m³

PM2.5: 15.4 µg/m³

PM2.5: 8 µg/m³

Unhealthy for Sensitive Groups

PM2.5: 5.2 µg/m³

PM2.5: 13.2 µg/m³

PM2.5: 7.9 µg/m³

PM2.5: 7.7 µg/m³

PM2.5: 5.3 µg/m³

PM2.5: 6.9 µg/m³

PM2.5: 6.2 µg/m³

PM2.5: 23.3 µg/m³

PM2.5: 5.6 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: 1:41 PM