New York, NY 61° Los Angeles, CA 87° Chicago, IL 69° Houston, TX 91° Miami, FL 84° Phoenix, AZ 92° Seattle, WA 65° Denver, CO 83° Toronto, ON 77° Vancouver, BC 55°

Air quality today

The current AQI picture across major US cities.

Good 0-50Moderate 51-100Sensitive 101-150Unhealthy 151-200Very Unhealthy 201-300
New York
35
Good
PM2.5: 8.4 µg/m³
Los Angeles
56
Moderate
PM2.5: 14.4 µg/m³
Chicago
49
Good
PM2.5: 4.2 µg/m³
Houston
115
Unhealthy for Sensitive Groups
PM2.5: 16.1 µg/m³
Phoenix
49
Good
PM2.5: 7.9 µg/m³
Philadelphia
29
Good
PM2.5: 4.5 µg/m³
San Antonio
95
Moderate
PM2.5: 10 µg/m³
San Diego
67
Moderate
PM2.5: 19.7 µg/m³
Dallas
90
Moderate
PM2.5: 11.4 µg/m³
Miami
85
Moderate
PM2.5: 9.7 µg/m³
Atlanta
85
Moderate
PM2.5: 5.9 µg/m³
Boston
29
Good
PM2.5: 4.9 µg/m³
San Francisco
44
Good
PM2.5: 10.6 µg/m³
Seattle
34
Good
PM2.5: 7.2 µg/m³
Denver
48
Good
PM2.5: 2.4 µg/m³
Washington
26
Good
PM2.5: 3.6 µg/m³
Minneapolis
40
Good
PM2.5: 9.7 µg/m³
Las Vegas
43
Good
PM2.5: 2.5 µg/m³
Orlando
71
Moderate
PM2.5: 5 µg/m³
Charlotte
49
Good
PM2.5: 6.3 µg/m³
Toronto
34
Good
PM2.5: 3.9 µg/m³
Montréal
27
Good
PM2.5: 4.5 µg/m³
Vancouver
34
Good
PM2.5: 4.1 µg/m³
Ottawa
37
Good
PM2.5: 2.7 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.
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Updated: 5:55 PM