New York, NY 54° Los Angeles, CA 66° Chicago, IL 41° Houston, TX 63° Miami, FL 73° Phoenix, AZ 62° Seattle, WA 52° Denver, CO 42° Toronto, ON 39° 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
56
Moderate
PM2.5: 14.3 µg/m³
Los Angeles
115
Unhealthy for Sensitive Groups
PM2.5: 41.1 µg/m³
Chicago
27
Good
PM2.5: 1.5 µg/m³
Houston
38
Good
PM2.5: 9.2 µg/m³
Phoenix
51
Moderate
PM2.5: 12.1 µg/m³
Philadelphia
40
Good
PM2.5: 9.7 µg/m³
San Antonio
25
Good
PM2.5: 3.9 µg/m³
San Diego
77
Moderate
PM2.5: 24.5 µg/m³
Dallas
45
Good
PM2.5: 10.7 µg/m³
Miami
43
Good
PM2.5: 10.2 µg/m³
Atlanta
36
Good
PM2.5: 8.6 µg/m³
Boston
36
Good
PM2.5: 8.7 µg/m³
San Francisco
51
Moderate
PM2.5: 12.3 µg/m³
Seattle
67
Moderate
PM2.5: 19.5 µg/m³
Denver
55
Moderate
PM2.5: 13.8 µg/m³
Washington
56
Moderate
PM2.5: 14.7 µg/m³
Minneapolis
27
Good
PM2.5: 1.7 µg/m³
Las Vegas
57
Moderate
PM2.5: 15.1 µg/m³
Orlando
40
Good
PM2.5: 9.5 µg/m³
Charlotte
54
Moderate
PM2.5: 13.3 µg/m³
Toronto
20
Good
PM2.5: 3.5 µg/m³
Montréal
36
Good
PM2.5: 8.6 µg/m³
Vancouver
58
Moderate
PM2.5: 15.4 µg/m³
Ottawa
24
Good
PM2.5: 1.6 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.
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Updated: 8:01 AM