Real-Time Air Quality for Every US City
Check current AQI levels, forecasts, and health recommendations. Protect yourself and your family with accurate air quality data.
Understanding the Air Quality Index (AQI)
0-50
Good
51-100
Moderate
101-150
Unhealthy for Sensitive Groups
151-200
Unhealthy
201-300
Very Unhealthy
301-500
Hazardous
Best Air Quality Today
Cities with the cleanest air
Poorest Air Quality Today
Cities requiring caution
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What is the Air Quality Index?
The Air Quality Index (AQI) is the EPA's tool for communicating how clean or polluted the air is in your area. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air.
The AQI is calculated for five major air pollutants regulated by the Clean Air Act: ground-level ozone, particle pollution (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide.
Who is Most at Risk?
- People with asthma or other respiratory conditions
- Children and older adults
- People who work or exercise outdoors
- People with heart disease
How to Protect Yourself
- Check the AQI before outdoor activities
- Limit outdoor exercise when AQI is unhealthy
- Keep windows closed on poor air quality days
- Use air purifiers with HEPA filters indoors
- Wear N95 masks during very poor air quality