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.

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Understanding the Air Quality Index

The AQI tells you how clean or polluted your air is, and what health effects might be a concern.

0-50
51-100
101-150
151-200
201-300
301-500
Good
Air quality is satisfactory, and air pollution poses little or no risk.
Moderate
Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Unhealthy for Sensitive Groups
Members of sensitive groups may experience health effects. The general public is less likely to be affected.
Unhealthy
Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy
Health alert: The risk of health effects is increased for everyone.
Hazardous
Health warning of emergency conditions: everyone is more likely to be affected.

Best Air Quality Today

Cities with the cleanest air

1Anchorage, AK
AQI 20
2Honolulu, HI
AQI 25
3Seattle, WA
AQI 25
4Miami, FL
AQI 28
5Syracuse, NY
AQI 35
View all rankings →

Poorest Air Quality Today

Cities requiring caution

1Bakersfield, CA
AQI 120
2Fresno, CA
AQI 104
3Salt Lake City, UT
AQI 83
4Los Angeles, CA
AQI 74
5Detroit, MI
AQI 70
View all rankings →

Explore Air Quality Data

Dive deeper into air quality trends, rankings, and health information

Cleanest Cities

Top 50 US cities with the best air quality and healthiest living conditions

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Most Polluted Cities

Cities with elevated pollution levels requiring health precautions

View areas of concern

Cities by State

Browse all monitored cities organized by state with AQI data

Browse all cities

Active AQI Alerts

Real-time air quality alerts and health advisories for your area

View active alerts

Health Guide

Protection strategies and health information for sensitive groups

Learn more

Complete Rankings

Full rankings of all cities from best to worst air quality

View all rankings

Health Calculators

Calculate safe outdoor time, health risks, and mask requirements

Use calculators

Seasonal Patterns

Month-by-month AQI trends, wildfire season, inversions, and travel planning

Explore seasonal guides

Activity Guides

Air quality guidelines for running, cycling, hiking, sports, and 10+ more activities

View activity guides

Browse by State

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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