Air Quality by State
Browse comprehensive air quality data for all 51 US states and territories. Each state page provides detailed city-by-city AQI information, regional air quality patterns, and health recommendations based on official EPA data.
States with Cleanest Air
View all cleanest citiesStates Requiring More Attention
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All States
Alabama
AQI 38Alaska
AQI 57Arizona
AQI 40Arkansas
AQI 45California
AQI 27Colorado
AQI 52Connecticut
AQI 24Delaware
AQI 24District of Columbia
AQI 29Florida
AQI 36Georgia
AQI 27Hawaii
AQI 34Idaho
AQI 24Illinois
AQI 18Indiana
AQI 42Iowa
AQI 56Kansas
AQI 46Kentucky
AQI 41Louisiana
AQI 34Maine
AQI 24Maryland
AQI 22Massachusetts
AQI 26Michigan
AQI 27Minnesota
AQI 57Mississippi
AQI 36Missouri
AQI 48Montana
AQI 7Nebraska
AQI 32Nevada
AQI 43New Hampshire
AQI 17New Jersey
AQI 23New Mexico
AQI 33New York
AQI 22North Carolina
AQI 24North Dakota
AQI 22Ohio
AQI 22Oklahoma
AQI 47Oregon
AQI 30Pennsylvania
AQI 25Rhode Island
AQI 30South Carolina
AQI 22South Dakota
AQI 47Tennessee
AQI 33Texas
AQI 41Utah
AQI 32Vermont
AQI 19Virginia
AQI 26Washington
AQI 30West Virginia
AQI 38Wisconsin
AQI 13Wyoming
AQI 27Understanding State Air Quality Data
Air quality varies significantly across different states due to a combination of geographic, climatic, economic, and demographic factors. Understanding these variations helps you make informed decisions about outdoor activities, travel, and relocation.
Factors Affecting State Air Quality
- Population density: More people typically means more vehicle emissions and energy consumption
- Industrial activity: Manufacturing, power generation, and mining contribute to local pollution
- Geography: Valleys and basins can trap pollution, while coastal areas often have cleaner air
- Climate: Hot, sunny weather increases ozone formation; temperature inversions trap pollutants
- Wildfire risk: Western states face seasonal smoke impacts from wildfires
How to Use This Data
- Click any state to see detailed city-level air quality data
- Compare states when planning relocation or extended travel
- State averages represent typical conditions; check specific cities for detailed data
- Consider seasonal variations when comparing long-term air quality
The average AQI shown for each state is calculated from all monitored cities within that state. Air quality can vary significantly within a state, so we recommend checking individual city pages for the most accurate local information.
Official EPA Data
All air quality data comes directly from the EPA's official monitoring network.