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
View all areas of concernAll States
Alabama
AQI 66Alaska
AQI 21Arizona
AQI 58Arkansas
AQI 56California
AQI 59Colorado
AQI 52Connecticut
AQI 52Delaware
AQI 56District of Columbia
AQI 51Florida
AQI 44Georgia
AQI 60Hawaii
AQI 14Idaho
AQI 46Illinois
AQI 55Indiana
AQI 53Iowa
AQI 47Kansas
AQI 53Kentucky
AQI 52Louisiana
AQI 50Maine
AQI 64Maryland
AQI 38Massachusetts
AQI 44Michigan
AQI 57Minnesota
AQI 56Mississippi
AQI 50Missouri
AQI 56Montana
AQI 54Nebraska
AQI 40Nevada
AQI 48New Hampshire
AQI 42New Jersey
AQI 41New Mexico
AQI 51New York
AQI 49North Carolina
AQI 48North Dakota
AQI 47Ohio
AQI 62Oklahoma
AQI 44Oregon
AQI 52Pennsylvania
AQI 52Rhode Island
AQI 63South Carolina
AQI 54South Dakota
AQI 65Tennessee
AQI 50Texas
AQI 52Utah
AQI 60Vermont
AQI 61Virginia
AQI 44Washington
AQI 40West Virginia
AQI 43Wisconsin
AQI 51Wyoming
AQI 48Understanding 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.