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 concernExtra Protection for Utah Homes
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All States
Alabama
AQI 25Alaska
AQI 18Arizona
AQI 42Arkansas
AQI 48California
AQI 49Colorado
AQI 39Connecticut
AQI 15Delaware
AQI 23District of Columbia
AQI 37Florida
AQI 46Georgia
AQI 46Hawaii
AQI 28Idaho
AQI 38Illinois
AQI 36Indiana
AQI 42Iowa
AQI 42Kansas
AQI 54Kentucky
AQI 35Louisiana
AQI 30Maine
AQI 13Maryland
AQI 26Massachusetts
AQI 16Michigan
AQI 52Minnesota
AQI 15Mississippi
AQI 26Missouri
AQI 38Montana
AQI 58Nebraska
AQI 23Nevada
AQI 55New Hampshire
AQI 12New Jersey
AQI 22New Mexico
AQI 27New York
AQI 31North Carolina
AQI 23North Dakota
AQI 18Ohio
AQI 40Oklahoma
AQI 58Oregon
AQI 31Pennsylvania
AQI 29Rhode Island
AQI 18South Carolina
AQI 27South Dakota
AQI 19Tennessee
AQI 38Texas
AQI 41Utah
AQI 63Vermont
AQI 26Virginia
AQI 23Washington
AQI 36West Virginia
AQI 22Wisconsin
AQI 34Wyoming
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.