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 52Alaska
AQI 37Arizona
AQI 51Arkansas
AQI 45California
AQI 62Colorado
AQI 52Connecticut
AQI 59Delaware
AQI 38District of Columbia
AQI 51Florida
AQI 46Georgia
AQI 63Hawaii
AQI 10Idaho
AQI 61Illinois
AQI 53Indiana
AQI 54Iowa
AQI 41Kansas
AQI 40Kentucky
AQI 38Louisiana
AQI 44Maine
AQI 37Maryland
AQI 46Massachusetts
AQI 58Michigan
AQI 59Minnesota
AQI 53Mississippi
AQI 58Missouri
AQI 61Montana
AQI 47Nebraska
AQI 55Nevada
AQI 38New Hampshire
AQI 51New Jersey
AQI 45New Mexico
AQI 47New York
AQI 47North Carolina
AQI 44North Dakota
AQI 54Ohio
AQI 54Oklahoma
AQI 40Oregon
AQI 31Pennsylvania
AQI 55Rhode Island
AQI 60South Carolina
AQI 43South Dakota
AQI 39Tennessee
AQI 56Texas
AQI 46Utah
AQI 82Vermont
AQI 56Virginia
AQI 50Washington
AQI 44West Virginia
AQI 54Wisconsin
AQI 52Wyoming
AQI 64Understanding 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.