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 Arkansas Homes
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All States
Alabama
AQI 42Alaska
AQI 18Arizona
AQI 42Arkansas
AQI 96California
AQI 53Colorado
AQI 41Connecticut
AQI 34Delaware
AQI 31District of Columbia
AQI 41Florida
AQI 42Georgia
AQI 49Hawaii
AQI 15Idaho
AQI 38Illinois
AQI 36Indiana
AQI 41Iowa
AQI 32Kansas
AQI 64Kentucky
AQI 57Louisiana
AQI 45Maine
AQI 29Maryland
AQI 43Massachusetts
AQI 33Michigan
AQI 32Minnesota
AQI 25Mississippi
AQI 75Missouri
AQI 62Montana
AQI 21Nebraska
AQI 22Nevada
AQI 48New Hampshire
AQI 24New Jersey
AQI 47New Mexico
AQI 37New York
AQI 47North Carolina
AQI 53North Dakota
AQI 24Ohio
AQI 49Oklahoma
AQI 71Oregon
AQI 29Pennsylvania
AQI 46Rhode Island
AQI 43South Carolina
AQI 42South Dakota
AQI 24Tennessee
AQI 61Texas
AQI 44Utah
AQI 52Vermont
AQI 27Virginia
AQI 33Washington
AQI 33West Virginia
AQI 55Wisconsin
AQI 41Wyoming
AQI 31Understanding 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.