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 60Alaska
AQI 18Arizona
AQI 52Arkansas
AQI 40California
AQI 57Colorado
AQI 48Connecticut
AQI 57Delaware
AQI 38District of Columbia
AQI 45Florida
AQI 42Georgia
AQI 51Hawaii
AQI 15Idaho
AQI 44Illinois
AQI 59Indiana
AQI 52Iowa
AQI 57Kansas
AQI 63Kentucky
AQI 64Louisiana
AQI 56Maine
AQI 57Maryland
AQI 48Massachusetts
AQI 48Michigan
AQI 55Minnesota
AQI 61Mississippi
AQI 39Missouri
AQI 52Montana
AQI 56Nebraska
AQI 50Nevada
AQI 52New Hampshire
AQI 57New Jersey
AQI 50New Mexico
AQI 54New York
AQI 52North Carolina
AQI 51North Dakota
AQI 55Ohio
AQI 53Oklahoma
AQI 49Oregon
AQI 48Pennsylvania
AQI 55Rhode Island
AQI 43South Carolina
AQI 53South Dakota
AQI 35Tennessee
AQI 50Texas
AQI 55Utah
AQI 85Vermont
AQI 41Virginia
AQI 45Washington
AQI 39West Virginia
AQI 50Wisconsin
AQI 48Wyoming
AQI 52Understanding 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.