Air quality in Alaska
EPA monitors report from 8 of Alaska’s 30 counties. That is the honest limit of this page: the other 22 are not measured, not clean. In 2025 the most affected monitored county was Fairbanks North Star Borough, with 20 days above the moderate category.
8
Counties with monitors
22
Counties without
24
Days above moderate, 2025
Summed across monitored counties
10.7%
Adults with asthma
Population-weighted county estimate
County by county
Monitored Alaska counties
GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
| County | 90th %ile AQI | Above moderate | Max AQI | 2025 days by category |
|---|---|---|---|---|
| Fairbanks North Star Borough | 85 | 20 | 190 | |
| Matanuska-Susitna Borough | 47 | 2 | 141 | |
| Anchorage Municipality | 61 | 1 | 110 | |
| Juneau City and Borough | 58 | 1 | 138 | |
| Aleutians East Borough | 21 | 0 | 58 | |
| Denali Borough | 43 | 0 | 54 | |
| Kenai Peninsula Borough | 16 | 0 | 28 | |
| North Slope Borough | 23 | 0 | 72 |
EPA Air Quality System annual summaries by county, 2025. The 90th percentile AQI describes a day worse than nine out of ten, which is a steadier measure than the annual maximum a single wildfire can set.
Not measured
22 counties without a monitor
No EPA monitor reported from these counties, so there is no air quality record to publish. Their radon zone is known, and radon is measured in the building rather than the air outside it.
- Aleutians West Census Area
- Bethel Census Area
- Bristol Bay Borough
- Chugach Census Area
- Copper River Census Area
- Dillingham Census Area
- Haines Borough
- Hoonah-Angoon Census Area
- Ketchikan Gateway Borough
- Kodiak Island Borough
- Kusilvak Census Area
- Lake and Peninsula Borough
- Nome Census Area
- Northwest Arctic Borough
- Petersburg Borough
- Prince of Wales-Hyder Census Area
- Sitka City and Borough
- Skagway Municipality
- Southeast Fairbanks Census Area
- Wrangell City and Borough
- Yakutat City and Borough
- Yukon-Koyukuk Census Area
Other states
Air quality elsewhere
- Alabama
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming