Median AQI
11
Good
Alaska · County air quality · 2025
Aleutians East County, Alaska
Median AQI 11 (Good). 95.0% of monitored days rated Good, direct from EPA Air Quality System stations.
- 11
- Median AQI
- 95.0%
- Good-air days
- 0
- Unhealthy days
- 89%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Aleutians East County's air is good on balance, cleaner than most US counties, a median AQI of 11 with 95.0% of 20 monitored days in the Good band, driven mainly by PM2.5.
- 11
- median AQI · Good
- 95.0%
- days rated Good
- PM2.5
- main pollutant
- 89%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 58.
Data updated July 2026
- Good · 19 d · 95.0%
- Moderate · 1 d · 5.0%
How did Aleutians East County's air break down in 2025?
Across 20 monitored days, 19 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 58 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 20 days monitored. Median AQI: 11 (Good).
Insights: Aleutians East County, Alaska. EPA monitors recorded a median Air Quality Index of 11 across 20 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 19 (95%) fell in the Good band (AQI 0–50), 1 (5%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 32, while the worst single-day peak hit 58 (Moderate). Residents averaged about 28.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (20 days). Across the 2020–2025 trend window, good days shifted by -102 and the median AQI moved +0 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 58, moderate but never Unhealthy. Nearby counties show comparable readings: Anchorage (80.8% good, AQI 24); Denali (100.0% good, AQI 38); Fairbanks North Star (61.5% good, AQI 42); Juneau (85.1% good, AQI 21); Kenai Peninsula (100.0% good, AQI 8); Matanuska-Susitna (90.3% good, AQI 7).
Air Quality Summary
Good Days
95.0%
19 of 20 monitored days
20.0pp vs 75% target
Max AQI Recorded
58
Moderate
Health Grade
Excellent
90th-pct AQI 32
Aleutians East County, Good days share 95.0%
National avg
Share of monitored days at AQI 0-50 (Good band).
Aleutians East County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 20 monitored days across EPA AQI categories.
Good
19
95%
Moderate
1
5%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Aleutians East County.
- PM2.5 · 20 days · 100.0%
Health Impact Assessment
Excellent
Aleutians East County's air quality is rated Excellent based on 95.0% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 95.0% of monitored days in 2025, with a median AQI of 11. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 20 of 20 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Aleutians East County. Best year: 2020 (121 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 121 | 0 | 0 | 0 | 11 | 41 |
| 2021 | 117 | 1 | 0 | 0 | 13 | 51 |
| 2022 | 119 | 2 | 0 | 0 | 12 | 74 |
| 2023 | 120 | 1 | 0 | 0 | 11 | 55 |
| 2024 | 111 | 1 | 0 | 0 | 13 | 53 |
| 2025 | 19 | 1 | 0 | 0 | 11 | 58 |
How does Aleutians East County compare?
How Aleutians East County compares
Good-day share better than US avg
Aleutians East County 95.0%
Anchorage County, Alaska 80.8%
US average 76.5%
Median AQI better than US avg
Aleutians East County 11
Anchorage County, Alaska 24
US average 38
Unhealthy days / yr about average
Aleutians East County 0
Anchorage County, Alaska 0
US average 0
Other Counties in Alaska
Air quality comparison for nearby counties in Alaska.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Aleutians East County.
Lincoln County, New Mexico
AQI 11 · 89.5% good
Beaverhead County, Montana
AQI 12 · 100.0% good
Columbiana County, Ohio
AQI 12 · 100.0% good
Cook County, Minnesota
AQI 12 · 100.0% good
Lincoln County, Wyoming
AQI 10 · 97.8% good
Los Alamos County, New Mexico
AQI 10 · 100.0% good
What Aleutians East County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 11 means for exposure. Health guidance
- See how Aleutians East County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Aleutians East County with its Alaska neighbours before drawing a conclusion about the region. All of Alaska
Based on 20 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Aleutians East County, Alaska? ▼
Aleutians East County has a median Air Quality Index (AQI) of 11, rated "Good." 95.0% of monitored days (19 out of 20) had good air quality in 2025.
What is the main pollutant in Aleutians East County? ▼
The primary pollutant in Aleutians East County is Fine Particles (PM2.5), which was the main AQI driver on 20 days (100% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Aleutians East County have? ▼
In 2025, Aleutians East County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 58.
Is the air quality in Aleutians East County getting better or worse? ▼
Air quality in Aleutians East County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 121 good days. Worst year: 2025 with 19 good days.
What does AQI 11 mean for health? ▼
Aleutians East County's median AQI of 11 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Aleutians East County compare to other counties in Alaska? ▼
Aleutians East County has 95.0% good air days. Nearby counties in Alaska: Anchorage (80.8% good), Denali (100.0% good), Fairbanks North Star (61.5% good), Juneau (85.1% good), Kenai Peninsula (100.0% good), Matanuska-Susitna (90.3% good).
What is the 90th percentile AQI in Aleutians East County? ▼
The 90th percentile AQI for Aleutians East County is 32, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 58 (Moderate).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.