Alaska · County air quality · 2025

Aleutians East County, Alaska

Limited EPA sample: 99 monitored days, below the 100-day floor for a full-year verdict. The figures below describe only those reported days.

11
Sample median AQI
99.0%
Good in sample
0
Unhealthy in sample
99
100-day comparison floor

Aleutians East County has only 99 EPA-monitored days in 2025, below the 100-day annual floor

According to the U.S. EPA Air Quality System, Aleutians East County, Alaska reported 99 monitored days in 2025. That sample is too thin for a full-year air-quality grade or peer ranking. Use the figures only as the reported-day record, and check AirNow for current conditions.

Data source EPA Air Quality System (AQS)

Monitored days
Aleutians East County reported 99 monitored days in 2025, below the 100-day floor: sample-only, not a full-year peer rank.
Sample median AQI
Sample median AQI: 11
Annual floor
Annual floor: 100

Data updated August 2026

Aleutians East County AQI category distribution Stacked-segment bar showing the share of monitored days that fell in each EPA AQI category, Good, Moderate, USG, Unhealthy, Very Unhealthy, Hazardous, with median AQI marker. AQI category distribution 99 monitored days G Median AQI 11 0 50 100 150 200 300 500 Aleutians East County
  • Good · 98 d · 99.0%
  • Moderate · 1 d · 1.0%

How did Aleutians East County's reported sample break down in 2025?

Across 99 monitored days, 98 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 →

Pollutant Breakdown

Days where each pollutant was the primary driver of AQI readings in Aleutians East County.

Aleutians East County, Alaska criteria pollutant distribution Stratified-band visualization showing the share of monitored days each criteria pollutant (PM2.5, PM10, O3, NO2, CO) was the primary AQI driver. PM2.5 · 100.0% 0% 25% 50% 75% 100% Aleutians East County, Alaska · 99 monitored days Criteria pollutant column
  • PM2.5 · 99 days · 100.0%

Sample Coverage and Health Context

Limited sample

Aleutians East County has no annual health grade because only 99 days were reported, below the 100-day floor. The 99.0% Good-day share describes only that sample.

Reported days do not reveal what happened during unmonitored parts of the year, including seasonal smoke, ozone, or inversion periods. Use these values as a description of the available EPA sample only, and check AirNow.gov for current health guidance.

The dominant pollutant is PM2.5, driving AQI on 99 of 99 monitored days.

5-Year Air Quality Trend

Air quality is stable in Aleutians East County. Highest Good-day share: 2020 (100.0%, 121 of 121 monitored days). The 2025 row is shown for transparency but excluded from the direction because it has fewer than 100 monitored days.

Year Good Moderate USG Unhealthy Median AQI
2020 121 0 0 0 11
2021 117 1 0 0 13
2022 119 2 0 0 12
2023 120 1 0 0 11
2024 111 1 0 0 13
2025 98 1 0 0 11

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. Spotted a figure that looks wrong? Report a correction.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Aleutians East County, Alaska · 2020–2025

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Every figure on PlainAirData 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.