Alaska · County air quality · 2025
Fairbanks North Star County, Alaska
Median AQI 44 (Good). 56.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 44
- Median AQI
- 56.4%
- Good-air days
- 10
- Unhealthy days
- 11%
- Cleaner than US counties
Fairbanks North Star County's 2025 annual median AQI is 44 (Good), with 56.4% Good days
According to the U.S. EPA Air Quality System, Fairbanks North Star County, Alaska posted a 2025 median AQI of 44 (Good) across 365 monitored days, with 56.4% rated Good and 10 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Fairbanks North Star County's 56.4% Good-day share places it cleaner than 11% of US counties in 2025.
- Closest median-AQI peer
- Allegan County (63.9% Good, median AQI 44) is the closest nationwide median-AQI peer to Fairbanks North Star County.
- 2020–2025 trend
- Fairbanks North Star County's floor-qualifying Good-day share is worsening from 2020 to 2025 (63.1% → 56.4%).
- Median AQI
- Median AQI: 44
According to the 2025 EPA AQS county release on PlainAirData, Fairbanks North Star County, Alaska ranks #680 of 951 by median AQI (44) and #844 by good-day share (56.4%). Ponce County, Puerto Rico is #1 of 951 by median AQI (3, 91.4% Good days) at good-day-share #159 ≠ largest of 7 at 100.0% Good days #1 by good-day share (100.0%, median AQI 9) at median-AQI #7.
Annual release change
What changed in the 2025 EPA annual release
- Fairbanks North Star County's peak single-day AQI fell from 325 to 190 between the 2024 and 2025 EPA annual releases, a change of -135 points.
- Fairbanks North Star County's Unhealthy-category days rose from 8 to 10 between the 2024 and 2025 EPA annual releases, a change of +2 days.
- Fairbanks North Star County's Good-day share fell from 58.2% to 56.4% between the 2024 and 2025 EPA annual releases, a change of -1.8 percentage points.
Data updated August 2026
- Good · 206 d · 56.4%
- Moderate · 139 d · 38.1%
- USG · 10 d · 2.7%
- Unhealthy · 10 d · 2.7%
How did Fairbanks North Star County's air break down in 2025?
Across 365 monitored days, 206 fell in the Good band (AQI 0–50) and 10 reached Unhealthy or worse. The worst single day peaked at AQI 190 (Unhealthy).
EPA AQS →Share of monitored days at AQI 0-50 (Good band).
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
Where Fairbanks North Star County sits nationally
COUNT-derived placement among 951 US counties with at least 100 monitored days in 2025. Fairbanks North Star County's Good-day share is 56.4% - cleaner than 11% of that comparison set.
Fairbanks North Star County Good-day share vs. every US county
Share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release
56.4% 11th percentile higher than 11% of 951 US counties
Each bar is a band; taller bars hold more US counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2025
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Fairbanks North Star County.
- PM2.5 · 276 days · 75.6%
- Ozone · 89 days · 24.4%
2024 daily-monitor rhythm in Fairbanks North Star County
Month-by-month median AQI from EPA day-level county monitors (366 reported days in 2024). Dec posted the highest typical readings (median AQI 74, peak 170); Sep was cleanest at median 21. Summer months (Jun–Aug) averaged median AQI 34 vs 73 in Dec–Feb. 10 days crossed Unhealthy (AQI >150) at least once that year.
Five-year seasonal record
EPA day-level county files · 2020–20241,827 daily readings show a recurring local pattern: Jan has the highest matched-month median AQI (78), while Sep is lowest (25). Each cell is that month’s median daily AQI, not a current-air forecast.
Lower AQI is better. The colors summarize EPA AQI bands; gaps mean the county had no day-level record for that month.
Health Impact Assessment
Fairbanks North Star County's air quality is rated Moderate based on 56.4% good air days. There were 10 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 10 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 190. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is PM2.5, driving AQI on 276 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Fairbanks North Star County. Highest Good-day share: 2020 (63.1%, 231 of 366 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 231 | 98 | 17 | 20 | 39 | 177 |
| 2021 | 211 | 120 | 21 | 13 | 42 | 189 |
| 2022 | 213 | 105 | 18 | 27 | 43 | 310 |
| 2023 | 224 | 109 | 21 | 10 | 41 | 231 |
| 2024 | 213 | 128 | 15 | 8 | 42 | 325 |
| 2025 | 206 | 139 | 10 | 10 | 44 | 190 |
How does Fairbanks North Star County compare?
How Fairbanks North Star County compares
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 Fairbanks North Star County, Alaska · 2020–2025
Download this county's annual AQI row as CSV , with the same EPA fields and denominator shown on this page.
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.