Metro area air quality · 2025
Juneau, AK
Median AQI 21 (Good). 85.1% of monitored days rated Good across this metro's EPA monitoring network.
- 21
- Median AQI
- 85.1%
- Good-air days
- 0
- Unhealthy days
- 76%
- Cleaner than US metros
Aggregated from EPA Air Quality System (2025), 181 monitored days. EPA AQS →
The verdict
The Juneau, AK metro runs good on the EPA scale, cleaner than most US metros, a median AQI of 21 with 85.1% of 181 monitored days in the Good band.
- 21
- median AQI · Good
- 85.1%
- days rated Good
- 76%
- cleaner than US metros
- 138
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Insights: Juneau, AK metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 21 over 181 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 154 Good days (85%), 26 Moderate (14%), and 1 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 57 while the highest single-day reading hit 138 (USG). Metro residents averaged roughly 25.5 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, good days shifted by -166 and the median AQI moved +2 points, which classifies the multi-year trajectory as worsening. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Bremerton-Silverdale, WA (96.2% good, AQI 21); Longview, WA (91.6% good, AQI 21); Palatka, FL (96.0% good, AQI 21).
Air Quality Summary
Median AQI
21
Good
Good Days
85.1%
154 of 181 days
Max AQI
138
USG
Health Grade
Good
90th pct: 57
AQI Day Breakdown (2025)
Distribution of 181 monitored days across EPA AQI categories.
Good
154
85%
Moderate
26
14%
USG
1
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Juneau, AK metro area's air quality is rated Good based on 85.1% good air days. No unhealthy air days were recorded in 2025.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the Juneau, AK metro compare?
How Juneau, AK compares
5-Year Air Quality Trend
Air quality is worsening in the Juneau, AK metro. Best year: 2020 (320 good days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 320 | 40 | 0 | 19 | 101 |
| 2021 | 315 | 42 | 0 | 20 | 89 |
| 2022 | 291 | 51 | 0 | 21 | 95 |
| 2023 | 314 | 50 | 0 | 24 | 78 |
| 2024 | 304 | 52 | 0 | 24 | 84 |
| 2025 | 154 | 26 | 0 | 21 | 138 |
Metros with Similar Air Quality
Metro areas across the US with a similar median AQI to Juneau, AK.
More Air Quality Data
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Worst Air Quality
Counties and metros with the most unhealthy air days.
All Metro Areas
Annual AQI by CBSA for every monitored U.S. metro area.
Best and Worst City Air
What drives urban air quality and how metro areas compare.
Air Quality Guides
Frequently Asked Questions
What is the air quality in the Juneau, AK metro area? ▼
How many unhealthy air days does Juneau, AK have? ▼
Is air quality in Juneau, AK getting better or worse? ▼
What does AQI 21 mean for health? ▼
What is the 90th percentile AQI for Juneau, AK? ▼
How does Juneau, AK compare to other metro areas? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. See our methodology for how AQI, median, and coverage figures are computed.
Read our methodology , how this data is sourced, computed, and verified.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary files (metro-level) · 2020–2025
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.