Metro area air quality · 2025
Aberdeen, SD
Median AQI 27 (Good). 83.6% of monitored days rated Good across this metro's EPA monitoring network.
- 27
- Median AQI
- 83.6%
- Good-air days
- 0
- Unhealthy days
- 75%
- Cleaner than US metros
Aberdeen, SD posted a 2025 median AQI of 27 (Good) with 83.6% Good days
According to the U.S. EPA Air Quality System, the Aberdeen, SD CBSA recorded a median AQI of 27 across 360 monitored days in 2025, with 83.6% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US metros
- The Aberdeen, SD CBSA's 83.6% Good-day share places it cleaner than 75% of US metros in 2025.
- Closest median-AQI peer
- Albany, OR (80.0% Good, median AQI 27) is the closest nationwide median-AQI peer to Aberdeen, SD.
- 2020–2025 Good-day shift
- Aberdeen, SD's Good-day share moved +0.4 points from 2020 to 2025 (median AQI -1).
- Median AQI
- Median AQI: 27
Aggregated from EPA Air Quality System (2025), 360 monitored days. EPA AQS →
The verdict
Aberdeen, SD sits in the upper Good-day tercile among EPA CBSA metros on this site (83.6% of 360 monitored days). On the EPA scale the metro runs good, cleaner than most US metros, with a median AQI of 27 and 83.6% of 360 monitored days in the Good band.
- 27
- median AQI · Good
- 83.6%
- days rated Good
- 75%
- cleaner than US metros
- 115
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Aberdeen, SD metro's Good-day share fell from 86.7% to 85.0% between the 2024 and 2025 EPA annual releases, a change of -1.7 percentage points.
- Aberdeen, SD metro's median AQI rose from 24 to 27 between the 2024 and 2025 EPA annual releases, a change of +3 points.
Aberdeen, SD sits in the upper Good-day tercile among EPA CBSA metros on this site (83.6% of 360 monitored days). Signature read: 83.6% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 27 over 360 measured days in 2025 (Good / Good). The monitored-day split lands at 301 Good (84%), 53 Moderate (15%), and 6 Unhealthy-for-Sensitive-Groups (2%). The 90th-percentile AQI finished at 56; the highest single-day reading hit 115 (USG).
Across 2020–2025, Good-day share shifted +0.4 points and median AQI moved -1 (stable). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Albany, OR (80.0% good, AQI 27); Anchorage, AK (77.5% good, AQI 27); La Grande, OR (84.4% good, AQI 27).
Air Quality Summary
Median AQI
27
Good
Good Days
83.6%
301 of 360 days
Max AQI
115
USG
Health Grade
Good
90th pct: 56
AQI Day Breakdown (2025)
Distribution of 360 monitored days across EPA AQI categories.
Good
301
84%
Moderate
53
15%
USG
6
2%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Aberdeen, SD metro area's air quality is rated Good based on 83.6% 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 Aberdeen, SD metro compare?
How Aberdeen, SD compares
5-Year Air Quality Trend
Air quality is stable in the Aberdeen, SD metro. Highest Good-day share: 2022 (92.9%, 325 of 350 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 308 | 56 | 0 | 28 | 78 |
| 2021 | 301 | 52 | 2 | 26 | 208 |
| 2022 | 325 | 25 | 0 | 23 | 93 |
| 2023 | 289 | 68 | 1 | 29 | 166 |
| 2024 | 306 | 47 | 0 | 24 | 118 |
| 2025 | 301 | 53 | 0 | 27 | 115 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Aberdeen, SD (27).
Albany, OR
Median AQI 27 · 80.0% Good-day share
Anchorage, AK
Median AQI 27 · 77.5% Good-day share
La Grande, OR
Median AQI 27 · 84.4% Good-day share
Olympia-Tumwater, WA
Median AQI 27 · 93.5% Good-day share
Sheridan, WY
Median AQI 27 · 89.1% Good-day share
Utica-Rome, NY
Median AQI 27 · 84.4% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Aberdeen, SD's 0 (independent of median AQI).
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany-Schenectady-Troy, NY
0 unhealthy-or-worse days · median AQI 41
Alexandria, LA
0 unhealthy-or-worse days · median AQI 37
Frequently Asked Questions
How many unhealthy air days does Aberdeen, SD have? ▼
What is the air quality in the Aberdeen, SD metro area? ▼
Is air quality in Aberdeen, SD getting better or worse? ▼
What does AQI 27 mean for health? ▼
How does Aberdeen, SD compare to other metro areas? ▼
What is the 90th percentile AQI for Aberdeen, SD? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Aberdeen, SD, 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, Aberdeen, SD · 2020–2025