Metro area air quality · 2025

Aberdeen, SD

Median AQI 25 (Good). 87.1% of monitored days rated Good across this metro's EPA monitoring network.

25
Median AQI
87.1%
Good-air days
0
Unhealthy days
79%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 178 monitored days. EPA AQS →

The verdict

The Aberdeen, SD metro runs good on the EPA scale, cleaner than most US metros, a median AQI of 25 with 87.1% of 178 monitored days in the Good band.

25
median AQI · Good
87.1%
days rated Good
79%
cleaner than US metros
84
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Insights: Aberdeen, SD metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 25 over 178 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 155 Good days (87%), 23 Moderate (13%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 54 while the highest single-day reading hit 84 (Moderate). Metro residents averaged roughly 26.1 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -153 and the median AQI moved -3 points, which classifies the multi-year trajectory as stable. 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 Anchorage, AK (78.6% good, AQI 25); Cañon City, CO (91.1% good, AQI 25); Lubbock, TX (89.9% good, AQI 25).

Air Quality Summary

Median AQI

25

Good

Good Days

87.1%

155 of 178 days

Max AQI

84

Moderate

Health Grade

Good

90th pct: 54

AQI Day Breakdown (2025)

Distribution of 178 monitored days across EPA AQI categories.

Good

155

87%

Moderate

23

13%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Aberdeen, SD metro area's air quality is rated Good based on 87.1% 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 Aberdeen, SD metro compare?

How Aberdeen, SD compares

Good-day share better than US avg
Aberdeen, SD 87.1%
Anchorage, AK 78.6%
US average 71.3%
Median AQI better than US avg
Aberdeen, SD 25
Anchorage, AK 25
US average 41
Unhealthy days / yr better than US avg
Aberdeen, SD 0
Anchorage, AK 0
US average 1

5-Year Air Quality Trend

Air quality is stable in the Aberdeen, SD metro. Best year: 2022 (325 good days).

Year Good Moderate Unhealthy Median AQI
2020 308 56 0 28
2021 301 52 2 26
2022 325 25 0 23
2023 289 68 1 29
2024 306 47 0 24
2025 155 23 0 25

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Aberdeen, SD.

Anchorage, AK

AQI 25 · 78.6% good

25

Cañon City, CO

AQI 25 · 91.1% good

25

Lubbock, TX

AQI 25 · 89.9% good

25

Albany, OR

AQI 24 · 84.5% good

24

Branson, MO

AQI 26 · 100.0% good

26

Coeur d'Alene, ID

AQI 24 · 88.4% good

24

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

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 Aberdeen, SD metro area? ▼
The Aberdeen, SD metro area has a median Air Quality Index (AQI) of 25, rated "Good." 87.1% of monitored days (155 out of 178) had good air quality in 2025.
How many unhealthy air days does Aberdeen, SD have? ▼
In 2025, the Aberdeen, SD metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 84.
Is air quality in Aberdeen, SD getting better or worse? ▼
Air quality in the Aberdeen, SD metro is stable based on 5-year trends (2020-2025). Best year: 2022 with 325 good days. Worst year: 2025 with 155 good days.
What does AQI 25 mean for health? ▼
An AQI of 25 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Aberdeen, SD? ▼
The 90th percentile AQI for the Aberdeen, SD metro area is 54, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 84 (Moderate).
How does Aberdeen, SD compare to other metro areas? ▼
The Aberdeen, SD metro has 87.1% good air days. Similar metros: Anchorage, AK (78.6% good), Cañon City, CO (91.1% good), Lubbock, TX (89.9% good).

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.