Metro area air quality · 2025
Sioux City, IA-NE-SD
Median AQI 39 (Good). 79.6% of monitored days rated Good across this metro's EPA monitoring network.
- 39
- Median AQI
- 79.6%
- Good-air days
- 0
- Unhealthy days
- 67%
- Cleaner than US metros
Sioux City, IA-NE-SD posted a 2025 median AQI of 39 (Good) with 79.6% Good days
According to the U.S. EPA Air Quality System, the Sioux City, IA-NE-SD CBSA recorded a median AQI of 39 across 284 monitored days in 2025, with 79.6% 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 Sioux City, IA-NE-SD CBSA's 79.6% Good-day share places it cleaner than 67% of US metros in 2025.
- Closest median-AQI peer
- Bay City, MI (70.4% Good, median AQI 39) is the closest nationwide median-AQI peer to Sioux City, IA-NE-SD.
- 2020–2025 Good-day shift
- Sioux City, IA-NE-SD's Good-day share moved +0.7 points from 2020 to 2025 (median AQI +0).
- Median AQI
- Median AQI: 39
Aggregated from EPA Air Quality System (2025), 284 monitored days. EPA AQS →
The verdict
The Sioux City, IA-NE-SD metro runs good on the EPA scale, cleaner than the median US metro, a median AQI of 39 with 79.6% of 284 monitored days in the Good band.
- 39
- median AQI · Good
- 79.6%
- days rated Good
- 67%
- cleaner than US metros
- 122
- 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
- Sioux City, IA-NE-SD metro's peak single-day AQI rose from 93 to 122 between the 2024 and 2025 EPA annual releases, a change of +29 points.
- Sioux City, IA-NE-SD metro's Good-day share rose from 78.9% to 80.4% between the 2024 and 2025 EPA annual releases, a change of +1.6 percentage points.
- Sioux City, IA-NE-SD metro's median AQI fell from 43 to 39 between the 2024 and 2025 EPA annual releases, a change of -4 points.
Insights: Sioux City, IA-NE-SD metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 39 over 284 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 226 Good days (80%), 55 Moderate (19%), and 3 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 61 while the highest single-day reading hit 122 (USG). Metro residents averaged roughly 23.9 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +0.7 points (measured against 365 monitored days in 2020 and 281 in 2025, so raw day counts are not comparable) and the median AQI moved +0 points, which classifies the multi-year trajectory as stable. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Bay City, MI (70.4% good, AQI 39); Brainerd, MN (74.3% good, AQI 39); Cambridge, MD (86.0% good, AQI 39).
Air Quality Summary
Median AQI
39
Good
Good Days
79.6%
226 of 284 days
Max AQI
122
USG
Health Grade
Good
90th pct: 61
AQI Day Breakdown (2025)
Distribution of 284 monitored days across EPA AQI categories.
Good
226
80%
Moderate
55
19%
USG
3
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Sioux City, IA-NE-SD metro area's air quality is rated Good based on 79.6% 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 Sioux City, IA-NE-SD metro compare?
How Sioux City, IA-NE-SD compares
5-Year Air Quality Trend
Air quality is stable in the Sioux City, IA-NE-SD metro. Best year: 2020 (291 good days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 291 | 74 | 0 | 39 | 141 |
| 2021 | 194 | 105 | 2 | 45 | 168 |
| 2022 | 91 | 22 | 0 | 36 | 76 |
| 2023 | 71 | 45 | 2 | 43 | 169 |
| 2024 | 224 | 60 | 0 | 43 | 93 |
| 2025 | 226 | 55 | 0 | 39 | 122 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Sioux City, IA-NE-SD (39).
Bay City, MI
Median AQI 39 · 70.4% Good-day share
Brainerd, MN
Median AQI 39 · 74.3% Good-day share
Cambridge, MD
Median AQI 39 · 86.0% Good-day share
Charleston, WV
Median AQI 39 · 77.0% Good-day share
Dalton, GA
Median AQI 39 · 90.3% Good-day share
Harrisonburg, VA
Median AQI 39 · 80.0% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Sioux City, IA-NE-SD's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
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, OR
0 unhealthy-or-worse days · median AQI 27
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 Sioux City, IA-NE-SD metro area? ▼
How many unhealthy air days does Sioux City, IA-NE-SD have? ▼
Is air quality in Sioux City, IA-NE-SD getting better or worse? ▼
What does AQI 39 mean for health? ▼
What is the 90th percentile AQI for Sioux City, IA-NE-SD? ▼
How does Sioux City, IA-NE-SD 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
Share this annual record
Send the source-year summary or download its ready-to-use data card.
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.