Metro area air quality · 2025
Sheboygan, WI
Median AQI 41 (Good). 78.9% of monitored days rated Good across this metro's EPA monitoring network.
- 41
- Median AQI
- 78.9%
- Good-air days
- 1
- Unhealthy days
- 65%
- Cleaner than US metros
Sheboygan, WI posted a 2025 median AQI of 41 (Good) with 78.9% Good days
According to the U.S. EPA Air Quality System, the Sheboygan, WI CBSA recorded a median AQI of 41 across 199 monitored days in 2025, with 78.9% rated Good and 1 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 Sheboygan, WI CBSA's 78.9% Good-day share places it cleaner than 65% of US metros in 2025.
- Closest median-AQI peer
- Adrian, MI (69.3% Good, median AQI 41) is the closest nationwide median-AQI peer to Sheboygan, WI.
- 2020–2025 Good-day shift
- Sheboygan, WI's Good-day share moved -2.4 points from 2020 to 2025 (median AQI +2).
- Median AQI
- Median AQI: 41
Aggregated from EPA Air Quality System (2025), 199 monitored days. EPA AQS →
The verdict
The Sheboygan, WI metro runs good on the EPA scale, cleaner than the median US metro, a median AQI of 41 with 78.9% of 199 monitored days in the Good band.
- 41
- median AQI · Good
- 78.9%
- days rated Good
- 65%
- cleaner than US metros
- 156
- worst single reading
1 day reached Unhealthy or worse across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- Sheboygan, WI metro's Good-day share fell from 83.8% to 81.3% between the 2024 and 2025 EPA annual releases, a change of -2.5 percentage points.
- Sheboygan, WI metro's Unhealthy-category days fell from 2 to 1 between the 2024 and 2025 EPA annual releases, a change of -1 days.
- Sheboygan, WI metro's peak single-day AQI fell from 166 to 156 between the 2024 and 2025 EPA annual releases, a change of -10 points.
Insights: Sheboygan, WI metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 41 over 199 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 157 Good days (79%), 35 Moderate (18%), and 6 Unhealthy-for-Sensitive-Groups (3%). The 90th-percentile AQI finished at 77 while the highest single-day reading hit 156 (Unhealthy). Metro residents averaged roughly 23.7 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 -2.4 points and the median AQI moved +2 points, which classifies the multi-year trajectory as stable. The annual record contains 1 day at Unhealthy or worse. On that day, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Metros with comparable AQI profiles include Adrian, MI (69.3% good, AQI 41); Albany-Schenectady-Troy, NY (67.7% good, AQI 41); Ann Arbor, MI (69.3% good, AQI 41).
Air Quality Summary
Median AQI
41
Good
Good Days
78.9%
157 of 199 days
Max AQI
156
Unhealthy
Health Grade
Good
90th pct: 77
AQI Day Breakdown (2025)
Distribution of 199 monitored days across EPA AQI categories.
Good
157
79%
Moderate
35
18%
USG
6
3%
Unhealthy
1
1%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The Sheboygan, WI metro area's air quality is rated Good based on 78.9% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 6 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 156. Sensitive groups should monitor real-time conditions at AirNow.gov.
How does the Sheboygan, WI metro compare?
How Sheboygan, WI compares
5-Year Air Quality Trend
Air quality is stable in the Sheboygan, WI metro. Highest Good-day share: 2022 (87.3%, 172 of 197 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 170 | 31 | 2 | 39 | 159 |
| 2021 | 164 | 39 | 0 | 41 | 126 |
| 2022 | 172 | 24 | 1 | 40 | 177 |
| 2023 | 132 | 53 | 1 | 45 | 207 |
| 2024 | 166 | 30 | 2 | 40 | 166 |
| 2025 | 157 | 35 | 1 | 41 | 156 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near Sheboygan, WI (41).
Adrian, MI
Median AQI 41 · 69.3% Good-day share
Albany-Schenectady-Troy, NY
Median AQI 41 · 67.7% Good-day share
Ann Arbor, MI
Median AQI 41 · 69.3% Good-day share
Bowling Green, KY
Median AQI 41 · 75.6% Good-day share
Brunswick, GA
Median AQI 41 · 74.3% Good-day share
Decatur, AL
Median AQI 41 · 78.4% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to Sheboygan, WI's 1 (independent of median AQI).
Bangor, ME
1 unhealthy-or-worse days · median AQI 33
Baraboo, WI
1 unhealthy-or-worse days · median AQI 35
Bartlesville, OK
1 unhealthy-or-worse days · median AQI 44
Beaumont-Port Arthur, TX
1 unhealthy-or-worse days · median AQI 52
Beaver Dam, WI
1 unhealthy-or-worse days · median AQI 40
Bellingham, WA
1 unhealthy-or-worse days · median AQI 31
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 Sheboygan, WI metro area? ▼
How many unhealthy air days does Sheboygan, WI have? ▼
Is air quality in Sheboygan, WI getting better or worse? ▼
What does AQI 41 mean for health? ▼
What is the 90th percentile AQI for Sheboygan, WI? ▼
How does Sheboygan, WI 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
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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.