Median AQI
38
Good
Wisconsin · County air quality · 2025
Outagamie County, Wisconsin
Median AQI 38 (Good). 78.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 38
- Median AQI
- 78.5%
- Good-air days
- 1
- Unhealthy days
- 47%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Outagamie County's air is good on balance, more polluted than the median US county, a median AQI of 38 with 78.5% of 181 monitored days in the Good band, driven mainly by PM2.5.
- 38
- median AQI · Good
- 78.5%
- days rated Good
- PM2.5
- main pollutant
- 47%
- cleaner than US counties
1 day reached Unhealthy or worse; the worst single reading hit AQI 152.
Data updated July 2026
- Good · 142 d · 78.5%
- Moderate · 38 d · 21.0%
- Unhealthy · 1 d · 0.6%
How did Outagamie County's air break down in 2025?
Across 181 monitored days, 142 fell in the Good band (AQI 0–50) and 1 reached Unhealthy or worse. The worst single day peaked at AQI 152 (Unhealthy).
EPA AQS →Air quality data from EPA Air Quality System (2025). 181 days monitored. Median AQI: 38 (Good).
Insights: Outagamie County, Wisconsin. EPA monitors recorded a median Air Quality Index of 38 across 181 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 142 (78%) fell in the Good band (AQI 0–50), 38 (21%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 58, while the worst single-day peak hit 152 (Unhealthy). Residents averaged about 23.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (121 days), Ozone (60 days). Across the 2020–2025 trend window, good days shifted by -112 and the median AQI moved -2 points, placing the multi-year trajectory at improving. Residents and visitors experienced 1 unhealthy-or-worse days combined, periods when the EPA recommends sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Ashland (85.6% good, AQI 39); Brown (79.0% good, AQI 37); Columbia (84.6% good, AQI 42); Dane (71.8% good, AQI 40); Dodge (76.4% good, AQI 39); Door (85.7% good, AQI 40).
Air Quality Summary
Good Days
78.5%
142 of 181 monitored days
3.5pp vs 75% target
Max AQI Recorded
152
Unhealthy
Health Grade
Good
90th-pct AQI 58
Outagamie County, Good days share 78.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Outagamie County, Unhealthy-or-worse share 0.6%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 181 monitored days across EPA AQI categories.
Good
142
78%
Moderate
38
21%
USG
0
0%
Unhealthy
1
1%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Outagamie County.
- PM2.5 · 121 days · 66.9%
- Ozone · 60 days · 33.1%
Health Impact Assessment
Good
Outagamie County's air quality is rated Good based on 78.5% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 0 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 152. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is PM2.5, driving AQI on 121 of 181 monitored days.
5-Year Air Quality Trend
Air quality is improving in Outagamie County. Best year: 2024 (291 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 254 | 110 | 2 | 0 | 40 | 126 |
| 2021 | 226 | 134 | 3 | 0 | 44 | 139 |
| 2022 | 241 | 123 | 1 | 0 | 43 | 122 |
| 2023 | 195 | 152 | 8 | 5 | 48 | 186 |
| 2024 | 291 | 75 | 0 | 0 | 37 | 99 |
| 2025 | 142 | 38 | 0 | 1 | 38 | 152 |
How does Outagamie County compare?
How Outagamie County compares
Good-day share better than US avg
Outagamie County 78.5%
Ashland County, Wisconsin 85.6%
US average 76.5%
Median AQI about average
Outagamie County 38
Ashland County, Wisconsin 39
US average 38
Unhealthy days / yr worse than US avg
Outagamie County 1
Ashland County, Wisconsin 1
US average 0
Other Counties in Wisconsin
Air quality comparison for nearby counties in Wisconsin.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Outagamie County.
Adams County, Illinois
AQI 38 · 94.4% good
Anoka County, Minnesota
AQI 38 · 82.1% good
Atlantic County, New Jersey
AQI 38 · 79.6% good
Avery County, North Carolina
AQI 38 · 93.9% good
Barnstable County, Massachusetts
AQI 38 · 92.5% good
Bay County, Michigan
AQI 38 · 71.8% good
What Outagamie County's air means for you
On most days the air here is fine, but PM2.5 drives 1 unhealthy-or-worse day a year that sensitive groups should plan around.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 38 means for exposure. Health guidance
- See how Outagamie County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Outagamie County with its Wisconsin neighbours before drawing a conclusion about the region. All of Wisconsin
Based on 181 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Outagamie County, Wisconsin? ▼
Outagamie County has a median Air Quality Index (AQI) of 38, rated "Good." 78.5% of monitored days (142 out of 181) had good air quality in 2025.
What is the main pollutant in Outagamie County? ▼
The primary pollutant in Outagamie County is Fine Particles (PM2.5), which was the main AQI driver on 121 days (67% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Outagamie County have? ▼
In 2025, Outagamie County recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 152.
Is the air quality in Outagamie County getting better or worse? ▼
Air quality in Outagamie County is improving based on 5-year trends (2020-2025). Best year: 2024 with 291 good days. Worst year: 2025 with 142 good days.
What does AQI 38 mean for health? ▼
Outagamie County's median AQI of 38 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Outagamie County compare to other counties in Wisconsin? ▼
Outagamie County has 78.5% good air days. Nearby counties in Wisconsin: Ashland (85.6% good), Brown (79.0% good), Columbia (84.6% good), Dane (71.8% good), Dodge (76.4% good), Door (85.7% good).
What is the 90th percentile AQI in Outagamie County? ▼
The 90th percentile AQI for Outagamie County is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 152 (Unhealthy).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
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.