Median AQI
39
Good
Wisconsin · County air quality · 2025
Dodge County, Wisconsin
Median AQI 39 (Good). 76.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 39
- Median AQI
- 76.4%
- Good-air days
- 0
- Unhealthy days
- 42%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Dodge County's air is good on balance, more polluted than the median US county, a median AQI of 39 with 76.4% of 182 monitored days in the Good band, driven mainly by Ozone.
- 39
- median AQI · Good
- 76.4%
- days rated Good
- Ozone
- main pollutant
- 42%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 137.
Data updated July 2026
- Good · 139 d · 76.4%
- Moderate · 42 d · 23.1%
- USG · 1 d · 0.5%
How did Dodge County's air break down in 2025?
Across 182 monitored days, 139 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 137 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 182 days monitored. Median AQI: 39 (Good).
Insights: Dodge County, Wisconsin. EPA monitors recorded a median Air Quality Index of 39 across 182 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 139 (76%) fell in the Good band (AQI 0–50), 42 (23%) registered Moderate readings, and 1 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 61, while the worst single-day peak hit 137 (USG). Residents averaged about 22.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (134 days), PM2.5 (46 days), PM10 (1 days), CO (1 days). Across the 2020–2025 trend window, good days shifted by -108 and the median AQI moved -3 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 137, usg but never Unhealthy. 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); Door (85.7% good, AQI 40); Eau Claire (77.9% good, AQI 38).
Air Quality Summary
Good Days
76.4%
139 of 182 monitored days
1.4pp vs 75% target
Max AQI Recorded
137
USG
Health Grade
Good
90th-pct AQI 61
Dodge County, Good days share 76.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Dodge County, Unhealthy-or-worse share 0.0%
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 182 monitored days across EPA AQI categories.
Good
139
76%
Moderate
42
23%
USG
1
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Dodge County.
- Ozone · 134 days · 73.6%
- PM2.5 · 46 days · 25.3%
- PM10 · 1 days · 0.5%
- CO · 1 days · 0.5%
Health Impact Assessment
Good
Dodge County's air quality is rated Good based on 76.4% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 76.4% of monitored days in 2025, with a median AQI of 39. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 134 of 182 monitored days.
5-Year Air Quality Trend
Air quality is improving in Dodge County. Best year: 2024 (297 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 247 | 117 | 2 | 0 | 42 | 136 |
| 2021 | 216 | 149 | 0 | 0 | 46 | 99 |
| 2022 | 266 | 99 | 0 | 0 | 42 | 93 |
| 2023 | 213 | 133 | 14 | 2 | 46 | 210 |
| 2024 | 297 | 69 | 0 | 0 | 38 | 84 |
| 2025 | 139 | 42 | 1 | 0 | 39 | 137 |
How does Dodge County compare?
How Dodge County compares
Good-day share about average
Dodge County 76.4%
Ashland County, Wisconsin 85.6%
US average 76.5%
Median AQI worse than US avg
Dodge County 39
Ashland County, Wisconsin 39
US average 38
Unhealthy days / yr about average
Dodge County 0
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 Dodge County.
Ada County, Idaho
AQI 39 · 80.6% good
Aiken County, South Carolina
AQI 39 · 89.1% good
Albany County, New York
AQI 39 · 67.4% good
Alexander County, North Carolina
AQI 39 · 92.4% good
Ashland County, Wisconsin
AQI 39 · 85.6% good
Bennington County, Vermont
AQI 39 · 82.9% good
What Dodge County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 39 means for exposure. Health guidance
- See how Dodge County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Dodge County with its Wisconsin neighbours before drawing a conclusion about the region. All of Wisconsin
Based on 182 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 Dodge County, Wisconsin? ▼
Dodge County has a median Air Quality Index (AQI) of 39, rated "Good." 76.4% of monitored days (139 out of 182) had good air quality in 2025.
What is the main pollutant in Dodge County? ▼
The primary pollutant in Dodge County is Ozone (O3), which was the main AQI driver on 134 days (74% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Dodge County have? ▼
In 2025, Dodge County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 137.
Is the air quality in Dodge County getting better or worse? ▼
Air quality in Dodge County is improving based on 5-year trends (2020-2025). Best year: 2024 with 297 good days. Worst year: 2025 with 139 good days.
What does AQI 39 mean for health? ▼
Dodge County's median AQI of 39 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 Dodge County compare to other counties in Wisconsin? ▼
Dodge County has 76.4% good air days. Nearby counties in Wisconsin: Ashland (85.6% good), Brown (79.0% good), Columbia (84.6% good), Dane (71.8% good), Door (85.7% good), Eau Claire (77.9% good).
What is the 90th percentile AQI in Dodge County? ▼
The 90th percentile AQI for Dodge County is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 137 (USG).
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.