Metro area air quality · 2024

Fond du Lac, WI

Median AQI 38 (Good). 92.7% of monitored days rated Good across this metro's EPA monitoring network.

38
Median AQI
92.7%
Good-air days
0
Unhealthy days
89%
Cleaner than US metros

Aggregated from EPA Air Quality System (2024), 205 monitored days. EPA AQS → · NOAA →

Insights: Fond du Lac, WI metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 38 over 205 measured days in 2024, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 190 Good days (93%), 15 Moderate (7%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 49 while the highest single-day reading hit 77 (Moderate). Metro residents averaged roughly 27.8 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by -4 and the median AQI moved +2 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 Americus, GA (93.4% good, AQI 38); Beaver Dam, WI (81.2% good, AQI 38); Blacksburg-Christiansburg-Radford, VA (91.9% good, AQI 38).

Air Quality Summary

Median AQI

38

Good

Good Days

92.7%

190 of 205 days

Max AQI

77

Moderate

Health Grade

Excellent

90th pct: 49

AQI Day Breakdown (2024)

Distribution of 205 monitored days across EPA AQI categories.

Good

190

93%

Moderate

15

7%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Fond du Lac, WI metro area's air quality is rated Excellent based on 92.7% good air days. No unhealthy air days were recorded in 2024.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

How does the Fond du Lac, WI metro compare?

How Fond du Lac, WI compares

Good-day share better than US avg
Fond du Lac, WI 92.7%
Americus, GA 93.4%
US average 70.2%
Median AQI better than US avg
Fond du Lac, WI 38
Americus, GA 38
US average 41
Unhealthy days / yr better than US avg
Fond du Lac, WI 0
Americus, GA 0
US average 1

5-Year Air Quality Trend

Air quality is stable in the Fond du Lac, WI metro. Best year: 2020 (194 good days).

Year Good Moderate Unhealthy Median AQI
2020 194 9 0 36
2021 178 30 0 39
2022 193 9 0 36
2023 162 38 0 41
2024 190 15 0 38

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Fond du Lac, WI.

Americus, GA

AQI 38 · 93.4% good

38

Beaver Dam, WI

AQI 38 · 81.2% good

38

Blacksburg-Christiansburg-Radford, VA

AQI 38 · 91.9% good

38

Brainerd, MN

AQI 38 · 79.5% good

38

Dickinson, ND

AQI 38 · 82.8% good

38

Eau Claire, WI

AQI 38 · 81.7% good

38

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Frequently Asked Questions

What is the air quality in the Fond du Lac, WI metro area? ▼
The Fond du Lac, WI metro area has a median Air Quality Index (AQI) of 38, rated "Good." 92.7% of monitored days (190 out of 205) had good air quality in 2024.
How many unhealthy air days does Fond du Lac, WI have? ▼
In 2024, the Fond du Lac, WI metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 77.
Is air quality in Fond du Lac, WI getting better or worse? ▼
Air quality in the Fond du Lac, WI metro is stable based on 5-year trends (2020-2024). Best year: 2020 with 194 good days. Worst year: 2023 with 162 good days.
What does AQI 38 mean for health? ▼
An AQI of 38 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 Fond du Lac, WI? ▼
The 90th percentile AQI for the Fond du Lac, WI metro area is 49, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 77 (Moderate).
How does Fond du Lac, WI compare to other metro areas? ▼
The Fond du Lac, WI metro has 92.7% good air days. Similar metros: Americus, GA (93.4% good), Beaver Dam, WI (81.2% good), Blacksburg-Christiansburg-Radford, VA (91.9% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2024. The AQS collects ambient air monitoring data from state, local, and tribal monitoring agencies across the United States.

Metrics: Air Quality Index (AQI) is calculated using EPA-standard breakpoints for six criteria pollutants: PM2.5, PM10, Ozone, NO2, CO, and SO2. Median AQI, max AQI, and 90th percentile AQI are computed from daily measurements. Good days percentage reflects days with AQI 0–50.

Coverage: 501 metro areas (Core Based Statistical Areas). Only metros with active monitoring stations are included. Unmonitored areas are not represented.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA, AirNow / AQS Air Quality Index readings and pollutant concentrations · 2025