Metro area air quality · 2024

Beaver Dam, WI

Median AQI 38 (Good). 81.2% of monitored days rated Good across this metro's EPA monitoring network.

38
Median AQI
81.2%
Good-air days
0
Unhealthy days
69%
Cleaner than US metros

Aggregated from EPA Air Quality System (2024), 366 monitored days. EPA AQS → · NOAA →

Insights: Beaver Dam, WI metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 38 over 366 measured days in 2024, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 297 Good days (81%), 69 Moderate (19%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 54 while the highest single-day reading hit 84 (Moderate). Metro residents averaged roughly 24.3 clean-air days per 30-day window across the reporting year.

Across the 2020–2024 trend window, good days shifted by +50 and the median AQI moved -4 points, which classifies the multi-year trajectory as improving. 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); Blacksburg-Christiansburg-Radford, VA (91.9% good, AQI 38); Brainerd, MN (79.5% good, AQI 38).

Air Quality Summary

Median AQI

38

Good

Good Days

81.2%

297 of 366 days

Max AQI

84

Moderate

Health Grade

Good

90th pct: 54

AQI Day Breakdown (2024)

Distribution of 366 monitored days across EPA AQI categories.

Good

297

81%

Moderate

69

19%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Beaver Dam, WI metro area's air quality is rated Good based on 81.2% 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 Beaver Dam, WI metro compare?

How Beaver Dam, WI compares

Good-day share better than US avg
Beaver Dam, WI 81.2%
Americus, GA 93.4%
US average 70.2%
Median AQI better than US avg
Beaver Dam, WI 38
Americus, GA 38
US average 41
Unhealthy days / yr better than US avg
Beaver Dam, WI 0
Americus, GA 0
US average 1

5-Year Air Quality Trend

Air quality is improving in the Beaver Dam, WI metro. Best year: 2024 (297 good days).

Year Good Moderate Unhealthy Median AQI
2020 247 117 0 42
2021 216 149 0 46
2022 266 99 0 42
2023 213 133 2 46
2024 297 69 0 38

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Beaver Dam, WI.

Americus, GA

AQI 38 · 93.4% 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

Erie, PA

AQI 38 · 80.6% good

38

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Frequently Asked Questions

What is the air quality in the Beaver Dam, WI metro area? ▼
The Beaver Dam, WI metro area has a median Air Quality Index (AQI) of 38, rated "Good." 81.2% of monitored days (297 out of 366) had good air quality in 2024.
How many unhealthy air days does Beaver Dam, WI have? ▼
In 2024, the Beaver Dam, WI metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 84.
Is air quality in Beaver Dam, WI getting better or worse? ▼
Air quality in the Beaver Dam, WI metro is improving based on 5-year trends (2020-2024). Best year: 2024 with 297 good days. Worst year: 2023 with 213 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 Beaver Dam, WI? ▼
The 90th percentile AQI for the Beaver Dam, WI metro area is 54, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 84 (Moderate).
How does Beaver Dam, WI compare to other metro areas? ▼
The Beaver Dam, WI metro has 81.2% good air days. Similar metros: Americus, GA (93.4% good), Blacksburg-Christiansburg-Radford, VA (91.9% good), Brainerd, MN (79.5% 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