Metro area air quality · 2025

Platteville, WI

Median AQI 37 (Good). 68.7% of monitored days rated Good across this metro's EPA monitoring network.

37
Median AQI
68.7%
Good-air days
1
Unhealthy days
42%
Cleaner than US metros

Platteville, WI posted a 2025 median AQI of 37 (Good) with 68.7% Good days

According to the U.S. EPA Air Quality System, the Platteville, WI CBSA recorded a median AQI of 37 across 358 monitored days in 2025, with 68.7% 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 Platteville, WI CBSA's 68.7% Good-day share places it cleaner than 42% of US metros in 2025.
Closest median-AQI peer
Alexandria, LA (73.7% Good, median AQI 37) is the closest nationwide median-AQI peer to Platteville, WI.
2020–2025 Good-day shift
Platteville, WI's Good-day share moved +4.0 points from 2020 to 2025 (median AQI -3).
Median AQI
Median AQI: 37

Aggregated from EPA Air Quality System (2025), 358 monitored days. EPA AQS →

The verdict

Platteville, WI's median AQI 37 is in the lower (cleaner) CBSA tercile on this site. On the EPA scale the metro runs good, more polluted than the median US metro, with a median AQI of 37 and 68.7% of 358 monitored days in the Good band.

37
median AQI · Good
68.7%
days rated Good
42%
cleaner than US metros
167
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

2024 → 2025
  • Platteville, WI metro's peak single-day AQI rose from 82 to 167 between the 2024 and 2025 EPA annual releases, a change of +85 points.
  • Platteville, WI metro's Good-day share fell from 71.9% to 69.1% between the 2024 and 2025 EPA annual releases, a change of -2.8 percentage points.
  • Platteville, WI metro's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.

Compared against 366 monitored days in 2024 and 356 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Platteville, WI's median AQI 37 is in the lower (cleaner) CBSA tercile on this site. Signature read: median AQI 37 (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 37 over 358 measured days in 2025 (Good / Moderate). The monitored-day split lands at 246 Good (69%), 109 Moderate (30%), and 2 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 63; the highest single-day reading hit 167 (Unhealthy).

Across 2020–2025, Good-day share shifted +4.0 points and median AQI moved -3 (improving). The annual record contains 1 day at Unhealthy or worse. Metros with comparable AQI profiles include Alexandria, LA (73.7% good, AQI 37); Athens, TN (78.2% good, AQI 37); Bennington, VT (83.6% good, AQI 37).

Health effects of air pollution →

Air Quality Summary

Median AQI

37

Good

Good Days

68.7%

246 of 358 days

Max AQI

167

Unhealthy

Health Grade

Moderate

90th pct: 63

AQI Day Breakdown (2025)

Distribution of 358 monitored days across EPA AQI categories.

Good

246

69%

Moderate

109

30%

USG

2

1%

Unhealthy

1

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Platteville, WI metro area's air quality is rated Moderate based on 68.7% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.

Air quality is acceptable most days, but 2 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 167. Sensitive groups should monitor real-time conditions at AirNow.gov.

How does the Platteville, WI metro compare?

How Platteville, WI compares

Good-day share worse than typical
Platteville, WI 68.7%
Alexandria, LA 73.7%
Typical US metro 70.6%
Median AQI better than typical
Platteville, WI 37
Alexandria, LA 37
Typical US metro 41
Unhealthy days / yr about typical
Platteville, WI 1
Alexandria, LA 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Platteville, WI metro. Highest Good-day share: 2024 (71.9%, 263 of 366 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 235 126 0 40
2021 200 155 0 46
2022 241 118 0 39
2023 198 160 2 48
2024 263 103 0 36
2025 246 109 1 37

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Platteville, WI (37).

Alexandria, LA

Median AQI 37 · 73.7% Good-day share

37

Athens, TN

Median AQI 37 · 78.2% Good-day share

37

Bennington, VT

Median AQI 37 · 83.6% Good-day share

37

Blacksburg-Christiansburg-Radford, VA

Median AQI 37 · 94.4% Good-day share

37

Cadillac, MI

Median AQI 37 · 86.0% Good-day share

37

Chambersburg-Waynesboro, PA

Median AQI 37 · 91.5% Good-day share

37

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Platteville, WI's 1 (independent of median AQI).

Ann Arbor, MI

1 unhealthy-or-worse days · median AQI 41

41

Bangor, ME

1 unhealthy-or-worse days · median AQI 33

33

Baraboo, WI

1 unhealthy-or-worse days · median AQI 35

35

Bartlesville, OK

1 unhealthy-or-worse days · median AQI 44

44

Beaumont-Port Arthur, TX

1 unhealthy-or-worse days · median AQI 52

52

Beaver Dam, WI

1 unhealthy-or-worse days · median AQI 40

40

Frequently Asked Questions

What does AQI 37 mean for health? ▼
An AQI of 37 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
How many unhealthy air days does Platteville, WI have? ▼
In 2025, the Platteville, WI metro area recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 167.
What is the air quality in the Platteville, WI metro area? ▼
The Platteville, WI metro area has a median Air Quality Index (AQI) of 37, rated "Good." 68.7% of monitored days (246 out of 358) had good air quality in 2025.
Is air quality in Platteville, WI getting better or worse? ▼
Air quality in the Platteville, WI metro is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 71.9% (263 of 366 days). Lowest qualifying Good-day share: 2023 at 55.0% (198 of 360 days).
How does Platteville, WI compare to other metro areas? ▼
The Platteville, WI metro has 68.7% good air days. Similar metros: Alexandria, LA (73.7% good), Athens, TN (78.2% good), Bennington, VT (83.6% good).
What is the 90th percentile AQI for Platteville, WI? ▼
The 90th percentile AQI for the Platteville, WI metro area is 63, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 167 (Unhealthy).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Platteville, WI, 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, Platteville, WI · 2020–2025