Metro area air quality · 2025
La Crosse-Onalaska, WI-MN
Median AQI 37 (Good). 93.4% of monitored days rated Good across this metro's EPA monitoring network.
- 37
- Median AQI
- 93.4%
- Good-air days
- 0
- Unhealthy days
- 92%
- Cleaner than US metros
La Crosse-Onalaska, WI-MN posted a 2025 median AQI of 37 (Good) with 93.4% Good days
According to the U.S. EPA Air Quality System, the La Crosse-Onalaska, WI-MN CBSA recorded a median AQI of 37 across 198 monitored days in 2025, with 93.4% rated Good and 0 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 La Crosse-Onalaska, WI-MN CBSA's 93.4% Good-day share places it cleaner than 92% 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 La Crosse-Onalaska, WI-MN.
- 2020–2025 Good-day shift
- La Crosse-Onalaska, WI-MN's Good-day share moved +23.4 points from 2020 to 2025 (median AQI -5).
- Median AQI
- Median AQI: 37
Aggregated from EPA Air Quality System (2025), 198 monitored days. EPA AQS →
The verdict
La Crosse-Onalaska, WI-MN sits in the upper Good-day tercile among EPA CBSA metros on this site (93.4% of 198 monitored days). On the EPA scale the metro runs good, among the cleanest 10% of US metros, with a median AQI of 37 and 93.4% of 198 monitored days in the Good band.
- 37
- median AQI · Good
- 93.4%
- days rated Good
- 92%
- cleaner than US metros
- 90
- worst single reading
No day crossed into the Unhealthy tier across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- La Crosse-Onalaska, WI-MN metro's Good-day share fell from 96.1% to 93.4% between the 2024 and 2025 EPA annual releases, a change of -2.7 percentage points.
- La Crosse-Onalaska, WI-MN metro's peak single-day AQI rose from 67 to 90 between the 2024 and 2025 EPA annual releases, a change of +23 points.
La Crosse-Onalaska, WI-MN sits in the upper Good-day tercile among EPA CBSA metros on this site (93.4% of 198 monitored days). Signature read: 93.4% Good-day share (high tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 37 over 198 measured days in 2025 (Good / Excellent). The monitored-day split lands at 185 Good (93%), 13 Moderate (7%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 49; the highest single-day reading hit 90 (Moderate).
Across 2020–2025, Good-day share shifted +23.4 points and median AQI moved -5 (improving). No Unhealthy-tier days appear in this annual dataset. 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).
Air Quality Summary
Median AQI
37
Good
Good Days
93.4%
185 of 198 days
Max AQI
90
Moderate
Health Grade
Excellent
90th pct: 49
AQI Day Breakdown (2025)
Distribution of 198 monitored days across EPA AQI categories.
Good
185
93%
Moderate
13
7%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The La Crosse-Onalaska, WI-MN metro area's air quality is rated Excellent based on 93.4% good air days. No unhealthy air days were recorded in 2025.
Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.
How does the La Crosse-Onalaska, WI-MN metro compare?
How La Crosse-Onalaska, WI-MN compares
5-Year Air Quality Trend
Air quality is improving in the La Crosse-Onalaska, WI-MN metro. Highest Good-day share: 2024 (96.1%, 197 of 205 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 255 | 109 | 0 | 42 | 93 |
| 2021 | 240 | 124 | 0 | 43 | 110 |
| 2022 | 271 | 94 | 0 | 41 | 85 |
| 2023 | 199 | 130 | 5 | 45 | 181 |
| 2024 | 197 | 8 | 0 | 37 | 67 |
| 2025 | 185 | 13 | 0 | 37 | 90 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near La Crosse-Onalaska, WI-MN (37).
Alexandria, LA
Median AQI 37 · 73.7% Good-day share
Athens, TN
Median AQI 37 · 78.2% Good-day share
Bennington, VT
Median AQI 37 · 83.6% Good-day share
Blacksburg-Christiansburg-Radford, VA
Median AQI 37 · 94.4% Good-day share
Cadillac, MI
Median AQI 37 · 86.0% Good-day share
Chambersburg-Waynesboro, PA
Median AQI 37 · 91.5% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to La Crosse-Onalaska, WI-MN's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Frequently Asked Questions
How many unhealthy air days does La Crosse-Onalaska, WI-MN have? ▼
What is the air quality in the La Crosse-Onalaska, WI-MN metro area? ▼
Is air quality in La Crosse-Onalaska, WI-MN getting better or worse? ▼
What does AQI 37 mean for health? ▼
How does La Crosse-Onalaska, WI-MN compare to other metro areas? ▼
What is the 90th percentile AQI for La Crosse-Onalaska, WI-MN? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for La Crosse-Onalaska, WI-MN, 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, La Crosse-Onalaska, WI-MN · 2020–2025