SmogRank / Countries / United States / Wisconsin
Most polluted cities in Wisconsin, United States
10 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Oconomowoc at 7.3 µg/m³, #782 in the world.
10 good
- 1Oconomowoclow-cost sensors 7.3
- 2Waukesha 6.1
- 3Green Bay 5.6
- 4South Milwaukee 5.6
- 5Eau Claire 5.3
- 6Superior 4.9
- 7Madison 4.8
- 8Appleton 4.4
- 9Brookfieldlow-cost sensors 4.1
- 10Middletonlow-cost sensors 2.6
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
Estimated: cities without a monitor
Wisconsin cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Kenosha | ≈ 5 µg/m³ |
| Racine | ≈ 3 µg/m³ |
| Oshkosh | ≈ 5 µg/m³ |
| Janesville | ≈ 5 µg/m³ |
| West Allis | ≈ 5 µg/m³ |
| North La Crosse | ≈ 4 µg/m³ |
| Sheboygan | ≈ 4 µg/m³ |
| Wauwatosa | ≈ 5 µg/m³ |
| Fond du Lac | ≈ 5 µg/m³ |
| New Berlin | ≈ 5 µg/m³ |
| Wausau | ≈ 3 µg/m³ |
| Greenfield | ≈ 5 µg/m³ |
| Beloit | ≈ 6 µg/m³ |
| Franklin | ≈ 5 µg/m³ |
| Menomonee Falls | ≈ 5 µg/m³ |
| Oak Creek | ≈ 5 µg/m³ |
| Manitowoc | ≈ 5 µg/m³ |
| Sun Prairie | ≈ 5 µg/m³ |
| West Bend | ≈ 5 µg/m³ |
| Fitchburg | ≈ 5 µg/m³ |
| Stevens Point | ≈ 5 µg/m³ |
| Mount Pleasant | ≈ 5 µg/m³ |
| Neenah | ≈ 5 µg/m³ |
| Muskego | ≈ 5 µg/m³ |
| De Pere | ≈ 6 µg/m³ |
| Caledonia | ≈ 5 µg/m³ |
| Watertown | ≈ 5 µg/m³ |
| Mequon | ≈ 5 µg/m³ |
| Pleasant Prairie | ≈ 5 µg/m³ |
| Germantown | ≈ 5 µg/m³ |
| Howard | ≈ 6 µg/m³ |
| Marshfield | ≈ 3 µg/m³ |
| Onalaska | ≈ 4 µg/m³ |
| Cudahy | ≈ 5 µg/m³ |
| Wisconsin Rapids | ≈ 4 µg/m³ |
| Menasha | ≈ 5 µg/m³ |
| Ashwaubenon | ≈ 6 µg/m³ |
| Beaver Dam | ≈ 5 µg/m³ |
| Menomonie | ≈ 4 µg/m³ |
| Kaukauna | ≈ 5 µg/m³ |
Updated 2026-10-01 23:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.