SmogRank / Oconomowoc / Waukesha
Oconomowoc vs Waukesha: PM2.5 compared
Over the last year, Oconomowoc's air was 12% more polluted than Waukesha's: PM2.5 averaged 10.2 µg/m³ against 9.1, on the 349 days both cities were measured. Oconomowoc had the dirtier air on 181 of those days, Waukesha on 162. Oconomowoc was over the WHO's daily guideline of 15 µg/m³ on 65 of them, Waukesha on 28.
Right now
The last year, day by day
Month by month
Year by year
| Year | Oconomowoc | Waukesha | Days Oconomowoc was worse |
|---|---|---|---|
| 2026 so far | 54 | 52 | 148 |
| 2025 | 56 | 51 | 194 |
| 2024 | 57 | 48 | 57 |
Means in US AQI over the days both cities were measured that year; a year shows once they share 30 such days.
Each city's worst days
Oconomowoc
- 16 Jul 2026336243.0 µg/m³
- 17 Jul 2026197121.0 µg/m³
- 19 Jul 202618299.5 µg/m³
Waukesha
- 16 Jul 2026398274.0 µg/m³
- 17 Jul 2026211136.0 µg/m³
- 19 Jul 202617792.0 µg/m³
Daily means in US AQI, with µg/m³ beside them, since the index stops at its top value, over the days both cities were measured in the last year. Each date opens that day's world board.
Compare either city with another
Oconomowoc
Side by side with Mecca (United States's worst on 30 days), Gujranwala (the world's worst on 30 days).
Waukesha
Side by side with Brookfield (the nearest), Mecca (United States's worst on 30 days), Gujranwala (the world's worst on 30 days).
Use this page
SmogRank, PM2.5 daily means compared, Oconomowoc and Waukesha, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/us-oconomowoc/us-waukesha (accessed 9 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
The same rules as every SmogRank figure: reference monitors first, and a day counts with 18 measured hours. How we measure.
Updated 2026-10-09 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); Love My Air (City and County of Denver), no reuse terms published (why we use them).