SmogRank / Brookfield / Waukesha
Brookfield vs Waukesha: PM2.5 compared
Over the last year, Brookfield and Waukesha had about the same air: PM2.5 averaged 10.4 and 10.7 µg/m³, on the 188 days both cities were measured. Brookfield had the dirtier air on 65 of those days, Waukesha on 122. Brookfield was over the WHO's daily guideline of 15 µg/m³ on 37 of them, Waukesha on 18.
Right now
The last year, day by day
Month by month
Each city's worst days
Brookfield
- 16 Jul 2026391270.5 µg/m³
- 17 Jul 2026207132.0 µg/m³
- 19 Jul 202618097.5 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
Brookfield
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 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, Brookfield and Waukesha, 9 Oct 2025 – 8 Oct 2026, smogrank.com/compare/us-brookfield/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).