SmogRank / United States / Wisconsin / Milwaukee
Milwaukee, month by month
Milwaukee has a measured daily mean on 1,206 days since 11 January 2023. Its worst month was June 2023, at 97 US AQI (33.7 µg/m³), 56th of 1,603 cities on that month's world ranking. Its cleanest was April 2024, at 28 US AQI (5.1 µg/m³). 2025 averaged 51 US AQI (9.2 µg/m³), against 42 US AQI (7.6 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
7 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 11 with no readings from the monitor. |
| Sep 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 7 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Milwaukee's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 9733.7 µg/m³ | 56thof 1,603 | Eastern United States and Canada, June and July 2023 North-eastern United States, June 2023and 2 more |
| July 2025 | 6617.0 µg/m³ | 287thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 Northern United States, July 2025and 1 more |
| August 2025 | 6315.5 µg/m³ | 325thof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| June 2025 | 6114.5 µg/m³ | 493rdof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| July 2023 | 6114.3 µg/m³ | 183rdof 1,432 | Northern United States and Canada, July 2023 United States and Canada, July 2023and 2 more |
| May 2023 | 5511.3 µg/m³ | 319thof 1,600 | Eastern United States and Canada, May and June 2023 Northern United States and Canada, May 2023 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Milwaukee's worst days
Daily means, the highest since 11 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Milwaukee, United States, 11 Jan 2023 – 16 Jul 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/milwaukee/history (accessed 12 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.
Milwaukee now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).