SmogRank / United States / Wisconsin / Tomah
Tomah, month by month
Tomah has a measured daily mean on 510 days since 8 May 2025. Its worst month was July 2026, at 77 US AQI (22.9 µg/m³), 254th of 2,784 cities on that month's world ranking. Its cleanest was September 2026, at 25 US AQI (4.5 µg/m³).
Every month since 2025
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
Tomah's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 7722.9 µg/m³ | 254thof 2,784 | Northern United States and Canada, July 2026 |
| 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 |
| June 2025 | 6114.3 µg/m³ | 513thof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| August 2025 | 5913.3 µg/m³ | 523rdof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| February 2026 | 529.7 µg/m³ | 1,482ndof 2,866 | – |
| December 2025 | 529.5 µg/m³ | 1,458thof 3,006 | – |
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.
Tomah's worst days
Daily means, the highest since 8 May 2025; 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, Tomah, United States, 8 May 2025 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/tomah/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.
Tomah now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 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).