SmogRank / United States / Wisconsin / Superior
Superior, month by month
Superior has a measured daily mean on 1,368 days since 1 January 2023. Its worst month was July 2026, at 135 US AQI (49.2 µg/m³), 44th of 2,784 cities on that month's world ranking. Its cleanest was April 2024, at 18 US AQI (3.3 µg/m³). 2025 averaged 52 US AQI (9.7 µg/m³), against 34 US AQI (6.1 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
Superior's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 13549.2 µg/m³ | 44thof 2,784 | Northern United States and Canada, July 2026 |
| July 2025 | 8426.6 µg/m³ | 115thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 Northern United States, July 2025and 1 more |
| August 2025 | 7120.1 µg/m³ | 201stof 2,901 | Northern United States and Canada, August 2025 North-eastern United States and Canada, 29 July to 9 August 2025 |
| June 2023 | 7119.7 µg/m³ | 273rdof 1,603 | Eastern United States and Canada, June and July 2023 United States and Canada, June 2023and 1 more |
| June 2025 | 6013.7 µg/m³ | 573rdof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| July 2023 | 5712.3 µg/m³ | 365thof 1,432 | Northern United States and Canada, July 2023 United States and Canada, July 2023and 1 more |
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.
Superior's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2026 | 500+548.0 µg/m³ | Northern United States and Canada, July 2026 |
| 15 Jul 2026 | 500+339.0 µg/m³ | Northern United States and Canada, July 2026 |
| 17 Jul 2026 | 342246.0 µg/m³ | Northern United States and Canada, July 2026 |
| 12 Jul 2025 | 194117.0 µg/m³ | Northern United States and Canada, July 2025 |
| 30 Jul 2025 | 188108.0 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 31 Jul 2025 | 184102.0 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 1 Aug 2025 | 17792.3 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 3 Jun 2025 | 17488.7 µg/m³ | Northern United States and Canada, May and June 2025 |
| 2 Aug 2025 | 15866.1 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 13 Jul 2025 | 15763.5 µg/m³ | Northern United States and Canada, July 2025 |
Daily means, the highest since 1 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, Superior, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/superior/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.
Superior 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).