SmogRank / United States / Michigan / Ypsilanti
Ypsilanti, month by month
Ypsilanti has a measured daily mean on 1,365 days since 1 January 2023. Its worst month was June 2023, at 91 US AQI (30.5 µg/m³), 81st of 1,603 cities on that month's world ranking. Its cleanest was October 2025, at 26 US AQI (4.7 µg/m³). 2025 averaged 43 US AQI (7.7 µg/m³), against 38 US AQI (6.8 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
Ypsilanti's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 9130.5 µg/m³ | 81stof 1,603 | Eastern United States and Canada, June and July 2023 United States and Canada, June 2023and 1 more |
| July 2026 | 8929.3 µg/m³ | 156thof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 6013.7 µg/m³ | 573rdof 2,508 | Northern United States and Canada, May and June 2025 |
| July 2023 | 5712.2 µg/m³ | 375thof 1,432 | Northern United States and Canada, July 2023 United States and Canada, July 2023and 1 more |
| July 2025 | 5611.7 µg/m³ | 894thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 Northern United States and Canada, July 2025 |
| January 2023 | 5511.4 µg/m³ | 373rdof 1,261 | – |
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.
Ypsilanti's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2026 | 422286.0 µg/m³ | Northern United States and Canada, July 2026 |
| 17 Jul 2026 | 291216.0 µg/m³ | Northern United States and Canada, July 2026 |
| 28 Jun 2023 | 218143.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 29 Jun 2023 | 188108.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 6 Jun 2025 | 15156.0 µg/m³ | Northern United States and Canada, May and June 2025 |
| 8 Jun 2023 | 14854.7 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 7 Jun 2023 | 14553.4 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 31 Jul 2025 | 13549.2 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 30 Jun 2023 | 12244.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 4 Aug 2025 | 12043.1 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 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, Ypsilanti, 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/ypsilanti/history (accessed 13 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.
Ypsilanti now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 01:07 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).