SmogRank / United States / Michigan / Southfield
Southfield, month by month
Southfield has a measured daily mean on 673 days since 20 March 2024. Its worst month was July 2026, at 93 US AQI (31.8 µg/m³), 116th of 2,784 cities on that month's world ranking. Its cleanest was May 2025, at 26 US AQI (4.7 µg/m³).
Every month since 2024
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
9 months
| Month | Why |
|---|---|
| Nov 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 1 of 31 days measured; a month needs 22. The others: 11 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.
Southfield's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 9331.8 µg/m³ | 116thof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 6114.5 µg/m³ | 493rdof 2,508 | Northern United States and Canada, May and June 2025 |
| July 2025 | 5913.2 µg/m³ | 603rdof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 Northern United States and Canada, July 2025and 1 more |
| August 2025 | 5812.6 µg/m³ | 654thof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| February 2026 | 5712.4 µg/m³ | 979thof 2,866 | North-eastern United States and Canada, 14 to 19 February 2026 North-eastern United States and Canada, 2 to 3 February 2026 |
| February 2025 | 498.8 µg/m³ | 1,385thof 2,633 | – |
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.
Southfield's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2026 | 443297.0 µg/m³ | Northern United States and Canada, July 2026 |
| 17 Jul 2026 | 287212.0 µg/m³ | Northern United States and Canada, July 2026 |
| 15 Jul 2026 | 15256.5 µg/m³ | Northern United States and Canada, July 2026 |
| 6 Jun 2025 | 15156.1 µg/m³ | Northern United States and Canada, May and June 2025 |
| 4 Aug 2025 | 15156.1 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 31 Jul 2025 | 14452.9 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 5 Jun 2025 | 13448.7 µg/m³ | Northern United States and Canada, May and June 2025 |
| 15 Feb 2026 | 12143.5 µg/m³ | North-eastern United States and Canada, 14 to 19 February 2026 |
| 15 Jul 2025 | 11741.8 µg/m³ | Northern United States and Canada, July 2025 |
| 19 Jul 2026 | 11039.0 µg/m³ | Northern United States and Canada, July 2026 |
Daily means, the highest since 20 Mar 2024; 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, Southfield, United States, 20 Mar 2024 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/southfield/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.
Southfield now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 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).