SmogRank / United States / South Dakota / Sioux Falls
Sioux Falls, month by month
Sioux Falls has a measured daily mean on 1,277 days since 11 January 2023. Its worst month was October 2024, at 57 US AQI (12.5 µg/m³), 359th of 2,020 cities on that month's world ranking. Its cleanest was June 2024, at 10 US AQI (1.8 µg/m³). 2025 averaged 35 US AQI (6.3 µg/m³), against 28 US AQI (5.0 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
4 months
| Month | Why |
|---|---|
| Feb 2026 | 13 of 28 days measured; a month needs 20. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 13 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Apr 2023 | 11 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 16 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 20 of 31 days measured; a month needs 22. The others: 1 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.
Sioux Falls's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| October 2024 | 5712.5 µg/m³ | 359thof 2,020 | – |
| September 2023 | 5310.4 µg/m³ | 526thof 2,176 | Northern United States, September 2023 Northern United States and Canada, August and September 2023 |
| June 2025 | 5310.4 µg/m³ | 1,179thof 2,508 | Northern United States and Canada, May and June 2025 |
| August 2025 | 5310.4 µg/m³ | 1,150thof 2,901 | Northern United States and Canada, August 2025 North-eastern United States and Canada, 29 July to 9 August 2025 |
| June 2023 | 529.8 µg/m³ | 821stof 1,603 | Eastern United States and Canada, June and July 2023 |
| July 2023 | 509.0 µg/m³ | 763rdof 1,432 | United States and Canada, July 2023 Eastern United States and Canada, June and July 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.
Sioux Falls's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2023 | 15966.6 µg/m³ | United States and Canada, July 2023 |
| 15 Jul 2023 | 15763.7 µg/m³ | United States and Canada, July 2023 |
| 6 Sept 2023 | 14252.3 µg/m³ | Northern United States and Canada, August and September 2023 |
| 6 Nov 2025 | 13147.5 µg/m³ | – |
| 1 Aug 2025 | 12545.1 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 30 Oct 2025 | 12344.4 µg/m³ | – |
| 1 Jun 2025 | 11541.2 µg/m³ | Northern United States and Canada, May and June 2025 |
| 31 Jul 2025 | 11340.4 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 16 Oct 2024 | 10838.2 µg/m³ | – |
| 11 Aug 2025 | 9532.9 µg/m³ | Northern United States and Canada, August 2025 |
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, Sioux Falls, United States, 11 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/sioux-falls/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.
Sioux Falls now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 21:07 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).