Sioux Falls Air Quality in 2025
In 2025, Sioux Falls's air quality (Sioux Falls, SD area) had a median daily AQI of 36 (Good) across 364 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 294 were Good, and the year's peak AQI was 125 (Unhealthy for Sensitive Groups). Ground-level ozone set the daily AQI on 231 of those days. The cleanest month of 2025 was November (median AQI 28, 0 days above 100) and the worst was August (median 41, 2 days above 100, peak 125).
- Good: 80.8%
- Moderate: 18.1%
- Unhealthy for Sensitive Groups: 1.1%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Sioux Falls
Today's main pollutant in Sioux Falls is ground-level ozone (AQI 24). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How was Sioux Falls's air quality in 2025?
Good on a typical day: median AQI 36, with 4 days above AQI 100 out of 364 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 125 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone was the main pollutant on 231 days.
- ✓Cleanest month: November; worst: August.
Frequently asked questions
What was the average AQI in Sioux Falls in 2025?▾
EPA's Air Quality System puts Sioux Falls's (Sioux Falls, SD) median daily AQI for 2025 at 36, which is Good. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 125.
Which month had the worst air quality in Sioux Falls in 2025?▾
The cleanest month of 2025 was November (median AQI 28, 0 days above 100) and the worst was August (median 41, 2 days above 100, peak 125).
Was 2025 a good or bad year for Sioux Falls's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100. 2025's median of 36 is in line with the area's typical annual median of 38.
Sioux Falls month by month in 2025
Sioux Falls air quality month by month, 2025 (Sioux Falls, SD, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 31 | 0 | 37 | O3 |
| February | 28 | 34 | 0 | 55 | O3 |
| March | 31 | 38 | 0 | 71 | O3 |
| April | 30 | 40 | 0 | 61 | O3 |
| May | 31 | 40 | 0 | 80 | O3 |
| June | 30 | 51 | 1 | 115 | O3 |
| July | 30 | 43 | 1 | 112 | PM2.5 |
| Augustworst | 31 | 41 | 2 | 125 | PM2.5 |
| September | 30 | 42 | 0 | 74 | PM2.5 |
| October | 31 | 32 | 0 | 64 | O3 |
| Novembercleanest | 30 | 28 | 0 | 44 | O3 |
| December | 31 | 29 | 0 | 54 | O3 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 5th cleanest by days above AQI 100.
2025's median of 36 is in line with the area's typical annual median of 38.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Sioux Falls
The latest EPA AirNow observation puts Sioux Falls's AQI at 24 (O3). The figures above are multi-year annual statistics, not today's reading.
View current Sioux Falls air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Sioux Falls, SD), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.