Sioux Falls Air Quality in February
Across 2019–2025, Sioux Falls's February air quality had a median AQI of 36 (Good) over 198 monitored days in the Sioux Falls, SD area. 0.0% of February days (0 of 198) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 65.7% of days. The cleanest February on record here was 2024 (median AQI 28, 0 days above 100) and the worst was 2019 (median 48, 0 days above 100, peak AQI 80).
- Good: 86.9%
- Moderate: 13.1%
- Unhealthy for Sensitive Groups: 0.0%
- 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 is the air in Sioux Falls in February?
Good on a typical day: median AQI 36 across 2019–2025, with 0.0% of February days above AQI 100. Ground-level ozone is the main driver.
- ✓86.9% of February days were Good (AQI 0–50), 13.1% Moderate (51–100).
- ✓0 days of 198 reached AQI 101+; the February peak was 91.
- ✓Best February: 2024; worst February: 2019.
Frequently asked questions
What is the air quality like in Sioux Falls in February?▾
Across 2019–2025, the median daily AQI in Sioux Falls in February was 36 (Good). 86.9% of days were Good, 13.1% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Sioux Falls?▾
A typical February day in Sioux Falls sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
Which pollutant causes Sioux Falls's February air quality problems?▾
Ground-level ozone set the daily AQI on 65.7% of February days in Sioux Falls. The highest February AQI recorded in 2019–2025 was 91 (Moderate), in 2019.
Sioux Falls February air quality, year by year
Sioux Falls February air quality by year (Sioux Falls, SD, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 28 | 48 | 0 | 80 | PM2.5 |
| 2020 | 29 | 37 | 0 | 52 | O3 |
| 2021 | 28 | 35 | 0 | 91 | O3 |
| 2022 | 28 | 33 | 0 | 48 | O3 |
| 2023 | 28 | 44 | 0 | 58 | O3 |
| 2024cleanest | 29 | 28 | 0 | 64 | O3 |
| 2025 | 28 | 34 | 0 | 55 | O3 |
What February air means in Sioux Falls
A typical February day in Sioux Falls sits in the Good range (median AQI 36), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of February days reached AQI 101+ in 2019–2025.
February's median AQI of 36 is in line with Sioux Falls's whole-year median of 38, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Sioux Falls runs below the national February norm; 0.0% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of Sioux Falls's winter season (December, January, February); the winter page pools all three months.
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 month 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.