Sioux Falls Air Quality in Spring
Across 2019–2025, Sioux Falls's spring (March–May) air quality had a median AQI of 41 (Good) over 628 monitored days in the Sioux Falls, SD area. 1.6% of spring days (10 of 628) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 77.1% of days. The cleanest spring on record here was 2024 (median AQI 35, 0 days above 100) and the worst was 2023 (median 49, 10 days above 100, peak AQI 181).
- Good: 80.9%
- Moderate: 17.5%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 0.2%
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 spring?
Good on a typical day: median AQI 41 across 2019–2025, with 1.6% of spring days above AQI 100. Ground-level ozone is the main driver.
- ✓80.9% of spring days were Good (AQI 0–50), 17.5% Moderate (51–100).
- ✓10 days of 628 reached AQI 101+; the spring peak was 181.
- ✓Cleanest month: April; worst month: May.
Frequently asked questions
What is the air quality like in Sioux Falls in spring?▾
Across 2019–2025, the median daily AQI in Sioux Falls in spring was 41 (Good). 80.9% of days were Good, 17.5% Moderate, and 1.6% reached Unhealthy for Sensitive Groups or worse, based on 628 monitored days in EPA's Air Quality System.
Is spring a good time for outdoor exercise in Sioux Falls?▾
A typical spring day in Sioux Falls sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 63 of spring days (1.6%) reached AQI 101+ in 2019–2025.
Which pollutant causes Sioux Falls's spring air quality problems?▾
Ground-level ozone set the daily AQI on 77.1% of spring days in Sioux Falls. The highest spring AQI recorded in 2019–2025 was 181 (Unhealthy), in 2023.
Sioux Falls spring air quality, year by year
Sioux Falls spring air quality by year (Sioux Falls, SD, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 92 | 43 | 0 | 80 | O3 |
| 2020 | 92 | 36 | 0 | 75 | O3 |
| 2021 | 76 | 41 | 0 | 70 | O3 |
| 2022 | 92 | 41 | 0 | 81 | O3 |
| 2023worst | 92 | 49 | 10 | 181 | O3 |
| 2024cleanest | 92 | 35 | 0 | 81 | O3 |
| 2025 | 92 | 39 | 0 | 80 | O3 |
What spring air means in Sioux Falls
A typical spring day in Sioux Falls sits in the Good range (median AQI 41), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 63 of spring days (1.6%) reached AQI 101+ in 2019–2025.
Spring's median AQI of 41 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 Spring AQI across every EPA metro area (307,196 metro-days, 2019–2025) is 43, so Sioux Falls runs in line with the national Spring norm; 1.6% of its Spring days topped AQI 100 versus 0.8% nationally (about the same).
Within the season, April is the cleanest month (median AQI 40, 0.0% of days above 100) and May the worst (median 44, 4.2% above 100).
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 season 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.