Sioux Falls Air Quality in 2020
In 2020, Sioux Falls's air quality (Sioux Falls, SD area) had a median daily AQI of 38 (Good) across 366 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 298 were Good, and the year's peak AQI was 90 (Moderate). Ground-level ozone set the daily AQI on 205 of those days. The cleanest month of 2020 was November (median AQI 31, 0 days above 100) and the worst was June (median 54, 0 days above 100, peak 90).
- Good: 81.4%
- Moderate: 18.6%
- 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 33). 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 2020?
Good on a typical day: median AQI 38, with 0 days above AQI 100 out of 366 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2020: 90 (Moderate).
- ✓Ground-level ozone was the main pollutant on 205 days.
- ✓Cleanest month: November; worst: June.
Frequently asked questions
What was the average AQI in Sioux Falls in 2020?▾
EPA's Air Quality System puts Sioux Falls's (Sioux Falls, SD) median daily AQI for 2020 at 38, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 90.
Which month had the worst air quality in Sioux Falls in 2020?▾
The cleanest month of 2020 was November (median AQI 31, 0 days above 100) and the worst was June (median 54, 0 days above 100, peak 90).
Was 2020 a good or bad year for Sioux Falls's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2020's median of 38 is in line with the area's typical annual median of 38.
Sioux Falls month by month in 2020
Sioux Falls air quality month by month, 2020 (Sioux Falls, SD, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 36 | 0 | 61 | PM2.5 |
| February | 29 | 37 | 0 | 52 | O3 |
| March | 31 | 35 | 0 | 47 | O3 |
| April | 30 | 37 | 0 | 75 | O3 |
| May | 31 | 38 | 0 | 61 | PM2.5 |
| Juneworst | 30 | 54 | 0 | 90 | O3 |
| July | 31 | 42 | 0 | 68 | O3 |
| August | 31 | 41 | 0 | 58 | O3 |
| September | 30 | 40 | 0 | 67 | O3 |
| October | 31 | 35 | 0 | 65 | PM2.5 |
| Novembercleanest | 30 | 31 | 0 | 62 | O3 |
| December | 31 | 33 | 0 | 86 | PM2.5 |
How 2020 compares
Among the 7 years EPA has published for the area (2019–2025), 2020 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2020's median of 38 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 33 (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.