Sioux Falls Air Quality in July
Across 2019–2025, Sioux Falls's July air quality had a median AQI of 44 (Good) over 216 monitored days in the Sioux Falls, SD area. 3.3% of July days (7 of 216) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 59.3% of days. The cleanest July on record here was 2024 (median AQI 36, 0 days above 100) and the worst was 2021 (median 59, 3 days above 100, peak AQI 193).
- Good: 67.1%
- Moderate: 29.6%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 1.9%
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
As an Amazon Associate, we earn from qualifying purchases.
How is the air in Sioux Falls in July?
Good on a typical day: median AQI 44 across 2019–2025, with 3.3% of July days above AQI 100. Ground-level ozone is the main driver.
- ✓67.1% of July days were Good (AQI 0–50), 29.6% Moderate (51–100).
- ✓7 days of 216 reached AQI 101+; the July peak was 193.
- ✓Best July: 2024; worst July: 2021.
Frequently asked questions
What is the air quality like in Sioux Falls in July?▾
Across 2019–2025, the median daily AQI in Sioux Falls in July was 44 (Good). 67.1% of days were Good, 29.6% Moderate, and 3.3% reached Unhealthy for Sensitive Groups or worse, based on 216 monitored days in EPA's Air Quality System.
Is July a good time for outdoor exercise in Sioux Falls?▾
A typical July day in Sioux Falls sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 30 of July days (3.3%) reached AQI 101+ in 2019–2025.
Which pollutant causes Sioux Falls's July air quality problems?▾
Ground-level ozone set the daily AQI on 59.3% of July days in Sioux Falls. The highest July AQI recorded in 2019–2025 was 193 (Unhealthy), in 2021.
Sioux Falls July air quality, year by year
Sioux Falls July air quality by year (Sioux Falls, SD, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 44 | 0 | 61 | O3 |
| 2020 | 31 | 42 | 0 | 68 | O3 |
| 2021worst | 31 | 59 | 3 | 193 | PM2.5 |
| 2022 | 31 | 48 | 1 | 105 | O3 |
| 2023 | 31 | 45 | 2 | 157 | O3 |
| 2024cleanest | 31 | 36 | 0 | 84 | PM2.5 |
| 2025 | 30 | 43 | 1 | 112 | PM2.5 |
What July air means in Sioux Falls
A typical July day in Sioux Falls sits in the Good range (median AQI 44), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 30 of July days (3.3%) reached AQI 101+ in 2019–2025.
July's median AQI of 44 is above Sioux Falls's whole-year median of 38, making it one of the area's dirtier periods. Nationally, the median July AQI across every EPA metro area (103,858 metro-days, 2019–2025) is 47, so Sioux Falls runs in line with the national July norm; 3.3% of its July days topped AQI 100 versus 3.6% nationally (about the same).
July is part of Sioux Falls's summer season (June, July, August); the summer 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.