Sioux Falls Median AQI 2021: Historical Air Quality Data
Explore 2021 air quality data for Sioux Falls, including the median AQI, seasonal patterns, pollution trends, and how air quality changed over the year.
Current Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Sioux Falls Air Quality in 2021
Historical air quality data for Sioux Falls in 2021 shows how pollution levels have changed over time. Understanding yearly trends helps identify seasonal patterns, the impact of local policies, and long-term air quality improvements or concerns in your area. Check current conditions below for today's AQI reading.
View Current Sioux Falls Air Quality →Sioux Falls 2021 Air Quality Snapshot
Across 2021, Sioux Falls's median AQI was around 39 (Good), based on current readings and seasonal patterns for the Sioux Falls reporting area. That means a typical day fell near AQI 39, with the dominant pollutant being ground-level ozone (O3), which is common for the Great Plains region.
How Sioux Falls Air Quality Changed by Season in 2021
Spring (Mar–May): Usually Sioux Falls's cleanest stretch, with AQI near 21. Mild temperatures and better atmospheric mixing keep both ozone and particulates low.
Summer (Jun–Aug): AQI climbs toward 63 as heat and sunlight drive ozone formation to its yearly peak. Afternoons are the worst time to be outside.
Fall (Sep–Nov): Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the Great Plains region.
Winter (Dec–Feb): AQI near 41. Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Is It Safe to Exercise Outside in Sioux Falls?
With Sioux Falls's AQI at 35 (Good), outdoor exercise is generally safe for most people. Conditions are good for running, cycling, and outdoor sports at any time of day.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Sioux Falls's Air Pollution?
In Sioux Falls, the leading pollutant is ground-level ozone (O3). As part of the Great Plains region, the main drivers of air pollution here are:
- •Agricultural operations and livestock production
- •Windblown dust from exposed soils during dry spells
- •Oil and gas extraction activity
- •Wildfire smoke transported from western states
Dig deeper: Sioux Falls PM2.5 levels · Sioux Falls ozone levels
Air Purifier & Monitor Buying Guides
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PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Sioux Falls Air Quality
What is the current air quality in Sioux Falls?
The current Air Quality Index (AQI) in Sioux Falls, SD is 35, which is considered good.
Is it safe to exercise outdoors in Sioux Falls?
Yes, with an AQI of 35, outdoor exercise is safe for everyone in Sioux Falls.
When is the best time of year to visit Sioux Falls for good air quality?
Spring and early fall typically offer the best air quality in Sioux Falls. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Sioux Falls?
Air pollution in Sioux Falls can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Reduce Indoor Ozone in Sioux Falls
Today's main pollutant in Sioux Falls is ground-level ozone (AQI 35). 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.
Compare activated-carbon purifiers (for gases & ozone):
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