Beresford, South Dakota Air Quality
Beresford has a median AQI of 44, earning an air quality grade of A- — excellent air quality that ranks better than 41% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2021, Beresford recorded 179 good air quality days (66% of monitored days) and 4 unhealthy days.
Population: 2,360 • County: Union
Current AQI
Quick Facts
| Current AQI | 20 — Good |
| Air Quality Grade | A- |
| Median AQI (2021) | 44 |
| vs. U.S. Cities | Better than 41% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 4 |
| 10-Year Trend | ↓ Worsening |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Beresford is sourced from the SF-USD monitoring area, located approximately 36 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Beresford typically sees its worst air quality during summer afternoons when heat and sunlight drive ground-level ozone formation from vehicle and industrial emissions. Morning readings are generally 15–25 points lower than afternoon peaks. Outdoor activity is best planned for early morning on high-ozone days.
AQI Trend (10 Years)
Air Quality Days by Year
Beresford Median AQI by Year
Annual EPA air quality data for Beresford — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2021 | 44 | 179 | 4 | 167 | Ozone |
| 2020 | 39 | 304 | 1 | 141 | Ozone |
| 2019 | 37 | 306 | — | 97 | Ozone |
| 2018 | 43 | 256 | 3 | 112 | Ozone |
| 2017 | 41 | 278 | — | 100 | Ozone |
| 2016 | 38 | 295 | 2 | 112 | Ozone |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2021 Air Quality Summary
Primary Pollutant Days (2021)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Beresford Air Quality
What is the air quality in Beresford today?
The current AQI in Beresford is 20, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Beresford getting better or worse?
Air quality in Beresford has been worsening. The median AQI has risen 6 points (from 38 in 2016 to 44 in 2021), a concern for local health officials.
What is the most common air pollutant in Beresford?
Ozone is the primary air pollutant in Beresford, responsible for 155 days (57% of monitored days) in 2021. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does Beresford have per year?
In 2021, Beresford recorded 66% good air quality days (179 days) out of 273 monitored days. There were 2 Unhealthy for Sensitive Groups days and 2 Unhealthy days (AQI above 100). The highest single-day AQI recorded was 167.
What air quality grade does Beresford receive?
Beresford receives an air quality grade of A-, placing it better than 41% of US cities. This is based on a median AQI of 44 in 2021, with 179 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 41% of US cities
Nearby Cities
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National Rankings
See how Beresford compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Beresford
Beresford has a summer ozone problem — hot afternoons push AQI into Moderate or higher as sunlight converts vehicle and industrial emissions into ground-level ozone. Activated carbon and PECO filters chemically neutralize ozone rather than just trapping particles.
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