South St. Paul, Minnesota Air Quality
South St. Paul has a median AQI of 9, earning an air quality grade of A+ — excellent air quality that ranks better than 98% of US cities. Air quality has been improving steadily over the past decade, a positive sign for residents. CO is the primary pollutant driving air quality conditions. In 2025, South St. Paul recorded 170 good air quality days (93% of monitored days).
Population: 20,611 • County: Dakota
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Quick Facts
| Current AQI | 12 — Good |
| Air Quality Grade | A+ |
| Median AQI (2025) | 9 |
| vs. U.S. Cities | Better than 98% |
| Primary Pollutant | CO |
| Unhealthy Days/Year | 0 |
| 10-Year Trend | ↑ Improving |
| Data Source | EPA AirNow |
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 30 Days
Current Pollutant Levels
Real-time data from EPA AirNow
AQI Trend (10 Years)
Air Quality Days by Year
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About South St. Paul Air Quality
What is the air quality in South St. Paul today?
The current AQI in South St. Paul is 12, which is rated "Good". Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in South St. Paul getting better or worse?
Air quality in South St. Paul has been improving over the past decade. The median AQI dropped from 34 in 2016 to 9 in 2025.
What is the most common air pollutant in South St. Paul?
CO is the primary air pollutant in South St. Paul, responsible for the most air quality-impacted days in 2025.
How many unhealthy air days does South St. Paul have per year?
In 2025, South St. Paul had 0 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 170 good days and 12 moderate days out of 182 days monitored.
What air quality grade does South St. Paul receive?
South St. Paul receives an air quality grade of A+, placing it better than 98% of US cities. This grade is based on a median AQI of 9 for 2025, derived from EPA monitoring data.
Air Quality Grade
Better than 98% of US cities
Nearby Cities
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National Rankings
See how South St. Paul compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for South St. Paul
Based on your area's air quality (median AQI: 9), we recommend these air purifiers to help protect your health indoors.
RabbitAir MinusA2
Stylish wall-mountable design with customizable artwork panels.
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Other Great Options
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
Dyson Pure Cool TP04
Premium all-in-one air purifier and fan with advanced features.
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Read our complete buying guide →