St. Paul Air Quality in 2025
In 2025, St. Paul's air quality (Minneapolis-St. Paul-Bloomington, MN-WI area) had a median daily AQI of 47 (Good) across 365 monitored days. 11 days (3.0%) reached Unhealthy for Sensitive Groups or worse, 201 were Good, and the year's peak AQI was 178 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 226 of those days. The cleanest month of 2025 was January (median AQI 35, 0 days above 100) and the worst was July (median 66, 5 days above 100, peak 175).
- Good: 55.1%
- Moderate: 41.9%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 1.6%
Reduce Indoor Ozone in St. Paul
Today's main pollutant in St. Paul is ground-level ozone (AQI 25). 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 St. Paul's air quality in 2025?
Good on a typical day: median AQI 47, with 11 days above AQI 100 out of 365 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 178 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 226 days.
- ✓Cleanest month: January; worst: July.
Frequently asked questions
What was the average AQI in St. Paul in 2025?▾
EPA's Air Quality System puts St. Paul's (Minneapolis-St. Paul-Bloomington, MN-WI) median daily AQI for 2025 at 47, which is Good. 11 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 178.
Which month had the worst air quality in St. Paul in 2025?▾
The cleanest month of 2025 was January (median AQI 35, 0 days above 100) and the worst was July (median 66, 5 days above 100, peak 175).
Was 2025 a good or bad year for St. Paul's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100. 2025's median of 47 is below the area's typical annual median of 50.
St. Paul month by month in 2025
St. Paul air quality month by month, 2025 (Minneapolis-St. Paul-Bloomington, MN-WI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 31 | 35 | 0 | 71 | PM2.5 |
| February | 28 | 45 | 0 | 81 | PM2.5 |
| March | 31 | 42 | 0 | 69 | O3 |
| April | 30 | 46 | 0 | 76 | O3 |
| May | 31 | 52 | 0 | 97 | O3 |
| June | 30 | 59 | 4 | 178 | PM2.5 |
| Julyworst | 31 | 66 | 5 | 175 | PM2.5 |
| August | 31 | 56 | 2 | 173 | PM2.5 |
| September | 30 | 55 | 0 | 77 | PM2.5 |
| October | 31 | 39 | 0 | 74 | PM2.5 |
| November | 30 | 38 | 0 | 63 | PM2.5 |
| December | 31 | 50 | 0 | 71 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 6th cleanest by days above AQI 100.
2025's median of 47 is below the area's typical annual median of 50.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in St. Paul
The latest EPA AirNow observation puts St. Paul's AQI at 25 (O3). The figures above are multi-year annual statistics, not today's reading.
View current St. Paul air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Minneapolis-St. Paul-Bloomington, MN-WI), 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.