St. Paul Air Quality in 2024
In 2024, St. Paul's air quality (Minneapolis-St. Paul-Bloomington, MN-WI area) had a median daily AQI of 47 (Good) across 366 monitored days. 6 days (1.6%) reached Unhealthy for Sensitive Groups or worse, 208 were Good, and the year's peak AQI was 166 (Unhealthy). Fine particulate matter (PM2.5) set the daily AQI on 206 of those days. The cleanest month of 2024 was November (median AQI 38, 0 days above 100) and the worst was May (median 50, 2 days above 100, peak 152).
- Good: 56.8%
- Moderate: 41.5%
- Unhealthy for Sensitive Groups: 1.1%
- Unhealthy or worse: 0.5%
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 2024?
Good on a typical day: median AQI 47, with 6 days above AQI 100 out of 366 monitored — the 4th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 166 (Unhealthy).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 206 days.
- ✓Cleanest month: November; worst: May.
Frequently asked questions
What was the average AQI in St. Paul in 2024?▾
EPA's Air Quality System puts St. Paul's (Minneapolis-St. Paul-Bloomington, MN-WI) median daily AQI for 2024 at 47, which is Good. 6 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 166.
Which month had the worst air quality in St. Paul in 2024?▾
The cleanest month of 2024 was November (median AQI 38, 0 days above 100) and the worst was May (median 50, 2 days above 100, peak 152).
Was 2024 a good or bad year for St. Paul's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100. 2024's median of 47 is below the area's typical annual median of 50.
St. Paul month by month in 2024
St. Paul air quality month by month, 2024 (Minneapolis-St. Paul-Bloomington, MN-WI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 52 | 1 | 166 | PM2.5 |
| February | 29 | 52 | 1 | 113 | PM2.5 |
| March | 31 | 42 | 0 | 68 | O3 |
| April | 30 | 43 | 0 | 77 | O3 |
| Mayworst | 31 | 50 | 2 | 152 | O3 |
| June | 30 | 45 | 0 | 64 | O3 |
| July | 31 | 58 | 1 | 101 | PM2.5 |
| August | 31 | 48 | 0 | 89 | PM2.5 |
| September | 30 | 48 | 1 | 141 | PM2.5 |
| October | 31 | 52 | 0 | 84 | PM2.5 |
| Novembercleanest | 30 | 38 | 0 | 58 | PM2.5 |
| December | 31 | 52 | 0 | 71 | PM2.5 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 4th cleanest by days above AQI 100.
2024'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.