St. Paul Air Quality in 2019
In 2019, St. Paul's air quality (Minneapolis-St. Paul-Bloomington, MN-WI area) had a median daily AQI of 52 (Moderate) across 365 monitored days. 1 day (0.3%) reached Unhealthy for Sensitive Groups or worse, 159 were Good, and the year's peak AQI was 122 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 225 of those days. The cleanest month of 2019 was October (median AQI 37, 0 days above 100) and the worst was June (median 50, 1 day above 100, peak 122).
- Good: 43.6%
- Moderate: 56.2%
- Unhealthy for Sensitive Groups: 0.3%
- Unhealthy or worse: 0.0%
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How was St. Paul's air quality in 2019?
Moderate on a typical day: median AQI 52, with 1 day above AQI 100 out of 365 monitored — the 2nd cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 122 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 225 days.
- ✓Cleanest month: October; worst: June.
Frequently asked questions
What was the average AQI in St. Paul in 2019?▾
EPA's Air Quality System puts St. Paul's (Minneapolis-St. Paul-Bloomington, MN-WI) median daily AQI for 2019 at 52, which is Moderate. 1 day were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 122.
Which month had the worst air quality in St. Paul in 2019?▾
The cleanest month of 2019 was October (median AQI 37, 0 days above 100) and the worst was June (median 50, 1 day above 100, peak 122).
Was 2019 a good or bad year for St. Paul's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 2nd cleanest by days above AQI 100. 2019's median of 52 is in line with the area's typical annual median of 50.
St. Paul month by month in 2019
St. Paul air quality month by month, 2019 (Minneapolis-St. Paul-Bloomington, MN-WI, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 54 | 0 | 78 | PM2.5 |
| February | 28 | 60 | 0 | 91 | PM2.5 |
| March | 31 | 58 | 0 | 87 | PM2.5 |
| April | 30 | 47 | 0 | 78 | O3 |
| May | 31 | 42 | 0 | 77 | O3 |
| Juneworst | 30 | 50 | 1 | 122 | O3 |
| July | 31 | 53 | 0 | 88 | PM2.5 |
| August | 31 | 49 | 0 | 70 | PM10 |
| September | 30 | 43 | 0 | 57 | PM2.5 |
| Octobercleanest | 31 | 37 | 0 | 74 | PM2.5 |
| November | 30 | 53 | 0 | 69 | PM2.5 |
| December | 31 | 59 | 0 | 99 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 2nd cleanest by days above AQI 100.
2019's median of 52 is in line with 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 31 (PM2.5). 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.