St. Paul Air Quality in February
Across 2019–2025, St. Paul's February air quality had a median AQI of 54 (Moderate) over 198 monitored days in the Minneapolis-St. Paul-Bloomington, MN-WI area. 0.5% of February days (1 of 198) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 85.4% of days. The cleanest February on record here was 2025 (median AQI 45, 0 days above 100) and the worst was 2024 (median 52, 1 day above 100, peak AQI 113).
- Good: 36.9%
- Moderate: 62.6%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
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 is the air in St. Paul in February?
Moderate on a typical day: median AQI 54 across 2019–2025, with 0.5% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓36.9% of February days were Good (AQI 0–50), 62.6% Moderate (51–100).
- ✓1 day of 198 reached AQI 101+; the February peak was 113.
- ✓Best February: 2025; worst February: 2024.
Frequently asked questions
What is the air quality like in St. Paul in February?▾
Across 2019–2025, the median daily AQI in St. Paul in February was 54 (Moderate). 36.9% of days were Good, 62.6% Moderate, and 0.5% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in St. Paul?▾
A typical February day in St. Paul is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of February days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes St. Paul's February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 85.4% of February days in St. Paul. The highest February AQI recorded in 2019–2025 was 113 (Unhealthy for Sensitive Groups), in 2024.
St. Paul February air quality, year by year
St. Paul February air quality by year (Minneapolis-St. Paul-Bloomington, MN-WI, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 28 | 60 | 0 | 91 | PM2.5 |
| 2020 | 29 | 55 | 0 | 68 | PM2.5 |
| 2021 | 28 | 58 | 0 | 96 | PM2.5 |
| 2022 | 28 | 53 | 0 | 71 | PM2.5 |
| 2023 | 28 | 54 | 0 | 73 | PM2.5 |
| 2024worst | 29 | 52 | 1 | 113 | PM2.5 |
| 2025cleanest | 28 | 45 | 0 | 81 | PM2.5 |
What February air means in St. Paul
A typical February day in St. Paul is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of February days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
February's median AQI of 54 is above St. Paul's whole-year median of 50, making it one of the area's dirtier periods. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so St. Paul runs above the national February norm; 0.5% of its February days topped AQI 100 versus 0.4% nationally (about the same).
February is part of St. Paul's winter season (December, January, February); the winter page pools all three months.
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 month 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.