Air quality · Minnesota
Air quality in Minnesota
Across the 2 Minnesota ZIPs with EPA county air-quality data, the median day is Good in all 2 (median AQI 34–45). 10 days across those counties reached Unhealthy or worse in 2025. This is a 2025 county annual summary, not a live reading.
Last verified 2026-09-24 · methodology
Air quality by ZIP code in Minnesota
EPA's 2025 annual summary for each ZIP's county. Median AQI is the typical day; lower is cleaner.
| ZIP | Median AQI | Good days | Unhealthy or worse |
|---|---|---|---|
| 55401MinneapolisHennepin County | 45 Good | 211 of 365 | 6 |
| 55811DuluthSt. Louis County | No data | ||
| 55105Saint Paul (Macalester-Groveland)Ramsey County | 34 Good | 256 of 365 | 4 |
County-level figures from EPA Air Quality System (AQS), annual county summary, joined to each ZIP by county. None of them is a measurement at a specific address.
What lands here
Pages show the 2025 median AQI category (Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, Hazardous) for the ZIP's county, plus the year's max/90th-percentile AQI and day-count breakdown by category.
Source & refresh
EPA Air Quality System (AQS), annual county summary. Refreshed annual (epa aqs publication). Primary source →
Minnesota top concern
Radon Zone 1, lead in older Twin Cities housing
Minnesota is uniformly Zone 1 radon. Twin Cities + Duluth carry LCRR lead-service-line obligations. Spring snowmelt flooding affects FEMA AE zones along the Red River + Minnesota River.
See Minnesota state page for the full state-level rollup across all 12 dimensions.
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