Minnesota · County air quality · 2025
Blue Earth County, Minnesota
Median AQI 42 (Good). 65.3% of monitored days rated Good, direct from EPA Air Quality System stations.
- 42
- Median AQI
- 65.3%
- Good-air days
- 5
- Unhealthy days
- 23%
- Cleaner than US counties
Blue Earth County's 2025 annual median AQI is 42 (Good), with 65.3% Good days
According to the U.S. EPA Air Quality System, Blue Earth County, Minnesota posted a 2025 median AQI of 42 (Good) across 357 monitored days, with 65.3% rated Good and 5 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Blue Earth County's 65.3% Good-day share places it cleaner than 23% of US counties in 2025.
- Closest median-AQI peer
- Ada County (74.0% Good, median AQI 42) is the closest nationwide median-AQI peer to Blue Earth County.
- 2024–2025 trend
- Blue Earth County's floor-qualifying Good-day share is improving from 2024 to 2025 (61.6% → 65.3%).
- Median AQI
- Median AQI: 42
According to the 2025 EPA AQS county release on PlainAirData, Blue Earth County, Minnesota ranks #581 of 951 by median AQI (42) and #728 by good-day share (65.3%). Ponce County, Puerto Rico is #1 of 951 by median AQI (3, 91.4% Good days) at good-day-share #159 ≠ largest of 7 at 100.0% Good days #1 by good-day share (100.0%, median AQI 9) at median-AQI #7.
Annual release change
What changed in the 2025 EPA annual release
- Blue Earth County's peak single-day AQI rose from 80 to 180 between the 2024 and 2025 EPA annual releases, a change of +100 points.
- Blue Earth County's Unhealthy-category days rose from 0 to 5 between the 2024 and 2025 EPA annual releases, a change of +5 days.
- Blue Earth County's Good-day share rose from 61.6% to 65.3% between the 2024 and 2025 EPA annual releases, a change of +3.6 percentage points.
- Blue Earth County's median AQI fell from 45 to 42 between the 2024 and 2025 EPA annual releases, a change of -3 points.
Data updated August 2026
- Good · 233 d · 65.3%
- Moderate · 110 d · 30.8%
- USG · 9 d · 2.5%
- Unhealthy · 5 d · 1.4%
How did Blue Earth County's air break down in 2025?
Across 357 monitored days, 233 fell in the Good band (AQI 0–50) and 5 reached Unhealthy or worse. The worst single day peaked at AQI 180 (Unhealthy).
EPA AQS →Share of monitored days at AQI 0-50 (Good band).
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
Where Blue Earth County sits nationally
COUNT-derived placement among 951 US counties with at least 100 monitored days in 2025. Blue Earth County's Good-day share is 65.3% - cleaner than 23% of that comparison set.
Blue Earth County Good-day share vs. every US county
Share of monitored days in the Good band (AQI 0–50) - EPA AQS annual release
65.3% 23rd percentile higher than 23% of 951 US counties
Each bar is a band; taller bars hold more US counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source U.S. Environmental Protection Agency, Air Quality System (AQS) · 2025
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Blue Earth County.
- PM2.5 · 256 days · 71.7%
- Ozone · 101 days · 28.3%
2024 daily-monitor rhythm in Blue Earth County
Month-by-month median AQI from EPA day-level county monitors (146 reported days in 2024). Jul posted the highest typical readings (median AQI 51, peak 72); Nov was cleanest at median 30.
Health Impact Assessment
Blue Earth County's air quality is rated Moderate based on 65.3% good air days. There were 5 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 9 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 180. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is PM2.5, driving AQI on 256 of 357 monitored days.
5-Year Air Quality Trend
Air quality is improving in Blue Earth County. Highest Good-day share: 2025 (65.3%, 233 of 357 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2024 | 90 | 56 | 0 | 0 | 45 | 80 |
| 2025 | 233 | 110 | 9 | 5 | 42 | 180 |
How does Blue Earth County compare?
How Blue Earth County compares
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Blue Earth County, Minnesota · 2020–2025
Download this county's annual AQI row as CSV , with the same EPA fields and denominator shown on this page.
Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.