Median AQI
36
Good
Minnesota · County air quality · 2025
Beltrami County, Minnesota
Median AQI 36 (Good). 79.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 36
- Median AQI
- 79.1%
- Good-air days
- 9
- Unhealthy days
- 54%
- Cleaner than US counties
Beltrami County's 2025 annual median AQI is 36 (Good), with 79.1% Good days
According to the U.S. EPA Air Quality System, Beltrami County, Minnesota posted a 2025 median AQI of 36 (Good) across 363 monitored days, with 79.1% rated Good and 9 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Beltrami County's 79.1% Good-day share places it cleaner than 54% of US counties in 2025.
- Closest median-AQI peer
- Ashland County (81.6% Good, median AQI 36) is the closest nationwide median-AQI peer to Beltrami County.
- 2020–2025 trend
- Beltrami County's floor-qualifying Good-day share is worsening from 2020 to 2025 (88.6% → 79.1%).
- Median AQI
- Median AQI: 36
The verdict
According to EPA Air Quality System monitoring data, Beltrami County's air is good on balance, cleaner than the median US county, a median AQI of 36 with 79.1% of 363 monitored days in the Good band, driven mainly by PM2.5.
- 36
- median AQI · Good
- 79.1%
- days rated Good
- PM2.5
- main pollutant
- 54%
- cleaner than US counties
9 days reached Unhealthy or worse; the worst single reading hit AQI 191.
Annual release change
What changed in the 2025 EPA annual release
- Beltrami County's Unhealthy-category days rose from 1 to 9 between the 2024 and 2025 EPA annual releases, a change of +8 days.
- Beltrami County's Good-day share fell from 84.2% to 79.1% between the 2024 and 2025 EPA annual releases, a change of -5.1 percentage points.
- Beltrami County's peak single-day AQI rose from 177 to 191 between the 2024 and 2025 EPA annual releases, a change of +14 points.
Data updated August 2026
- Good · 287 d · 79.1%
- Moderate · 59 d · 16.3%
- USG · 8 d · 2.2%
- Unhealthy · 9 d · 2.5%
How did Beltrami County's air break down in 2025?
Across 363 monitored days, 287 fell in the Good band (AQI 0–50) and 9 reached Unhealthy or worse. The worst single day peaked at AQI 191 (Unhealthy).
EPA AQS →Air quality data from EPA Air Quality System (2025). 363 days monitored. Median AQI: 36 (Good).
Insights: Beltrami County, Minnesota. EPA monitors recorded a median Air Quality Index of 36 across 363 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 287 (79%) fell in the Good band (AQI 0–50), 59 (16%) registered Moderate readings, and 8 (2%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 69, while the worst single-day peak hit 191 (Unhealthy). Residents averaged about 23.7 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (225 days), Ozone (138 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -9.5 points and the median AQI moved +6 points, placing the multi-year trajectory at worsening. The annual record contains 9 days at Unhealthy or worse. On those days, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Anoka (74.1% good, AQI 38); Becker (74.0% good, AQI 38); Blue Earth (65.3% good, AQI 42); Carlton (82.8% good, AQI 33); Cass (82.7% good, AQI 28); Cook (88.0% good, AQI 16).
Air Quality Summary
Good Days
79.1%
287 of 363 monitored days
4.1pp vs 75% target
Max AQI Recorded
191
Unhealthy
Health Grade
Good
90th-pct AQI 69
Beltrami County, Good days share 79.1%
National avg
Share of monitored days at AQI 0-50 (Good band).
Beltrami County, Unhealthy-or-worse share 24.8%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 363 monitored days across EPA AQI categories.
Good
287
79%
Moderate
59
16%
USG
8
2%
Unhealthy
9
2%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Beltrami County.
- PM2.5 · 225 days · 62.0%
- Ozone · 138 days · 38.0%
Health Impact Assessment
Good
Beltrami County's air quality is rated Good based on 79.1% good air days. There were 9 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 8 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 191. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is PM2.5, driving AQI on 225 of 363 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Beltrami County. Highest Good-day share: 2022 (91.9%, 318 of 346 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 318 | 41 | 0 | 0 | 30 | 76 |
| 2021 | 281 | 51 | 5 | 2 | 29 | 283 |
| 2022 | 318 | 28 | 0 | 0 | 23 | 65 |
| 2023 | 247 | 107 | 5 | 1 | 27 | 156 |
| 2024 | 308 | 54 | 3 | 1 | 36 | 177 |
| 2025 | 287 | 59 | 8 | 9 | 36 | 191 |
How does Beltrami County compare?
How Beltrami County compares
Good-day share better than US avg
Beltrami County 79.1%
Ashland County, Wisconsin 81.6%
US average 76.0%
Median AQI better than US avg
Beltrami County 36
Ashland County, Wisconsin 36
US average 39
Unhealthy days / yr worse than US avg
Beltrami County 9
Ashland County, Wisconsin 8
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Beltrami County (36), not geographic neighbors.
Ashland County, Wisconsin
Median AQI 36 · 81.6% Good-day share
Atlantic County, New Jersey
Median AQI 36 · 82.2% Good-day share
Bannock County, Idaho
Median AQI 36 · 88.8% Good-day share
Barnstable County, Massachusetts
Median AQI 36 · 93.7% Good-day share
Benton County, Washington
Median AQI 36 · 80.3% Good-day share
Brooke County, West Virginia
Median AQI 36 · 73.0% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Anchorage County, Alaska
79.2% Good-day share · median AQI 26
Washington County, Oregon
79.2% Good-day share · median AQI 36
Morgan County, Alabama
78.9% Good-day share · median AQI 41
Ravalli County, Montana
79.2% Good-day share · median AQI 21
Richmond City County, Virginia
78.9% Good-day share · median AQI 36
Nassau County, New York
78.8% Good-day share · median AQI 29
Minnesota counties on the map
Geographic containment only, other monitored counties in Minnesota, independent of AQI or pollutant match.
What Beltrami County's air means for you
On most days the air here is fine, but PM2.5 drives 9 unhealthy-or-worse days a year that sensitive groups should plan around.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 36 means for exposure. Health guidance
- See how Beltrami County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Beltrami County with its Minnesota neighbours before drawing a conclusion about the region. All of Minnesota
Based on 363 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Beltrami County, Minnesota? ▼
Beltrami County has a median Air Quality Index (AQI) of 36, rated "Good." 79.1% of monitored days (287 out of 363) had good air quality in 2025.
What is the main pollutant in Beltrami County? ▼
The primary pollutant in Beltrami County is Fine Particles (PM2.5), which was the main AQI driver on 225 days (62% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Beltrami County have? ▼
In 2025, Beltrami County recorded 9 unhealthy air days (9 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 191.
Is the air quality in Beltrami County getting better or worse? ▼
Air quality in Beltrami County is worsening across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2022 at 91.9% (318 of 346 days). Lowest qualifying Good-day share: 2023 at 68.6% (247 of 360 days).
What does AQI 36 mean for health? ▼
Beltrami County's median AQI of 36 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Beltrami County compare to other counties in Minnesota? ▼
Beltrami County has 79.1% good air days. Nearby counties in Minnesota: Anoka (74.1% good), Becker (74.0% good), Blue Earth (65.3% good), Carlton (82.8% good), Cass (82.7% good), Cook (88.0% good).
What is the 90th percentile AQI in Beltrami County? ▼
The 90th percentile AQI for Beltrami County is 69, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 191 (Unhealthy).
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 Beltrami County, Minnesota · 2020–2025
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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.