Median AQI
37
Good
Minnesota · County air quality · 2025
Beltrami County, Minnesota
Median AQI 37 (Good). 88.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 37
- Median AQI
- 88.8%
- Good-air days
- 0
- Unhealthy days
- 73%
- Cleaner than US counties
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 37 with 88.8% of 169 monitored days in the Good band, driven mainly by Ozone.
- 37
- median AQI · Good
- 88.8%
- days rated Good
- Ozone
- main pollutant
- 73%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 108.
Data updated July 2026
- Good · 150 d · 88.8%
- Moderate · 15 d · 8.9%
- USG · 4 d · 2.4%
How did Beltrami County's air break down in 2025?
Across 169 monitored days, 150 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 108 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 169 days monitored. Median AQI: 37 (Good).
Insights: Beltrami County, Minnesota. EPA monitors recorded a median Air Quality Index of 37 across 169 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 150 (89%) fell in the Good band (AQI 0–50), 15 (9%) registered Moderate readings, and 4 (2%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 51, while the worst single-day peak hit 108 (USG). Residents averaged about 26.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (108 days), PM2.5 (61 days). Across the 2020–2025 trend window, good days shifted by -168 and the median AQI moved +7 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 108, usg but never Unhealthy. Nearby counties show comparable readings: Anoka (82.1% good, AQI 38); Becker (84.7% good, AQI 38); Blue Earth (82.7% good, AQI 38); Carlton (92.9% good, AQI 35); Cass (94.4% good, AQI 22); Cook (100.0% good, AQI 12).
Air Quality Summary
Good Days
88.8%
150 of 169 monitored days
13.8pp vs 75% target
Max AQI Recorded
108
USG
Health Grade
Good
90th-pct AQI 51
Beltrami County, Good days share 88.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Beltrami County, Unhealthy-or-worse share 0.0%
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 169 monitored days across EPA AQI categories.
Good
150
89%
Moderate
15
9%
USG
4
2%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Beltrami County.
- Ozone · 108 days · 63.9%
- PM2.5 · 61 days · 36.1%
Health Impact Assessment
Good
Beltrami County's air quality is rated Good based on 88.8% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 88.8% of monitored days in 2025, with a median AQI of 37. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 108 of 169 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Beltrami County. Best year: 2022 (318 good 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 | 150 | 15 | 4 | 0 | 37 | 108 |
How does Beltrami County compare?
How Beltrami County compares
Good-day share better than US avg
Beltrami County 88.8%
Anoka County, Minnesota 82.1%
US average 76.5%
Median AQI better than US avg
Beltrami County 37
Anoka County, Minnesota 38
US average 38
Unhealthy days / yr about average
Beltrami County 0
Anoka County, Minnesota 1
US average 0
Other Counties in Minnesota
Air quality comparison for nearby counties in Minnesota.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Beltrami County.
Alachua County, Florida
AQI 37 · 90.1% good
Benewah County, Idaho
AQI 37 · 74.6% good
Brevard County, Florida
AQI 37 · 89.7% good
Brown County, Indiana
AQI 37 · 94.5% good
Brown County, Wisconsin
AQI 37 · 79.0% good
Caldwell County, North Carolina
AQI 37 · 96.2% good
What Beltrami County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 37 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 169 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Beltrami County, Minnesota? ▼
Beltrami County has a median Air Quality Index (AQI) of 37, rated "Good." 88.8% of monitored days (150 out of 169) had good air quality in 2025.
What is the main pollutant in Beltrami County? ▼
The primary pollutant in Beltrami County is Ozone (O3), which was the main AQI driver on 108 days (64% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Beltrami County have? ▼
In 2025, Beltrami County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 108.
Is the air quality in Beltrami County getting better or worse? ▼
Air quality in Beltrami County is worsening based on 5-year trends (2020-2025). Best year: 2022 with 318 good days. Worst year: 2025 with 150 good days.
What does AQI 37 mean for health? ▼
Beltrami County's median AQI of 37 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Beltrami County compare to other counties in Minnesota? ▼
Beltrami County has 88.8% good air days. Nearby counties in Minnesota: Anoka (82.1% good), Becker (84.7% good), Blue Earth (82.7% good), Carlton (92.9% good), Cass (94.4% good), Cook (100.0% good).
What is the 90th percentile AQI in Beltrami County? ▼
The 90th percentile AQI for Beltrami County is 51, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 108 (USG).
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.
Every figure on PlainAir 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.