Median AQI
38
Good
Minnesota · County air quality · 2025
Anoka County, Minnesota
Median AQI 38 (Good). 82.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 38
- Median AQI
- 82.1%
- Good-air days
- 1
- Unhealthy days
- 58%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Anoka County's air is good on balance, cleaner than the median US county, a median AQI of 38 with 82.1% of 179 monitored days in the Good band, driven mainly by Ozone.
- 38
- median AQI · Good
- 82.1%
- days rated Good
- Ozone
- main pollutant
- 58%
- cleaner than US counties
1 day reached Unhealthy or worse; the worst single reading hit AQI 155.
Data updated July 2026
- Good · 147 d · 82.1%
- Moderate · 31 d · 17.3%
- Unhealthy · 1 d · 0.6%
How did Anoka County's air break down in 2025?
Across 179 monitored days, 147 fell in the Good band (AQI 0–50) and 1 reached Unhealthy or worse. The worst single day peaked at AQI 155 (Unhealthy).
EPA AQS →Air quality data from EPA Air Quality System (2025). 179 days monitored. Median AQI: 38 (Good).
Insights: Anoka County, Minnesota. EPA monitors recorded a median Air Quality Index of 38 across 179 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 147 (82%) fell in the Good band (AQI 0–50), 31 (17%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 60, while the worst single-day peak hit 155 (Unhealthy). Residents averaged about 24.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (141 days), PM2.5 (34 days), NO2 (4 days). Across the 2020–2025 trend window, good days shifted by -142 and the median AQI moved +0 points, placing the multi-year trajectory at improving. Residents and visitors experienced 1 unhealthy-or-worse days combined, periods when the EPA recommends sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Becker (84.7% good, AQI 38); Beltrami (88.8% good, AQI 37); 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
82.1%
147 of 179 monitored days
7.1pp vs 75% target
Max AQI Recorded
155
Unhealthy
Health Grade
Good
90th-pct AQI 60
Anoka County, Good days share 82.1%
National avg
Share of monitored days at AQI 0-50 (Good band).
Anoka County, Unhealthy-or-worse share 0.6%
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 179 monitored days across EPA AQI categories.
Good
147
82%
Moderate
31
17%
USG
0
0%
Unhealthy
1
1%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Anoka County.
- Ozone · 141 days · 78.8%
- PM2.5 · 34 days · 19.0%
- NO₂ · 4 days · 2.2%
Health Impact Assessment
Good
Anoka County's air quality is rated Good based on 82.1% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 0 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 155. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is Ozone, driving AQI on 141 of 179 monitored days.
5-Year Air Quality Trend
Air quality is improving in Anoka County. Best year: 2022 (289 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 289 | 77 | 0 | 0 | 38 | 87 |
| 2021 | 258 | 100 | 5 | 2 | 41 | 162 |
| 2022 | 289 | 76 | 0 | 0 | 40 | 93 |
| 2023 | 217 | 131 | 15 | 2 | 46 | 175 |
| 2024 | 286 | 79 | 1 | 0 | 41 | 125 |
| 2025 | 147 | 31 | 0 | 1 | 38 | 155 |
How does Anoka County compare?
How Anoka County compares
Good-day share better than US avg
Anoka County 82.1%
Becker County, Minnesota 84.7%
US average 76.5%
Median AQI about average
Anoka County 38
Becker County, Minnesota 38
US average 38
Unhealthy days / yr worse than US avg
Anoka County 1
Becker County, Minnesota 0
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 Anoka County.
Adams County, Illinois
AQI 38 · 94.4% good
Atlantic County, New Jersey
AQI 38 · 79.6% good
Avery County, North Carolina
AQI 38 · 93.9% good
Barnstable County, Massachusetts
AQI 38 · 92.5% good
Bay County, Michigan
AQI 38 · 71.8% good
Becker County, Minnesota
AQI 38 · 84.7% good
What Anoka County's air means for you
On most days the air here is fine, but Ozone drives 1 unhealthy-or-worse day a year that sensitive groups should plan around.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 38 means for exposure. Health guidance
- See how Anoka County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Anoka County with its Minnesota neighbours before drawing a conclusion about the region. All of Minnesota
Based on 179 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 Anoka County, Minnesota? ▼
Anoka County has a median Air Quality Index (AQI) of 38, rated "Good." 82.1% of monitored days (147 out of 179) had good air quality in 2025.
What is the main pollutant in Anoka County? ▼
The primary pollutant in Anoka County is Ozone (O3), which was the main AQI driver on 141 days (79% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Anoka County have? ▼
In 2025, Anoka County recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 155.
Is the air quality in Anoka County getting better or worse? ▼
Air quality in Anoka County is improving based on 5-year trends (2020-2025). Best year: 2022 with 289 good days. Worst year: 2025 with 147 good days.
What does AQI 38 mean for health? ▼
Anoka County's median AQI of 38 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 Anoka County compare to other counties in Minnesota? ▼
Anoka County has 82.1% good air days. Nearby counties in Minnesota: Becker (84.7% good), Beltrami (88.8% 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 Anoka County? ▼
The 90th percentile AQI for Anoka County is 60, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 155 (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.
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.