Median AQI
38
Good
Minnesota · County air quality · 2025
Anoka County, Minnesota
Median AQI 38 (Good). 74.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 38
- Median AQI
- 74.1%
- Good-air days
- 4
- Unhealthy days
- 42%
- Cleaner than US counties
Anoka County's 2025 annual median AQI is 38 (Good), with 74.1% Good days
According to the U.S. EPA Air Quality System, Anoka County, Minnesota posted a 2025 median AQI of 38 (Good) across 363 monitored days, with 74.1% rated Good and 4 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Anoka County's 74.1% Good-day share places it cleaner than 42% of US counties in 2025.
- Closest median-AQI peer
- Adams County (94.7% Good, median AQI 38) is the closest nationwide median-AQI peer to Anoka County.
- 2020–2025 trend
- Anoka County's floor-qualifying Good-day share is worsening from 2020 to 2025 (79.0% → 74.1%).
- Median AQI
- Median AQI: 38
The verdict
According to EPA Air Quality System monitoring data, Anoka County's air is good on balance, more polluted than the median US county, a median AQI of 38 with 74.1% of 363 monitored days in the Good band, driven mainly by Ozone.
- 38
- median AQI · Good
- 74.1%
- days rated Good
- Ozone
- main pollutant
- 42%
- cleaner than US counties
4 days reached Unhealthy or worse; the worst single reading hit AQI 177.
Annual release change
What changed in the 2025 EPA annual release
- Anoka County's peak single-day AQI rose from 125 to 177 between the 2024 and 2025 EPA annual releases, a change of +52 points.
- Anoka County's Good-day share fell from 78.1% to 74.1% between the 2024 and 2025 EPA annual releases, a change of -4.0 percentage points.
- Anoka County's Unhealthy-category days rose from 0 to 4 between the 2024 and 2025 EPA annual releases, a change of +4 days.
- Anoka County's median AQI fell from 41 to 38 between the 2024 and 2025 EPA annual releases, a change of -3 points.
Data updated August 2026
- Good · 269 d · 74.1%
- Moderate · 85 d · 23.4%
- USG · 5 d · 1.4%
- Unhealthy · 4 d · 1.1%
How did Anoka County's air break down in 2025?
Across 363 monitored days, 269 fell in the Good band (AQI 0–50) and 4 reached Unhealthy or worse. The worst single day peaked at AQI 177 (Unhealthy).
EPA AQS →Air quality data from EPA Air Quality System (2025). 363 days monitored. Median AQI: 38 (Good).
Insights: Anoka County, Minnesota. EPA monitors recorded a median Air Quality Index of 38 across 363 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 269 (74%) fell in the Good band (AQI 0–50), 85 (23%) registered Moderate readings, and 5 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 64, while the worst single-day peak hit 177 (Unhealthy). Residents averaged about 22.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (204 days), PM2.5 (151 days), NO2 (8 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -4.9 points and the median AQI moved +0 points, placing the multi-year trajectory at worsening. The annual record contains 4 days at Unhealthy or worse. On those days, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Becker (74.0% good, AQI 38); Beltrami (79.1% good, AQI 36); 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
74.1%
269 of 363 monitored days
-0.9pp vs 75% target
Max AQI Recorded
177
Unhealthy
Health Grade
Moderate
90th-pct AQI 64
Anoka County, Good days share 74.1%
National avg
Share of monitored days at AQI 0-50 (Good band).
Anoka County, Unhealthy-or-worse share 11.0%
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 363 monitored days across EPA AQI categories.
Good
269
74%
Moderate
85
23%
USG
5
1%
Unhealthy
4
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 · 204 days · 56.2%
- PM2.5 · 151 days · 41.6%
- NO₂ · 8 days · 2.2%
Health Impact Assessment
Moderate
Anoka County's air quality is rated Moderate based on 74.1% good air days. There were 4 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 5 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 177. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is Ozone, driving AQI on 204 of 363 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Anoka County. Highest Good-day share: 2022 (79.2%, 289 of 365 monitored 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 | 269 | 85 | 5 | 4 | 38 | 177 |
How does Anoka County compare?
How Anoka County compares
Good-day share worse than typical
Anoka County 74.1%
Adams County, Illinois 94.7%
Typical US county 76.0%
Median AQI better than typical
Anoka County 38
Adams County, Illinois 38
Typical US county 39
Unhealthy days / yr worse than typical
Anoka County 4
Adams County, Illinois 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Anoka County (38), not geographic neighbors.
Adams County, Illinois
Median AQI 38 · 94.7% Good-day share
Albemarle County, Virginia
Median AQI 38 · 81.0% Good-day share
Alexander County, North Carolina
Median AQI 38 · 93.5% Good-day share
Amador County, California
Median AQI 38 · 87.4% Good-day share
Avery County, North Carolina
Median AQI 38 · 92.3% Good-day share
Becker County, Minnesota
Median AQI 38 · 74.0% Good-day share
Same primary pollutant: Ozone
Ozone 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).
Love County, Oklahoma
74.1% Good-day share · median AQI 44
Ada County, Idaho
74.0% Good-day share · median AQI 42
Lackawanna County, Pennsylvania
74.0% Good-day share · median AQI 39
Hunterdon County, New Jersey
74.2% Good-day share · median AQI 41
Campbell County, Wyoming
74.3% Good-day share · median AQI 44
Centre County, Pennsylvania
74.3% Good-day share · median AQI 41
Minnesota counties on the map
Geographic containment only, other monitored counties in Minnesota, independent of AQI or pollutant match.
What Anoka County's air means for you
On most days the air here is fine, but Ozone drives 4 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-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 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 Anoka County, Minnesota? ▼
Anoka County has a median Air Quality Index (AQI) of 38, rated "Good." 74.1% of monitored days (269 out of 363) 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 204 days (56% 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 4 unhealthy air days (4 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 177.
Is the air quality in Anoka County getting better or worse? ▼
Air quality in Anoka 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 79.2% (289 of 365 days). Lowest qualifying Good-day share: 2023 at 59.5% (217 of 365 days).
What does AQI 38 mean for health? ▼
Anoka County's median AQI of 38 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Anoka County compare to other counties in Minnesota? ▼
Anoka County has 74.1% good air days. Nearby counties in Minnesota: Becker (74.0% good), Beltrami (79.1% 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 Anoka County? ▼
The 90th percentile AQI for Anoka County is 64, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 177 (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 Anoka 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.