Median AQI
35
Good
Michigan · County air quality · 2025
Missaukee County, Michigan
Median AQI 35 (Good). 86.9% of monitored days rated Good, direct from EPA Air Quality System stations.
- 35
- Median AQI
- 86.9%
- Good-air days
- 0
- Unhealthy days
- 74%
- Cleaner than US counties
Missaukee County's 2025 annual median AQI is 35 (Good), with 86.9% Good days
According to the U.S. EPA Air Quality System, Missaukee County, Michigan posted a 2025 median AQI of 35 (Good) across 360 monitored days, with 86.9% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Missaukee County's 86.9% Good-day share places it cleaner than 74% of US counties in 2025.
- Closest median-AQI peer
- Atascosa County (76.0% Good, median AQI 35) is the closest nationwide median-AQI peer to Missaukee County.
- 2020–2025 trend
- Missaukee County's floor-qualifying Good-day share is improving from 2020 to 2025 (67.9% → 86.9%).
- Median AQI
- Median AQI: 35
The verdict
According to EPA Air Quality System monitoring data, Missaukee County's air is good on balance, cleaner than the median US county, a median AQI of 35 with 86.9% of 360 monitored days in the Good band, driven mainly by Ozone.
- 35
- median AQI · Good
- 86.9%
- days rated Good
- Ozone
- main pollutant
- 74%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 133.
Annual release change
What changed in the 2025 EPA annual release
- Missaukee County's Good-day share fell from 92.3% to 86.9% between the 2024 and 2025 EPA annual releases, a change of -5.4 percentage points.
- Missaukee County's peak single-day AQI rose from 84 to 133 between the 2024 and 2025 EPA annual releases, a change of +49 points.
Data updated August 2026
- Good · 313 d · 86.9%
- Moderate · 43 d · 11.9%
- USG · 4 d · 1.1%
How did Missaukee County's air break down in 2025?
Across 360 monitored days, 313 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 133 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 360 days monitored. Median AQI: 35 (Good).
Insights: Missaukee County, Michigan. EPA monitors recorded a median Air Quality Index of 35 across 360 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 313 (87%) fell in the Good band (AQI 0–50), 43 (12%) registered Moderate readings, and 4 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 58, while the worst single-day peak hit 133 (USG). Residents averaged about 26.1 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (253 days), PM2.5 (105 days), NO2 (2 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +19.0 points and the median AQI moved -6 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 133, usg but never Unhealthy. Nearby counties show comparable readings: Allegan (63.9% good, AQI 44); Bay (70.4% good, AQI 39); Benzie (91.1% good, AQI 35); Berrien (80.9% good, AQI 41); Cass (85.3% good, AQI 40); Clinton (90.2% good, AQI 39).
Air Quality Summary
Good Days
86.9%
313 of 360 monitored days
11.9pp vs 75% target
Max AQI Recorded
133
USG
Health Grade
Good
90th-pct AQI 58
Missaukee County, Good days share 86.9%
National avg
Share of monitored days at AQI 0-50 (Good band).
Missaukee 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 360 monitored days across EPA AQI categories.
Good
313
87%
Moderate
43
12%
USG
4
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Missaukee County.
- Ozone · 253 days · 70.3%
- PM2.5 · 105 days · 29.2%
- NO₂ · 2 days · 0.6%
Health Impact Assessment
Good
Missaukee County's air quality is rated Good based on 86.9% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 86.9% of monitored days in 2025, with a median AQI of 35. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 253 of 360 monitored days.
5-Year Air Quality Trend
Air quality is improving in Missaukee County. Highest Good-day share: 2024 (92.3%, 337 of 365 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 248 | 116 | 1 | 0 | 41 | 105 |
| 2021 | 216 | 139 | 0 | 0 | 45 | 90 |
| 2022 | 228 | 134 | 1 | 0 | 46 | 108 |
| 2023 | 203 | 153 | 4 | 1 | 48 | 201 |
| 2024 | 337 | 28 | 0 | 0 | 35 | 84 |
| 2025 | 313 | 43 | 4 | 0 | 35 | 133 |
How does Missaukee County compare?
How Missaukee County compares
Good-day share better than US avg
Missaukee County 86.9%
Atascosa County, Texas 76.0%
US average 76.0%
Median AQI better than US avg
Missaukee County 35
Atascosa County, Texas 35
US average 39
Unhealthy days / yr better than US avg
Missaukee County 0
Atascosa County, Texas 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Missaukee County (35), not geographic neighbors.
Atascosa County, Texas
Median AQI 35 · 76.0% Good-day share
Benzie County, Michigan
Median AQI 35 · 91.1% Good-day share
Berkeley County, South Carolina
Median AQI 35 · 93.3% Good-day share
Boone County, Indiana
Median AQI 35 · 89.7% Good-day share
Brazoria County, Texas
Median AQI 35 · 80.8% Good-day share
Caroline County, Virginia
Median AQI 35 · 96.7% 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).
Andrew County, Missouri
86.9% Good-day share · median AQI 40
Tuolumne County, California
87.0% Good-day share · median AQI 39
St. Tammany County, Louisiana
86.8% Good-day share · median AQI 37
Garrett County, Maryland
87.1% Good-day share · median AQI 39
Bremer County, Iowa
87.1% Good-day share · median AQI 38
Custer County, Montana
87.2% Good-day share · median AQI 40
Michigan counties on the map
Geographic containment only, other monitored counties in Michigan, independent of AQI or pollutant match.
What Missaukee 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 35 means for exposure. Health guidance
- See how Missaukee County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Missaukee County with its Michigan neighbours before drawing a conclusion about the region. All of Michigan
Based on 360 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 Missaukee County, Michigan? ▼
Missaukee County has a median Air Quality Index (AQI) of 35, rated "Good." 86.9% of monitored days (313 out of 360) had good air quality in 2025.
What is the main pollutant in Missaukee County? ▼
The primary pollutant in Missaukee County is Ozone (O3), which was the main AQI driver on 253 days (70% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Missaukee County have? ▼
In 2025, Missaukee County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 133.
Is the air quality in Missaukee County getting better or worse? ▼
Air quality in Missaukee County is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 92.3% (337 of 365 days). Lowest qualifying Good-day share: 2023 at 56.2% (203 of 362 days).
What does AQI 35 mean for health? ▼
Missaukee County's median AQI of 35 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Missaukee County compare to other counties in Michigan? ▼
Missaukee County has 86.9% good air days. Nearby counties in Michigan: Allegan (63.9% good), Bay (70.4% good), Benzie (91.1% good), Berrien (80.9% good), Cass (85.3% good), Clinton (90.2% good).
What is the 90th percentile AQI in Missaukee County? ▼
The 90th percentile AQI for Missaukee County is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 133 (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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Missaukee County, Michigan · 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.