Median AQI
38
Good
Michigan · County air quality · 2025
Genesee County, Michigan
Median AQI 38 (Good). 83.2% of monitored days rated Good, direct from EPA Air Quality System stations.
- 38
- Median AQI
- 83.2%
- Good-air days
- 0
- Unhealthy days
- 61%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Genesee County's air is good on balance, cleaner than the median US county, a median AQI of 38 with 83.2% of 303 monitored days in the Good band, driven mainly by Ozone.
- 38
- median AQI · Good
- 83.2%
- days rated Good
- Ozone
- main pollutant
- 61%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 126.
Data updated July 2026
- Good · 252 d · 83.2%
- Moderate · 48 d · 15.8%
- USG · 3 d · 1.0%
How did Genesee County's air break down in 2025?
Across 303 monitored days, 252 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 126 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 303 days monitored. Median AQI: 38 (Good).
Insights: Genesee County, Michigan. EPA monitors recorded a median Air Quality Index of 38 across 303 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 252 (83%) fell in the Good band (AQI 0–50), 48 (16%) registered Moderate readings, and 3 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 57, while the worst single-day peak hit 126 (USG). Residents averaged about 25.0 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (220 days), PM2.5 (83 days). Across the 2020–2025 trend window, good days shifted by -36 and the median AQI moved -1 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 126, usg but never Unhealthy. Nearby counties show comparable readings: Allegan (71.2% good, AQI 43); Bay (71.8% good, AQI 38); 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
83.2%
252 of 303 monitored days
8.2pp vs 75% target
Max AQI Recorded
126
USG
Health Grade
Good
90th-pct AQI 57
Genesee County, Good days share 83.2%
National avg
Share of monitored days at AQI 0-50 (Good band).
Genesee 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 303 monitored days across EPA AQI categories.
Good
252
83%
Moderate
48
16%
USG
3
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 Genesee County.
- Ozone · 220 days · 72.6%
- PM2.5 · 83 days · 27.4%
Health Impact Assessment
Good
Genesee County's air quality is rated Good based on 83.2% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 83.2% of monitored days in 2025, with a median AQI of 38. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 220 of 303 monitored days.
5-Year Air Quality Trend
Air quality is improving in Genesee County. Best year: 2020 (288 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 288 | 77 | 1 | 0 | 39 | 126 |
| 2021 | 247 | 115 | 3 | 0 | 41 | 119 |
| 2022 | 237 | 125 | 2 | 0 | 44 | 112 |
| 2023 | 238 | 115 | 8 | 3 | 44 | 178 |
| 2024 | 252 | 94 | 1 | 0 | 42 | 119 |
| 2025 | 252 | 48 | 3 | 0 | 38 | 126 |
How does Genesee County compare?
How Genesee County compares
Good-day share better than US avg
Genesee County 83.2%
Allegan County, Michigan 71.2%
US average 76.5%
Median AQI about average
Genesee County 38
Allegan County, Michigan 43
US average 38
Unhealthy days / yr about average
Genesee County 0
Allegan County, Michigan 1
US average 0
Other Counties in Michigan
Air quality comparison for nearby counties in Michigan.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Genesee County.
Adams County, Illinois
AQI 38 · 94.4% good
Anoka County, Minnesota
AQI 38 · 82.1% 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
What Genesee 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 38 means for exposure. Health guidance
- See how Genesee County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Genesee County with its Michigan neighbours before drawing a conclusion about the region. All of Michigan
Based on 303 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 Genesee County, Michigan? ▼
Genesee County has a median Air Quality Index (AQI) of 38, rated "Good." 83.2% of monitored days (252 out of 303) had good air quality in 2025.
What is the main pollutant in Genesee County? ▼
The primary pollutant in Genesee County is Ozone (O3), which was the main AQI driver on 220 days (73% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Genesee County have? ▼
In 2025, Genesee County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 126.
Is the air quality in Genesee County getting better or worse? ▼
Air quality in Genesee County is improving based on 5-year trends (2020-2025). Best year: 2020 with 288 good days. Worst year: 2022 with 237 good days.
What does AQI 38 mean for health? ▼
Genesee 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 Genesee County compare to other counties in Michigan? ▼
Genesee County has 83.2% good air days. Nearby counties in Michigan: Allegan (71.2% good), Bay (71.8% good), Benzie (91.1% good), Berrien (80.9% good), Cass (85.3% good), Clinton (90.2% good).
What is the 90th percentile AQI in Genesee County? ▼
The 90th percentile AQI for Genesee County is 57, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 126 (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.