Median AQI
42
Good
Ohio · County air quality · 2025
Geauga County, Ohio
Median AQI 42 (Good). 82.9% of monitored days rated Good, direct from EPA Air Quality System stations.
- 42
- Median AQI
- 82.9%
- Good-air days
- 0
- Unhealthy days
- 60%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Geauga County's air is good on balance, cleaner than the median US county, a median AQI of 42 with 82.9% of 245 monitored days in the Good band, driven mainly by Ozone.
- 42
- median AQI · Good
- 82.9%
- days rated Good
- Ozone
- main pollutant
- 60%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 129.
Data updated July 2026
- Good · 203 d · 82.9%
- Moderate · 41 d · 16.7%
- USG · 1 d · 0.4%
How did Geauga County's air break down in 2025?
Across 245 monitored days, 203 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 129 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 245 days monitored. Median AQI: 42 (Good).
Insights: Geauga County, Ohio. EPA monitors recorded a median Air Quality Index of 42 across 245 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 203 (83%) fell in the Good band (AQI 0–50), 41 (17%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 61, while the worst single-day peak hit 129 (USG). Residents averaged about 24.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (245 days). Across the 2020–2025 trend window, good days shifted by -11 and the median AQI moved +1 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 129, usg but never Unhealthy. Nearby counties show comparable readings: Allen (65.9% good, AQI 43); Ashtabula (81.2% good, AQI 43); Athens (80.3% good, AQI 33); Belmont (63.0% good, AQI 42); Butler (33.3% good, AQI 55); Clark (59.4% good, AQI 46).
Air Quality Summary
Good Days
82.9%
203 of 245 monitored days
7.9pp vs 75% target
Max AQI Recorded
129
USG
Health Grade
Good
90th-pct AQI 61
Geauga County, Good days share 82.9%
National avg
Share of monitored days at AQI 0-50 (Good band).
Geauga 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 245 monitored days across EPA AQI categories.
Good
203
83%
Moderate
41
17%
USG
1
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Geauga County.
- Ozone · 245 days · 100.0%
Health Impact Assessment
Good
Geauga County's air quality is rated Good based on 82.9% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 82.9% of monitored days in 2025, with a median AQI of 42. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 245 of 245 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Geauga County. Best year: 2020 (214 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 214 | 31 | 0 | 0 | 41 | 100 |
| 2021 | 176 | 40 | 0 | 0 | 41 | 97 |
| 2022 | 210 | 27 | 2 | 0 | 40 | 119 |
| 2023 | 212 | 32 | 1 | 0 | 41 | 129 |
| 2024 | 196 | 43 | 1 | 0 | 41 | 101 |
| 2025 | 203 | 41 | 1 | 0 | 42 | 129 |
How does Geauga County compare?
How Geauga County compares
Good-day share better than US avg
Geauga County 82.9%
Allen County, Ohio 65.9%
US average 76.5%
Median AQI worse than US avg
Geauga County 42
Allen County, Ohio 43
US average 38
Unhealthy days / yr about average
Geauga County 0
Allen County, Ohio 0
US average 0
Other Counties in Ohio
Air quality comparison for nearby counties in Ohio.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Geauga County.
Adams County, Pennsylvania
AQI 42 · 73.8% good
Anderson County, Tennessee
AQI 42 · 91.0% good
Andrew County, Missouri
AQI 42 · 84.3% good
Armstrong County, Pennsylvania
AQI 42 · 68.1% good
Baldwin County, Alabama
AQI 42 · 72.2% good
Belmont County, Ohio
AQI 42 · 63.0% good
What Geauga 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 42 means for exposure. Health guidance
- See how Geauga County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Geauga County with its Ohio neighbours before drawing a conclusion about the region. All of Ohio
Based on 245 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 Geauga County, Ohio? ▼
Geauga County has a median Air Quality Index (AQI) of 42, rated "Good." 82.9% of monitored days (203 out of 245) had good air quality in 2025.
What is the main pollutant in Geauga County? ▼
The primary pollutant in Geauga County is Ozone (O3), which was the main AQI driver on 245 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Geauga County have? ▼
In 2025, Geauga County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 129.
Is the air quality in Geauga County getting better or worse? ▼
Air quality in Geauga County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 214 good days. Worst year: 2021 with 176 good days.
What does AQI 42 mean for health? ▼
Geauga County's median AQI of 42 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 Geauga County compare to other counties in Ohio? ▼
Geauga County has 82.9% good air days. Nearby counties in Ohio: Allen (65.9% good), Ashtabula (81.2% good), Athens (80.3% good), Belmont (63.0% good), Butler (33.3% good), Clark (59.4% good).
What is the 90th percentile AQI in Geauga County? ▼
The 90th percentile AQI for Geauga County is 61, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 129 (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.