EnviroNearby

Geauga County, Ohio air quality history

Daily Air Quality Index summaries from EPA monitors in Geauga, Ohio, 1997–2025.

83%
Good days in 2025
42
Median daily AQI, 2025
1
Days above 100 in 2025
245
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Geauga, Ohio on 245 days. 203 of those days (83%) were in the Good range, and the median daily AQI was 42. That median is about the same as the typical monitored county in Ohio (median 43 across 36 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was ozone on 245 days. Across the years with fuller monitoring, the share of Good days rose: an average of 61% in 1997–1999 versus 84% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (245 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%1997: Good 134 of 213 days1997: Moderate 50 of 213 days1997: Unhealthy for Sensitive Groups 20 of 213 days1997: Unhealthy 8 of 213 days1997: Very Unhealthy 1 of 213 days19971998: Good 129 of 214 days1998: Moderate 60 of 214 days1998: Unhealthy for Sensitive Groups 19 of 214 days1998: Unhealthy 5 of 214 days1998: Very Unhealthy 1 of 214 days1999: Good 125 of 212 days1999: Moderate 54 of 212 days1999: Unhealthy for Sensitive Groups 22 of 212 days1999: Unhealthy 10 of 212 days1999: Very Unhealthy 1 of 212 days2000: Good 145 of 213 days2000: Moderate 52 of 213 days2000: Unhealthy for Sensitive Groups 13 of 213 days2000: Unhealthy 3 of 213 days2001: Good 119 of 214 days2001: Moderate 54 of 214 days2001: Unhealthy for Sensitive Groups 20 of 214 days2001: Unhealthy 21 of 214 days2002: Good 107 of 213 days2002: Moderate 59 of 213 days2002: Unhealthy for Sensitive Groups 21 of 213 days2002: Unhealthy 17 of 213 days2002: Very Unhealthy 9 of 213 days20022003: Good 119 of 204 days2003: Moderate 65 of 204 days2003: Unhealthy for Sensitive Groups 13 of 204 days2003: Unhealthy 5 of 204 days2003: Very Unhealthy 2 of 204 days2004: Good 159 of 213 days2004: Moderate 42 of 213 days2004: Unhealthy for Sensitive Groups 11 of 213 days2004: Unhealthy 1 of 213 days2005: Good 107 of 206 days2005: Moderate 63 of 206 days2005: Unhealthy for Sensitive Groups 30 of 206 days2005: Unhealthy 6 of 206 days2006: Good 174 of 214 days2006: Moderate 37 of 214 days2006: Unhealthy for Sensitive Groups 3 of 214 days2007: Good 178 of 214 days2007: Moderate 35 of 214 days2007: Unhealthy for Sensitive Groups 1 of 214 days20072008: Good 154 of 214 days2008: Moderate 47 of 214 days2008: Unhealthy for Sensitive Groups 12 of 214 days2008: Unhealthy 1 of 214 days2009: Good 175 of 211 days2009: Moderate 33 of 211 days2009: Unhealthy for Sensitive Groups 3 of 211 days2010: Good 138 of 214 days2010: Moderate 68 of 214 days2010: Unhealthy for Sensitive Groups 7 of 214 days2010: Unhealthy 1 of 214 days2011: Good 171 of 213 days2011: Moderate 38 of 213 days2011: Unhealthy for Sensitive Groups 4 of 213 days2012: Good 130 of 214 days2012: Moderate 66 of 214 days2012: Unhealthy for Sensitive Groups 16 of 214 days2012: Unhealthy 2 of 214 days20122013: Good 182 of 214 days2013: Moderate 31 of 214 days2013: Unhealthy for Sensitive Groups 1 of 214 days2014: Good 176 of 214 days2014: Moderate 37 of 214 days2014: Unhealthy for Sensitive Groups 1 of 214 days2015: Good 164 of 214 days2015: Moderate 43 of 214 days2015: Unhealthy for Sensitive Groups 7 of 214 days2016: Good 155 of 214 days2016: Moderate 49 of 214 days2016: Unhealthy for Sensitive Groups 10 of 214 days2017: Good 192 of 245 days2017: Moderate 49 of 245 days2017: Unhealthy for Sensitive Groups 4 of 245 days20172018: Good 196 of 245 days2018: Moderate 40 of 245 days2018: Unhealthy for Sensitive Groups 9 of 245 days2019: Good 189 of 230 days2019: Moderate 39 of 230 days2019: Unhealthy for Sensitive Groups 2 of 230 days2020: Good 214 of 245 days2020: Moderate 31 of 245 days2021: Good 176 of 216 days2021: Moderate 40 of 216 days2022: Good 210 of 239 days2022: Moderate 27 of 239 days2022: Unhealthy for Sensitive Groups 2 of 239 days20222023: Good 212 of 245 days2023: Moderate 32 of 245 days2023: Unhealthy for Sensitive Groups 1 of 245 days2024: Good 196 of 240 days2024: Moderate 43 of 240 days2024: Unhealthy for Sensitive Groups 1 of 240 days2025: Good 203 of 245 days2025: Moderate 41 of 245 days2025: Unhealthy for Sensitive Groups 1 of 245 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501001502001997: 90th percentile AQI 1051998: 90th percentile AQI 1151999: 90th percentile AQI 1262000: 90th percentile AQI 972001: 90th percentile AQI 1472002: 90th percentile AQI 1612003: 90th percentile AQI 1002004: 90th percentile AQI 902005: 90th percentile AQI 1152006: 90th percentile AQI 672007: 90th percentile AQI 642008: 90th percentile AQI 842009: 90th percentile AQI 582010: 90th percentile AQI 842011: 90th percentile AQI 672012: 90th percentile AQI 972013: 90th percentile AQI 542014: 90th percentile AQI 612015: 90th percentile AQI 842016: 90th percentile AQI 742017: 90th percentile AQI 672018: 90th percentile AQI 772019: 90th percentile AQI 612020: 90th percentile AQI 612021: 90th percentile AQI 712022: 90th percentile AQI 542023: 90th percentile AQI 582024: 90th percentile AQI 642025: 90th percentile AQI 611997: Median AQI 451998: Median AQI 451999: Median AQI 442000: Median AQI 452001: Median AQI 482002: Median AQI 502003: Median AQI 482004: Median AQI 432005: Median AQI 492006: Median AQI 412007: Median AQI 382008: Median AQI 442009: Median AQI 392010: Median AQI 462011: Median AQI 412012: Median AQI 472013: Median AQI 392014: Median AQI 412015: Median AQI 442016: Median AQI 442017: Median AQI 432018: Median AQI 422019: Median AQI 422020: Median AQI 412021: Median AQI 412022: Median AQI 402023: Median AQI 412024: Median AQI 412025: Median AQI 421997200220072012201720222025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Ozone245100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20252452034110004261129Ozone
20242401964310004164101Ozone
20232452123210004158129Ozone
20222392102720004054119Ozone
2021216176400000417197Ozone
20202452143100004161100Ozone
20192301893920004261119Ozone
20182451964090004277129Ozone
20172451924940004367122Ozone
201621415549100004474140Ozone
20152141644370004484133Ozone
20142141763710004161122Ozone
20132141823110003954112Ozone
201221413066162004797195Ozone
20112131713840004167129Ozone
20102141386871004684154Ozone
20092111753330003958115Ozone
200821415447121004484156Ozone
20072141783510003864101Ozone
20062141743730004167119Ozone
2005206107633060049115164Ozone
200421315942111004390154Ozone
2003204119651352048100216Ozone
20022131075921179050161218Ozone
20012141195420210048147192Ozone
200021314552133004597190Ozone
19992121255422101044126202Ozone
1998214129601951045115204Ozone
1997213134502081045105203Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Ohio with a similar median AQI in 2025

All monitored counties in Ohio

Source: U.S. EPA AirData, “Annual AQI by County” files for 1997–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem