EnviroNearby

Medina County, Ohio air quality history

Daily Air Quality Index summaries from EPA monitors in Medina, Ohio, 1980–2025.

69%
Good days in 2025
43
Median daily AQI, 2025
2
Days above 100 in 2025
361
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Medina, Ohio on 361 days. 249 of those days (69%) were in the Good range, and the median daily AQI was 43. That median is about the same as the typical monitored county in Ohio (median 43 across 36 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 187 days. Across the years with fuller monitoring, the share of Good days fell: an average of 86% in 1980–1982 versus 65% in 2023–2025.

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%1980: Good 311 of 361 days1980: Moderate 33 of 361 days1980: Unhealthy for Sensitive Groups 17 of 361 days19801981: Good 274 of 330 days1981: Moderate 41 of 330 days1981: Unhealthy for Sensitive Groups 10 of 330 days1981: Unhealthy 5 of 330 days1982: Good 302 of 341 days1982: Moderate 31 of 341 days1982: Unhealthy for Sensitive Groups 6 of 341 days1982: Unhealthy 2 of 341 days1983: Good 254 of 330 days1983: Moderate 50 of 330 days1983: Unhealthy for Sensitive Groups 21 of 330 days1983: Unhealthy 5 of 330 days1984: Good 292 of 358 days1984: Moderate 46 of 358 days1984: Unhealthy for Sensitive Groups 15 of 358 days1984: Unhealthy 5 of 358 days1985: Good 280 of 355 days1985: Moderate 61 of 355 days1985: Unhealthy for Sensitive Groups 11 of 355 days1985: Unhealthy 3 of 355 days19851986: Good 227 of 302 days1986: Moderate 55 of 302 days1986: Unhealthy for Sensitive Groups 18 of 302 days1986: Unhealthy 2 of 302 days1987: Good 143 of 200 days1987: Moderate 39 of 200 days1987: Unhealthy for Sensitive Groups 14 of 200 days1987: Unhealthy 4 of 200 days1988: Good 128 of 211 days1988: Moderate 38 of 211 days1988: Unhealthy for Sensitive Groups 23 of 211 days1988: Unhealthy 17 of 211 days1988: Very Unhealthy 5 of 211 days1989: Good 139 of 204 days1989: Moderate 39 of 204 days1989: Unhealthy for Sensitive Groups 17 of 204 days1989: Unhealthy 9 of 204 days1990: Good 157 of 208 days1990: Moderate 35 of 208 days1990: Unhealthy for Sensitive Groups 15 of 208 days1990: Unhealthy 1 of 208 days19901991: Good 107 of 193 days1991: Moderate 41 of 193 days1991: Unhealthy for Sensitive Groups 26 of 193 days1991: Unhealthy 18 of 193 days1991: Very Unhealthy 1 of 193 days1992: Good 169 of 212 days1992: Moderate 32 of 212 days1992: Unhealthy for Sensitive Groups 10 of 212 days1992: Unhealthy 1 of 212 days1993: Good 127 of 214 days1993: Moderate 55 of 214 days1993: Unhealthy for Sensitive Groups 24 of 214 days1993: Unhealthy 7 of 214 days1993: Very Unhealthy 1 of 214 days1994: Good 126 of 213 days1994: Moderate 52 of 213 days1994: Unhealthy for Sensitive Groups 30 of 213 days1994: Unhealthy 4 of 213 days1994: Very Unhealthy 1 of 213 days1995: Good 114 of 204 days1995: Moderate 62 of 204 days1995: Unhealthy for Sensitive Groups 21 of 204 days1995: Unhealthy 7 of 204 days19951996: Good 133 of 211 days1996: Moderate 52 of 211 days1996: Unhealthy for Sensitive Groups 20 of 211 days1996: Unhealthy 6 of 211 days1997: Good 138 of 212 days1997: Moderate 52 of 212 days1997: Unhealthy for Sensitive Groups 18 of 212 days1997: Unhealthy 4 of 212 days1998: Good 118 of 213 days1998: Moderate 61 of 213 days1998: Unhealthy for Sensitive Groups 26 of 213 days1998: Unhealthy 8 of 213 days1999: Good 140 of 213 days1999: Moderate 51 of 213 days1999: Unhealthy for Sensitive Groups 16 of 213 days1999: Unhealthy 6 of 213 days2000: Good 156 of 213 days2000: Moderate 48 of 213 days2000: Unhealthy for Sensitive Groups 7 of 213 days2000: Unhealthy 2 of 213 days20002001: Good 129 of 214 days2001: Moderate 57 of 214 days2001: Unhealthy for Sensitive Groups 21 of 214 days2001: Unhealthy 7 of 214 days2002: Good 134 of 214 days2002: Moderate 41 of 214 days2002: Unhealthy for Sensitive Groups 25 of 214 days2002: Unhealthy 14 of 214 days2003: Good 140 of 212 days2003: Moderate 59 of 212 days2003: Unhealthy for Sensitive Groups 9 of 212 days2003: Unhealthy 4 of 212 days2004: Good 162 of 208 days2004: Moderate 38 of 208 days2004: Unhealthy for Sensitive Groups 8 of 208 days2005: Good 98 of 226 days2005: Moderate 98 of 226 days2005: Unhealthy for Sensitive Groups 25 of 226 days2005: Unhealthy 5 of 226 days20052006: Good 158 of 257 days2006: Moderate 93 of 257 days2006: Unhealthy for Sensitive Groups 6 of 257 days2007: Good 160 of 259 days2007: Moderate 97 of 259 days2007: Unhealthy for Sensitive Groups 2 of 259 days2008: Good 146 of 257 days2008: Moderate 101 of 257 days2008: Unhealthy for Sensitive Groups 10 of 257 days2009: Good 167 of 304 days2009: Moderate 135 of 304 days2009: Unhealthy for Sensitive Groups 2 of 304 days2010: Good 185 of 324 days2010: Moderate 133 of 324 days2010: Unhealthy for Sensitive Groups 5 of 324 days2010: Unhealthy 1 of 324 days20102011: Good 175 of 283 days2011: Moderate 105 of 283 days2011: Unhealthy for Sensitive Groups 3 of 283 days2012: Good 160 of 295 days2012: Moderate 124 of 295 days2012: Unhealthy for Sensitive Groups 10 of 295 days2012: Unhealthy 1 of 295 days2013: Good 200 of 257 days2013: Moderate 57 of 257 days2014: Good 199 of 261 days2014: Moderate 61 of 261 days2014: Unhealthy for Sensitive Groups 1 of 261 days2015: Good 129 of 354 days2015: Moderate 225 of 354 days20152016: Good 234 of 362 days2016: Moderate 127 of 362 days2016: Unhealthy for Sensitive Groups 1 of 362 days2017: Good 240 of 364 days2017: Moderate 124 of 364 days2018: Good 240 of 365 days2018: Moderate 125 of 365 days2019: Good 230 of 353 days2019: Moderate 123 of 353 days2020: Good 280 of 360 days2020: Moderate 80 of 360 days20202021: Good 250 of 363 days2021: Moderate 113 of 363 days2022: Good 284 of 362 days2022: Moderate 76 of 362 days2022: Unhealthy for Sensitive Groups 2 of 362 days2023: Good 228 of 363 days2023: Moderate 125 of 363 days2023: Unhealthy for Sensitive Groups 7 of 363 days2023: Unhealthy 2 of 363 days2023: Very Unhealthy 1 of 363 days2024: Good 236 of 366 days2024: Moderate 130 of 366 days2025: Good 249 of 361 days2025: Moderate 110 of 361 days2025: Unhealthy for Sensitive Groups 2 of 361 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 year0501001502001980: 90th percentile AQI 641981: 90th percentile AQI 741982: 90th percentile AQI 611983: 90th percentile AQI 931984: 90th percentile AQI 801985: 90th percentile AQI 801986: 90th percentile AQI 901987: 90th percentile AQI 1001988: 90th percentile AQI 1511989: 90th percentile AQI 1081990: 90th percentile AQI 931991: 90th percentile AQI 1501992: 90th percentile AQI 671993: 90th percentile AQI 1151994: 90th percentile AQI 1081995: 90th percentile AQI 1221996: 90th percentile AQI 1051997: 90th percentile AQI 1011998: 90th percentile AQI 1121999: 90th percentile AQI 1012000: 90th percentile AQI 802001: 90th percentile AQI 1122002: 90th percentile AQI 1292003: 90th percentile AQI 902004: 90th percentile AQI 842005: 90th percentile AQI 1072006: 90th percentile AQI 772007: 90th percentile AQI 712008: 90th percentile AQI 802009: 90th percentile AQI 682010: 90th percentile AQI 802011: 90th percentile AQI 732012: 90th percentile AQI 802013: 90th percentile AQI 602014: 90th percentile AQI 612015: 90th percentile AQI 702016: 90th percentile AQI 622017: 90th percentile AQI 612018: 90th percentile AQI 632019: 90th percentile AQI 582020: 90th percentile AQI 562021: 90th percentile AQI 622022: 90th percentile AQI 582023: 90th percentile AQI 722024: 90th percentile AQI 632025: 90th percentile AQI 671980: Median AQI 271981: Median AQI 291982: Median AQI 281983: Median AQI 321984: Median AQI 311985: Median AQI 341986: Median AQI 371987: Median AQI 391988: Median AQI 441989: Median AQI 411990: Median AQI 411991: Median AQI 491992: Median AQI 391993: Median AQI 471994: Median AQI 461995: Median AQI 471996: Median AQI 441997: Median AQI 441998: Median AQI 491999: Median AQI 442000: Median AQI 432001: Median AQI 452002: Median AQI 442003: Median AQI 452004: Median AQI 422005: Median AQI 552006: Median AQI 452007: Median AQI 422008: Median AQI 482009: Median AQI 472010: Median AQI 482011: Median AQI 462012: Median AQI 482013: Median AQI 412014: Median AQI 412015: Median AQI 542016: Median AQI 442017: Median AQI 442018: Median AQI 422019: Median AQI 442020: Median AQI 382021: Median AQI 422022: Median AQI 412023: Median AQI 442024: Median AQI 442025: Median AQI 431980198519901995200020052010201520202025
  • 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
Ozone18752%
Fine particles (PM2.5)17448%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536124911020004367126Ozone
202436623613000004463100PM2.5
202336322812572104472285PM2.5
20223622847620004158126Ozone
20213632501130000426293PM2.5
2020360280800000385693PM2.5
20193532301230000445881PM2.5
201836524012500004263100PM2.5
201736424012400004461100PM2.5
201636223412710004462105PM2.5
20153541292250000547097PM2.5
20142611996110004161105Ozone
2013257200570000416097Ozone
2012295160124101004880161Ozone
201128317510530004673129Ozone
201032418513351004880161Ozone
200930416713520004768101PM2.5
2008257146101100004880133Ozone
20072591609720004271108Ozone
20062571589360004577119Ozone
200522698982550055107190Ozone
20042081623880004284150Ozone
20032121405994004590195Ozone
20022141344125140044129179Ozone
2001214129572170045112195Ozone
20002131564872004380182Ozone
1999213140511660044101174Ozone
1998213118612680049112182Ozone
1997212138521840044101179Ozone
1996211133522060044105169Ozone
1995204114622170047122185Ozone
1994213126523041046108203Ozone
1993214127552471047115203Ozone
199221216932101003967151Ozone
19911931074126181049150210Ozone
199020815735151004193156Ozone
1989204139391790041108190Ozone
19882111283823175044151223Ozone
1987200143391440039100200Ozone
198630222755182003790164Ozone
198535528061113003480179Ozone
198435829246155003180172Ozone
198333025450215003293200Ozone
19823413023162002861164Ozone
198133027441105002974185Ozone
198036131133170002764143Ozone

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 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem