EnviroNearby

Trumbull County, Ohio air quality history

Daily Air Quality Index summaries from EPA monitors in Trumbull, Ohio, 1981–2025.

60%
Good days in 2025
46
Median daily AQI, 2025
5
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Trumbull, Ohio on 365 days. 220 of those days (60%) were in the Good range, and the median daily AQI was 46. That median is higher than 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 fine particles (PM2.5) on 208 days. Across the years with fuller monitoring, the share of Good days fell: an average of 80% in 1982–1991 versus 59% in 2023–2025.

Years with fewer than 120 monitored days (1981, 1988, 1989) are shown in the table but left out of comparisons and trend statements.

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%1981: Good 21 of 81 days1981: Moderate 35 of 81 days1981: Unhealthy for Sensitive Groups 25 of 81 days19811982: Good 134 of 249 days1982: Moderate 91 of 249 days1982: Unhealthy for Sensitive Groups 24 of 249 days1988: Good 4 of 4 days1989: Good 55 of 60 days1989: Moderate 5 of 60 days1990: Good 138 of 149 days1990: Moderate 11 of 149 days1991: Good 175 of 189 days1991: Moderate 14 of 189 days19911992: Good 216 of 290 days1992: Moderate 50 of 290 days1992: Unhealthy for Sensitive Groups 15 of 290 days1992: Unhealthy 9 of 290 days1993: Good 189 of 288 days1993: Moderate 56 of 288 days1993: Unhealthy for Sensitive Groups 36 of 288 days1993: Unhealthy 6 of 288 days1993: Very Unhealthy 1 of 288 days1994: Good 200 of 289 days1994: Moderate 53 of 289 days1994: Unhealthy for Sensitive Groups 31 of 289 days1994: Unhealthy 5 of 289 days1995: Good 191 of 290 days1995: Moderate 65 of 290 days1995: Unhealthy for Sensitive Groups 25 of 290 days1995: Unhealthy 9 of 290 days1996: Good 157 of 239 days1996: Moderate 54 of 239 days1996: Unhealthy for Sensitive Groups 20 of 239 days1996: Unhealthy 8 of 239 days19961997: Good 163 of 239 days1997: Moderate 49 of 239 days1997: Unhealthy for Sensitive Groups 18 of 239 days1997: Unhealthy 9 of 239 days1998: Good 134 of 240 days1998: Moderate 58 of 240 days1998: Unhealthy for Sensitive Groups 29 of 240 days1998: Unhealthy 18 of 240 days1998: Very Unhealthy 1 of 240 days1999: Good 71 of 351 days1999: Moderate 239 of 351 days1999: Unhealthy for Sensitive Groups 31 of 351 days1999: Unhealthy 10 of 351 days2000: Good 84 of 351 days2000: Moderate 246 of 351 days2000: Unhealthy for Sensitive Groups 19 of 351 days2000: Unhealthy 2 of 351 days2001: Good 75 of 359 days2001: Moderate 239 of 359 days2001: Unhealthy for Sensitive Groups 32 of 359 days2001: Unhealthy 13 of 359 days20012002: Good 98 of 358 days2002: Moderate 218 of 358 days2002: Unhealthy for Sensitive Groups 20 of 358 days2002: Unhealthy 21 of 358 days2002: Very Unhealthy 1 of 358 days2003: Good 86 of 362 days2003: Moderate 254 of 362 days2003: Unhealthy for Sensitive Groups 17 of 362 days2003: Unhealthy 3 of 362 days2003: Very Unhealthy 2 of 362 days2004: Good 111 of 360 days2004: Moderate 225 of 360 days2004: Unhealthy for Sensitive Groups 22 of 360 days2004: Unhealthy 2 of 360 days2005: Good 104 of 263 days2005: Moderate 121 of 263 days2005: Unhealthy for Sensitive Groups 33 of 263 days2005: Unhealthy 5 of 263 days2006: Good 131 of 265 days2006: Moderate 116 of 265 days2006: Unhealthy for Sensitive Groups 16 of 265 days2006: Unhealthy 2 of 265 days20062007: Good 123 of 262 days2007: Moderate 107 of 262 days2007: Unhealthy for Sensitive Groups 30 of 262 days2007: Unhealthy 2 of 262 days2008: Good 146 of 258 days2008: Moderate 98 of 258 days2008: Unhealthy for Sensitive Groups 14 of 258 days2009: Good 197 of 239 days2009: Moderate 38 of 239 days2009: Unhealthy for Sensitive Groups 4 of 239 days2010: Good 149 of 360 days2010: Moderate 204 of 360 days2010: Unhealthy for Sensitive Groups 6 of 360 days2010: Unhealthy 1 of 360 days2011: Good 148 of 362 days2011: Moderate 204 of 362 days2011: Unhealthy for Sensitive Groups 10 of 362 days20112012: Good 142 of 366 days2012: Moderate 207 of 366 days2012: Unhealthy for Sensitive Groups 15 of 366 days2012: Unhealthy 2 of 366 days2013: Good 189 of 365 days2013: Moderate 175 of 365 days2013: Unhealthy for Sensitive Groups 1 of 365 days2014: Good 148 of 353 days2014: Moderate 203 of 353 days2014: Unhealthy for Sensitive Groups 2 of 353 days2015: Good 213 of 293 days2015: Moderate 77 of 293 days2015: Unhealthy for Sensitive Groups 3 of 293 days2016: Good 255 of 366 days2016: Moderate 106 of 366 days2016: Unhealthy for Sensitive Groups 5 of 366 days20162017: Good 217 of 352 days2017: Moderate 133 of 352 days2017: Unhealthy for Sensitive Groups 2 of 352 days2018: Good 254 of 353 days2018: Moderate 95 of 353 days2018: Unhealthy for Sensitive Groups 4 of 353 days2019: Good 249 of 362 days2019: Moderate 113 of 362 days2020: Good 280 of 357 days2020: Moderate 74 of 357 days2020: Unhealthy for Sensitive Groups 2 of 357 days2020: Unhealthy 1 of 357 days2021: Good 219 of 363 days2021: Moderate 141 of 363 days2021: Unhealthy for Sensitive Groups 3 of 363 days20212022: Good 255 of 360 days2022: Moderate 103 of 360 days2022: Unhealthy for Sensitive Groups 2 of 360 days2023: Good 198 of 364 days2023: Moderate 158 of 364 days2023: Unhealthy for Sensitive Groups 5 of 364 days2023: Unhealthy 2 of 364 days2023: Very Unhealthy 1 of 364 days2024: Good 226 of 366 days2024: Moderate 140 of 366 days2025: Good 220 of 365 days2025: Moderate 140 of 365 days2025: Unhealthy for Sensitive Groups 5 of 365 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 year0501001501981: 90th percentile AQI 1101982: 90th percentile AQI 1001988: 90th percentile AQI 341989: 90th percentile AQI 481990: 90th percentile AQI 451991: 90th percentile AQI 481992: 90th percentile AQI 931993: 90th percentile AQI 1191994: 90th percentile AQI 1121995: 90th percentile AQI 1081996: 90th percentile AQI 1081997: 90th percentile AQI 1081998: 90th percentile AQI 1471999: 90th percentile AQI 1052000: 90th percentile AQI 932001: 90th percentile AQI 1122002: 90th percentile AQI 1152003: 90th percentile AQI 882004: 90th percentile AQI 932005: 90th percentile AQI 1082006: 90th percentile AQI 872007: 90th percentile AQI 1082008: 90th percentile AQI 902009: 90th percentile AQI 612010: 90th percentile AQI 802011: 90th percentile AQI 752012: 90th percentile AQI 802013: 90th percentile AQI 652014: 90th percentile AQI 682015: 90th percentile AQI 642016: 90th percentile AQI 612017: 90th percentile AQI 622018: 90th percentile AQI 642019: 90th percentile AQI 602020: 90th percentile AQI 572021: 90th percentile AQI 672022: 90th percentile AQI 602023: 90th percentile AQI 762024: 90th percentile AQI 642025: 90th percentile AQI 741981: Median AQI 731982: Median AQI 471988: Median AQI 281989: Median AQI 281990: Median AQI 231991: Median AQI 261992: Median AQI 401993: Median AQI 411994: Median AQI 421995: Median AQI 421996: Median AQI 441997: Median AQI 441998: Median AQI 471999: Median AQI 632000: Median AQI 602001: Median AQI 612002: Median AQI 582003: Median AQI 582004: Median AQI 572005: Median AQI 572006: Median AQI 512007: Median AQI 522008: Median AQI 462009: Median AQI 412010: Median AQI 542011: Median AQI 532012: Median AQI 532013: Median AQI 492014: Median AQI 532015: Median AQI 422016: Median AQI 422017: Median AQI 442018: Median AQI 422019: Median AQI 442020: Median AQI 402021: Median AQI 452022: Median AQI 422023: Median AQI 482024: Median AQI 452025: Median AQI 46198119911996200120062011201620212025
  • 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
Fine particles (PM2.5)20857%
Ozone15743%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536522014050004674130PM2.5
20243662261400000456497PM2.5
202336419815852104876220PM2.5
202236025510320004260136PM2.5
202136321914130004567147PM2.5
20203572807421004057154Ozone
201936224911300004460100PM2.5
20183532549540004264108Ozone
201735221713320004462115PM2.5
201636625510650004261133PM2.5
20152932137730004264112Ozone
201435314820320005368126PM2.5
201336518917510004965133PM2.5
2012366142207152005380187PM2.5
2011362148204100005375140PM2.5
201036014920461005480159PM2.5
20092391973840004161108Ozone
200825814698140004690140Ozone
20072621231073020052108166Ozone
2006265131116162005187159Ozone
20052631041213350057108174Ozone
2004360111225222005793159PM2.5
200336286254173205888210PM2.5
20023589821820211058115201PM2.5
20013597523932130061112190PM2.5
200035184246192006093190PM2.5
19993517123931100063105182PM2.5
19982401345829181047147205Ozone
1997239163491890044108187Ozone
1996239157542080044108179Ozone
1995290191652590042108192Ozone
1994289200533150042112172Ozone
1993288189563661041119203Ozone
199229021650159004093195Ozone
1991189175140000264866PM10
1990149138110000234568PM10
1989605550000284869PM10
19884400000283434PM10
1982249134912400047100134NO2
19818121352500073110120NO2

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 1981–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem