EnviroNearby

Lorain County, Ohio air quality history

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

87%
Good days in 2025
39
Median daily AQI, 2025
1
Days above 100 in 2025
237
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Lorain, Ohio on 237 days. 207 of those days (87%) were in the Good range, and the median daily AQI was 39. That median is lower than 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 237 days. Across the years with fuller monitoring, the share of Good days rose: an average of 84% in 1980–1982 versus 89% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (237 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%1980: Good 257 of 303 days1980: Moderate 25 of 303 days1980: Unhealthy for Sensitive Groups 16 of 303 days1980: Unhealthy 4 of 303 days1980: Very Unhealthy 1 of 303 days19801981: Good 295 of 348 days1981: Moderate 25 of 348 days1981: Unhealthy for Sensitive Groups 20 of 348 days1981: Unhealthy 8 of 348 days1982: Good 303 of 363 days1982: Moderate 38 of 363 days1982: Unhealthy for Sensitive Groups 16 of 363 days1982: Unhealthy 6 of 363 days1983: Good 289 of 359 days1983: Moderate 43 of 359 days1983: Unhealthy for Sensitive Groups 16 of 359 days1983: Unhealthy 9 of 359 days1983: Very Unhealthy 2 of 359 days1984: Good 295 of 348 days1984: Moderate 34 of 348 days1984: Unhealthy for Sensitive Groups 17 of 348 days1984: Unhealthy 2 of 348 days1985: Good 318 of 365 days1985: Moderate 42 of 365 days1985: Unhealthy for Sensitive Groups 5 of 365 days19851986: Good 271 of 307 days1986: Moderate 33 of 307 days1986: Unhealthy for Sensitive Groups 3 of 307 days1987: Good 193 of 230 days1987: Moderate 32 of 230 days1987: Unhealthy for Sensitive Groups 5 of 230 days1988: Good 149 of 219 days1988: Moderate 30 of 219 days1988: Unhealthy for Sensitive Groups 24 of 219 days1988: Unhealthy 14 of 219 days1988: Very Unhealthy 2 of 219 days1989: Good 163 of 224 days1989: Moderate 40 of 224 days1989: Unhealthy for Sensitive Groups 17 of 224 days1989: Unhealthy 3 of 224 days1989: Very Unhealthy 1 of 224 days1990: Good 168 of 213 days1990: Moderate 33 of 213 days1990: Unhealthy for Sensitive Groups 11 of 213 days1990: Unhealthy 1 of 213 days19901991: Good 195 of 270 days1991: Moderate 55 of 270 days1991: Unhealthy for Sensitive Groups 16 of 270 days1991: Unhealthy 4 of 270 days1992: Good 235 of 280 days1992: Moderate 34 of 280 days1992: Unhealthy for Sensitive Groups 10 of 280 days1992: Unhealthy 1 of 280 days1993: Good 233 of 288 days1993: Moderate 36 of 288 days1993: Unhealthy for Sensitive Groups 17 of 288 days1993: Unhealthy 2 of 288 days1994: Good 217 of 288 days1994: Moderate 55 of 288 days1994: Unhealthy for Sensitive Groups 15 of 288 days1994: Unhealthy 1 of 288 days1995: Good 217 of 286 days1995: Moderate 51 of 286 days1995: Unhealthy for Sensitive Groups 15 of 286 days1995: Unhealthy 3 of 286 days19951996: Good 227 of 290 days1996: Moderate 42 of 290 days1996: Unhealthy for Sensitive Groups 14 of 290 days1996: Unhealthy 7 of 290 days1997: Good 228 of 285 days1997: Moderate 41 of 285 days1997: Unhealthy for Sensitive Groups 12 of 285 days1997: Unhealthy 4 of 285 days1998: Good 221 of 286 days1998: Moderate 43 of 286 days1998: Unhealthy for Sensitive Groups 17 of 286 days1998: Unhealthy 5 of 286 days1999: Good 183 of 308 days1999: Moderate 94 of 308 days1999: Unhealthy for Sensitive Groups 27 of 308 days1999: Unhealthy 3 of 308 days1999: Very Unhealthy 1 of 308 days2000: Good 165 of 252 days2000: Moderate 81 of 252 days2000: Unhealthy for Sensitive Groups 4 of 252 days2000: Unhealthy 2 of 252 days20002001: Good 167 of 291 days2001: Moderate 97 of 291 days2001: Unhealthy for Sensitive Groups 23 of 291 days2001: Unhealthy 4 of 291 days2002: Good 123 of 265 days2002: Moderate 109 of 265 days2002: Unhealthy for Sensitive Groups 16 of 265 days2002: Unhealthy 16 of 265 days2002: Very Unhealthy 1 of 265 days2003: Good 139 of 263 days2003: Moderate 114 of 263 days2003: Unhealthy for Sensitive Groups 7 of 263 days2003: Unhealthy 3 of 263 days2004: Good 150 of 265 days2004: Moderate 107 of 265 days2004: Unhealthy for Sensitive Groups 8 of 265 days2005: Good 127 of 262 days2005: Moderate 114 of 262 days2005: Unhealthy for Sensitive Groups 19 of 262 days2005: Unhealthy 2 of 262 days20052006: Good 157 of 263 days2006: Moderate 104 of 263 days2006: Unhealthy for Sensitive Groups 2 of 263 days2007: Good 142 of 262 days2007: Moderate 107 of 262 days2007: Unhealthy for Sensitive Groups 12 of 262 days2007: Unhealthy 1 of 262 days2008: Good 162 of 263 days2008: Moderate 96 of 263 days2008: Unhealthy for Sensitive Groups 4 of 263 days2008: Unhealthy 1 of 263 days2009: Good 185 of 263 days2009: Moderate 77 of 263 days2009: Unhealthy for Sensitive Groups 1 of 263 days2010: Good 142 of 361 days2010: Moderate 207 of 361 days2010: Unhealthy for Sensitive Groups 12 of 361 days20102011: Good 203 of 355 days2011: Moderate 145 of 355 days2011: Unhealthy for Sensitive Groups 7 of 355 days2012: Good 220 of 364 days2012: Moderate 130 of 364 days2012: Unhealthy for Sensitive Groups 12 of 364 days2012: Unhealthy 2 of 364 days2013: Good 243 of 362 days2013: Moderate 119 of 362 days2014: Good 266 of 363 days2014: Moderate 97 of 363 days2015: Good 288 of 364 days2015: Moderate 76 of 364 days20152016: Good 295 of 365 days2016: Moderate 68 of 365 days2016: Unhealthy for Sensitive Groups 2 of 365 days2017: Good 298 of 365 days2017: Moderate 66 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days2018: Good 255 of 365 days2018: Moderate 109 of 365 days2018: Unhealthy for Sensitive Groups 1 of 365 days2019: Good 260 of 362 days2019: Moderate 102 of 362 days2020: Good 289 of 358 days2020: Moderate 68 of 358 days2020: Unhealthy 1 of 358 days20202021: Good 208 of 304 days2021: Moderate 96 of 304 days2022: Good 228 of 243 days2022: Moderate 14 of 243 days2022: Unhealthy for Sensitive Groups 1 of 243 days2023: Good 221 of 243 days2023: Moderate 22 of 243 days2024: Good 216 of 245 days2024: Moderate 29 of 245 days2025: Good 207 of 237 days2025: Moderate 29 of 237 days2025: Unhealthy for Sensitive Groups 1 of 237 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 year0501001501980: 90th percentile AQI 841981: 90th percentile AQI 801982: 90th percentile AQI 771983: 90th percentile AQI 901984: 90th percentile AQI 741985: 90th percentile AQI 611986: 90th percentile AQI 541987: 90th percentile AQI 611988: 90th percentile AQI 1401989: 90th percentile AQI 971990: 90th percentile AQI 841991: 90th percentile AQI 931992: 90th percentile AQI 671993: 90th percentile AQI 801994: 90th percentile AQI 901995: 90th percentile AQI 801996: 90th percentile AQI 871997: 90th percentile AQI 771998: 90th percentile AQI 931999: 90th percentile AQI 1012000: 90th percentile AQI 802001: 90th percentile AQI 972002: 90th percentile AQI 1152003: 90th percentile AQI 772004: 90th percentile AQI 772005: 90th percentile AQI 972006: 90th percentile AQI 762007: 90th percentile AQI 842008: 90th percentile AQI 702009: 90th percentile AQI 662010: 90th percentile AQI 832011: 90th percentile AQI 702012: 90th percentile AQI 742013: 90th percentile AQI 612014: 90th percentile AQI 592015: 90th percentile AQI 582016: 90th percentile AQI 572017: 90th percentile AQI 562018: 90th percentile AQI 612019: 90th percentile AQI 582020: 90th percentile AQI 552021: 90th percentile AQI 592022: 90th percentile AQI 482023: 90th percentile AQI 502024: 90th percentile AQI 512025: 90th percentile AQI 541980: Median AQI 211981: Median AQI 241982: Median AQI 271983: Median AQI 291984: Median AQI 291985: Median AQI 291986: Median AQI 281987: Median AQI 311988: Median AQI 391989: Median AQI 381990: Median AQI 351991: Median AQI 341992: Median AQI 321993: Median AQI 341994: Median AQI 361995: Median AQI 321996: Median AQI 361997: Median AQI 321998: Median AQI 331999: Median AQI 442000: Median AQI 392001: Median AQI 442002: Median AQI 532003: Median AQI 472004: Median AQI 462005: Median AQI 512006: Median AQI 442007: Median AQI 482008: Median AQI 442009: Median AQI 412010: Median AQI 552011: Median AQI 462012: Median AQI 462013: Median AQI 402014: Median AQI 392015: Median AQI 372016: Median AQI 372017: Median AQI 382018: Median AQI 412019: Median AQI 412020: Median AQI 392021: Median AQI 412022: Median AQI 352023: Median AQI 372024: Median AQI 392025: Median AQI 391980198519901995200020052010201520202025
  • 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
Ozone237100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20252372072910003954119Ozone
2024245216290000395174Ozone
2023243221220000375090Ozone
20222432281410003548115Ozone
2021304208960000415990PM2.5
20203582896801003955155PM2.5
20193622601020000415875PM2.5
201836525510910004161101PM2.5
20173652986610003856101Ozone
20163652956820003757115Ozone
2015364288760000375893PM2.5
2014363266970000395993PM2.5
20133622431190000406194PM2.5
2012364220130122004674159PM2.5
201135520314570004670136PM2.5
2010361142207120005583140PM2.5
20092631857710004166123Ozone
20082631629641004470156Ozone
2007262142107121004884167Ozone
200626315710420004476122Ozone
2005262127114192005197185Ozone
200426515010780004677143Ozone
200326313911473004777172Ozone
200226512310916161053115210Ozone
200129116797234004497161Ozone
20002521658142003980182PM10
1999308183942731044101207Ozone
199828622143175003393172Ozone
199728522841124003277156Ozone
199629022742147003687172Ozone
199528621751153003280187Ozone
199428821755151003690169Ozone
199328823336172003480166Ozone
199228023534101003267159Ozone
199127019555164003493169Ozone
199021316833111003584151Ozone
198922416340173103897205Ozone
19882191493024142039140209Ozone
19872301933250003161136Ozone
19863072713330002854112Ozone
19853653184250002961133Ozone
198434829534172002974166Ozone
198335928943169202990213Ozone
198236330338166002777177Ozone
198134829525208002480200Ozone
198030325725164102184207Ozone

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