EnviroNearby

Fayette County, Kentucky air quality history

Daily Air Quality Index summaries from EPA monitors in Fayette, Kentucky, 1980–2025.

75%
Good days in 2025
40
Median daily AQI, 2025
0
Days above 100 in 2025
364
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Fayette, Kentucky on 364 days. 273 of those days (75%) were in the Good range, and the median daily AQI was 40. That median is about the same as the typical monitored county in Kentucky (median 39 across 25 counties), and about the same as the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 192 days. Across the years with fuller monitoring, the share of Good days rose: an average of 65% in 1980–1982 versus 73% 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 221 of 366 days1980: Moderate 106 of 366 days1980: Unhealthy for Sensitive Groups 29 of 366 days1980: Unhealthy 10 of 366 days19801981: Good 258 of 364 days1981: Moderate 85 of 364 days1981: Unhealthy for Sensitive Groups 19 of 364 days1981: Unhealthy 2 of 364 days1982: Good 235 of 365 days1982: Moderate 100 of 365 days1982: Unhealthy for Sensitive Groups 26 of 365 days1982: Unhealthy 4 of 365 days1983: Good 224 of 365 days1983: Moderate 85 of 365 days1983: Unhealthy for Sensitive Groups 39 of 365 days1983: Unhealthy 15 of 365 days1983: Very Unhealthy 2 of 365 days1984: Good 250 of 365 days1984: Moderate 78 of 365 days1984: Unhealthy for Sensitive Groups 29 of 365 days1984: Unhealthy 8 of 365 days1985: Good 275 of 363 days1985: Moderate 67 of 363 days1985: Unhealthy for Sensitive Groups 17 of 363 days1985: Unhealthy 4 of 363 days19851986: Good 251 of 365 days1986: Moderate 73 of 365 days1986: Unhealthy for Sensitive Groups 31 of 365 days1986: Unhealthy 8 of 365 days1986: Very Unhealthy 2 of 365 days1987: Good 230 of 365 days1987: Moderate 69 of 365 days1987: Unhealthy for Sensitive Groups 49 of 365 days1987: Unhealthy 16 of 365 days1987: Very Unhealthy 1 of 365 days1988: Good 226 of 366 days1988: Moderate 76 of 366 days1988: Unhealthy for Sensitive Groups 37 of 366 days1988: Unhealthy 18 of 366 days1988: Very Unhealthy 9 of 366 days1989: Good 235 of 365 days1989: Moderate 97 of 365 days1989: Unhealthy for Sensitive Groups 19 of 365 days1989: Unhealthy 13 of 365 days1989: Very Unhealthy 1 of 365 days1990: Good 256 of 365 days1990: Moderate 85 of 365 days1990: Unhealthy for Sensitive Groups 19 of 365 days1990: Unhealthy 5 of 365 days19901991: Good 273 of 365 days1991: Moderate 75 of 365 days1991: Unhealthy for Sensitive Groups 14 of 365 days1991: Unhealthy 3 of 365 days1992: Good 301 of 366 days1992: Moderate 63 of 366 days1992: Unhealthy for Sensitive Groups 2 of 366 days1993: Good 255 of 365 days1993: Moderate 87 of 365 days1993: Unhealthy for Sensitive Groups 20 of 365 days1993: Unhealthy 3 of 365 days1994: Good 267 of 365 days1994: Moderate 74 of 365 days1994: Unhealthy for Sensitive Groups 19 of 365 days1994: Unhealthy 5 of 365 days1995: Good 262 of 365 days1995: Moderate 73 of 365 days1995: Unhealthy for Sensitive Groups 22 of 365 days1995: Unhealthy 8 of 365 days19951996: Good 296 of 366 days1996: Moderate 53 of 366 days1996: Unhealthy for Sensitive Groups 13 of 366 days1996: Unhealthy 4 of 366 days1997: Good 284 of 365 days1997: Moderate 61 of 365 days1997: Unhealthy for Sensitive Groups 17 of 365 days1997: Unhealthy 3 of 365 days1998: Good 269 of 365 days1998: Moderate 73 of 365 days1998: Unhealthy for Sensitive Groups 19 of 365 days1998: Unhealthy 3 of 365 days1998: Very Unhealthy 1 of 365 days1999: Good 185 of 365 days1999: Moderate 120 of 365 days1999: Unhealthy for Sensitive Groups 49 of 365 days1999: Unhealthy 11 of 365 days2000: Good 212 of 366 days2000: Moderate 144 of 366 days2000: Unhealthy for Sensitive Groups 9 of 366 days2000: Unhealthy 1 of 366 days20002001: Good 195 of 365 days2001: Moderate 157 of 365 days2001: Unhealthy for Sensitive Groups 12 of 365 days2001: Unhealthy 1 of 365 days2002: Good 203 of 365 days2002: Moderate 135 of 365 days2002: Unhealthy for Sensitive Groups 24 of 365 days2002: Unhealthy 3 of 365 days2003: Good 215 of 365 days2003: Moderate 141 of 365 days2003: Unhealthy for Sensitive Groups 9 of 365 days2004: Good 243 of 366 days2004: Moderate 123 of 366 days2005: Good 206 of 362 days2005: Moderate 141 of 362 days2005: Unhealthy for Sensitive Groups 14 of 362 days2005: Unhealthy 1 of 362 days20052006: Good 220 of 365 days2006: Moderate 140 of 365 days2006: Unhealthy for Sensitive Groups 5 of 365 days2007: Good 116 of 365 days2007: Moderate 222 of 365 days2007: Unhealthy for Sensitive Groups 25 of 365 days2007: Unhealthy 1 of 365 days2007: Very Unhealthy 1 of 365 days2008: Good 168 of 364 days2008: Moderate 194 of 364 days2008: Unhealthy for Sensitive Groups 2 of 364 days2009: Good 178 of 365 days2009: Moderate 187 of 365 days2010: Good 155 of 365 days2010: Moderate 204 of 365 days2010: Unhealthy for Sensitive Groups 6 of 365 days20102011: Good 137 of 365 days2011: Moderate 221 of 365 days2011: Unhealthy for Sensitive Groups 7 of 365 days2012: Good 146 of 366 days2012: Moderate 202 of 366 days2012: Unhealthy for Sensitive Groups 17 of 366 days2012: Unhealthy 1 of 366 days2013: Good 172 of 365 days2013: Moderate 193 of 365 days2014: Good 215 of 365 days2014: Moderate 150 of 365 days2015: Good 250 of 364 days2015: Moderate 109 of 364 days2015: Unhealthy for Sensitive Groups 5 of 364 days20152016: Good 257 of 362 days2016: Moderate 105 of 362 days2017: Good 249 of 364 days2017: Moderate 115 of 364 days2018: Good 202 of 364 days2018: Moderate 162 of 364 days2019: Good 231 of 364 days2019: Moderate 133 of 364 days2020: Good 258 of 366 days2020: Moderate 108 of 366 days20202021: Good 214 of 363 days2021: Moderate 148 of 363 days2021: Unhealthy for Sensitive Groups 1 of 363 days2022: Good 235 of 365 days2022: Moderate 129 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 232 of 365 days2023: Moderate 131 of 365 days2023: Unhealthy for Sensitive Groups 1 of 365 days2023: Unhealthy 1 of 365 days2024: Good 266 of 336 days2024: Moderate 70 of 336 days2025: Good 273 of 364 days2025: Moderate 91 of 364 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 1011981: 90th percentile AQI 801982: 90th percentile AQI 931983: 90th percentile AQI 1221984: 90th percentile AQI 1011985: 90th percentile AQI 821986: 90th percentile AQI 1051987: 90th percentile AQI 1291988: 90th percentile AQI 1331989: 90th percentile AQI 1001990: 90th percentile AQI 871991: 90th percentile AQI 801992: 90th percentile AQI 601993: 90th percentile AQI 871994: 90th percentile AQI 901995: 90th percentile AQI 931996: 90th percentile AQI 711997: 90th percentile AQI 801998: 90th percentile AQI 901999: 90th percentile AQI 1192000: 90th percentile AQI 802001: 90th percentile AQI 802002: 90th percentile AQI 872003: 90th percentile AQI 802004: 90th percentile AQI 692005: 90th percentile AQI 842006: 90th percentile AQI 742007: 90th percentile AQI 962008: 90th percentile AQI 772009: 90th percentile AQI 682010: 90th percentile AQI 742011: 90th percentile AQI 742012: 90th percentile AQI 782013: 90th percentile AQI 642014: 90th percentile AQI 662015: 90th percentile AQI 632016: 90th percentile AQI 612017: 90th percentile AQI 582018: 90th percentile AQI 622019: 90th percentile AQI 582020: 90th percentile AQI 572021: 90th percentile AQI 662022: 90th percentile AQI 602023: 90th percentile AQI 642024: 90th percentile AQI 542025: 90th percentile AQI 571980: Median AQI 451981: Median AQI 421982: Median AQI 441983: Median AQI 441984: Median AQI 431985: Median AQI 361986: Median AQI 411987: Median AQI 441988: Median AQI 441989: Median AQI 441990: Median AQI 411991: Median AQI 381992: Median AQI 371993: Median AQI 401994: Median AQI 411995: Median AQI 411996: Median AQI 351997: Median AQI 371998: Median AQI 361999: Median AQI 502000: Median AQI 452001: Median AQI 482002: Median AQI 452003: Median AQI 442004: Median AQI 412005: Median AQI 472006: Median AQI 442007: Median AQI 582008: Median AQI 522009: Median AQI 512010: Median AQI 532011: Median AQI 542012: Median AQI 532013: Median AQI 522014: Median AQI 472015: Median AQI 422016: Median AQI 432017: Median AQI 442018: Median AQI 482019: Median AQI 462020: Median AQI 422021: Median AQI 472022: Median AQI 442023: Median AQI 452024: Median AQI 412025: Median AQI 401980198519901995200020052010201520202025
  • 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)19253%
Ozone16746%
Nitrogen dioxide (NO₂)51%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253642739100004057100PM2.5
2024336266700000415477Ozone
202336523213111004564167PM2.5
202236523512910004460106PM2.5
202136321414810004766108PM2.5
20203662581080000425786PM2.5
20193642311330000465880PM2.5
20183642021620000486287PM2.5
20173642491150000445897PM2.5
20163622571050000436193PM2.5
201536425010950004263139PM2.5
20143652151500000476693PM2.5
20133651721930000526483PM2.5
2012366146202171005378151PM2.5
201136513722170005474133PM2.5
201036515520460005374115PM2.5
20093651781870000516893PM2.5
200836416819420005277126PM2.5
2007365116222251105896227PM2.5
200636522014050004474119Ozone
2005362206141141004784167Ozone
200436624312300004169100Ozone
200336521514190004480150Ozone
2002365203135243004587156Ozone
2001365195157121004880164Ozone
200036621214491004580159Ozone
199936518512049110050119185Ozone
199836526973193103690206Ozone
199736528461173003780174Ozone
199636629653134003571159Ozone
199536526273228004193197Ozone
199436526774195004190192Ozone
199336525587203004087197NO2
19923663016320003760115NO2
199136527375143003880187NO2
199036525685195004187190NO2
19893652359719131044100203NO2
19883662267637189044133217NO2
19873652306949161044129206Ozone
1986365251733182041105210Ozone
198536327567174003682187Ozone
1984365250782980043101200Ozone
19833652248539152044122216Ozone
1982365235100264004493169Ozone
198136425885192004280185Ozone
198036622110629100045101185Ozone

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 Kentucky with a similar median AQI in 2025

All monitored counties in Kentucky

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