EnviroNearby

Jessamine County, Kentucky air quality history

Daily Air Quality Index summaries from EPA monitors in Jessamine, Kentucky, 1991–2025.

79%
Good days in 2025
41
Median daily AQI, 2025
0
Days above 100 in 2025
363
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Jessamine, Kentucky on 363 days. 285 of those days (79%) were in the Good range, and the median daily AQI was 41. 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 ozone on 185 days. Across the years with fuller monitoring, the share of Good days rose: an average of 73% in 1992–1994 versus 82% in 2023–2025.

Years with fewer than 120 monitored days (1991) 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%1991: Good 52 of 61 days1991: Moderate 9 of 61 days19911992: Good 169 of 213 days1992: Moderate 41 of 213 days1992: Unhealthy for Sensitive Groups 3 of 213 days1993: Good 147 of 214 days1993: Moderate 57 of 214 days1993: Unhealthy for Sensitive Groups 9 of 214 days1993: Unhealthy 1 of 214 days1994: Good 145 of 208 days1994: Moderate 46 of 208 days1994: Unhealthy for Sensitive Groups 14 of 208 days1994: Unhealthy 3 of 208 days1995: Good 135 of 213 days1995: Moderate 59 of 213 days1995: Unhealthy for Sensitive Groups 14 of 213 days1995: Unhealthy 5 of 213 days1996: Good 158 of 214 days1996: Moderate 47 of 214 days1996: Unhealthy for Sensitive Groups 8 of 214 days1996: Unhealthy 1 of 214 days19961997: Good 152 of 208 days1997: Moderate 42 of 208 days1997: Unhealthy for Sensitive Groups 12 of 208 days1997: Unhealthy 2 of 208 days1998: Good 127 of 213 days1998: Moderate 56 of 213 days1998: Unhealthy for Sensitive Groups 25 of 213 days1998: Unhealthy 5 of 213 days1999: Good 113 of 205 days1999: Moderate 58 of 205 days1999: Unhealthy for Sensitive Groups 32 of 205 days1999: Unhealthy 2 of 205 days2000: Good 160 of 237 days2000: Moderate 67 of 237 days2000: Unhealthy for Sensitive Groups 9 of 237 days2000: Unhealthy 1 of 237 days2001: Good 179 of 244 days2001: Moderate 57 of 244 days2001: Unhealthy for Sensitive Groups 8 of 244 days20012002: Good 167 of 244 days2002: Moderate 51 of 244 days2002: Unhealthy for Sensitive Groups 23 of 244 days2002: Unhealthy 3 of 244 days2003: Good 176 of 244 days2003: Moderate 64 of 244 days2003: Unhealthy for Sensitive Groups 3 of 244 days2003: Unhealthy 1 of 244 days2004: Good 193 of 236 days2004: Moderate 42 of 236 days2004: Unhealthy for Sensitive Groups 1 of 236 days2005: Good 147 of 245 days2005: Moderate 75 of 245 days2005: Unhealthy for Sensitive Groups 23 of 245 days2006: Good 171 of 245 days2006: Moderate 68 of 245 days2006: Unhealthy for Sensitive Groups 6 of 245 days20062007: Good 133 of 240 days2007: Moderate 81 of 240 days2007: Unhealthy for Sensitive Groups 25 of 240 days2007: Unhealthy 1 of 240 days2008: Good 154 of 244 days2008: Moderate 87 of 244 days2008: Unhealthy for Sensitive Groups 3 of 244 days2009: Good 210 of 241 days2009: Moderate 31 of 241 days2010: Good 166 of 244 days2010: Moderate 75 of 244 days2010: Unhealthy for Sensitive Groups 3 of 244 days2011: Good 185 of 245 days2011: Moderate 56 of 245 days2011: Unhealthy for Sensitive Groups 4 of 245 days20112012: Good 180 of 243 days2012: Moderate 50 of 243 days2012: Unhealthy for Sensitive Groups 13 of 243 days2013: Good 220 of 238 days2013: Moderate 18 of 238 days2014: Good 201 of 245 days2014: Moderate 44 of 245 days2015: Good 213 of 244 days2015: Moderate 30 of 244 days2015: Unhealthy for Sensitive Groups 1 of 244 days2016: Good 209 of 245 days2016: Moderate 35 of 245 days2016: Unhealthy for Sensitive Groups 1 of 245 days20162017: Good 226 of 245 days2017: Moderate 19 of 245 days2018: Good 207 of 237 days2018: Moderate 30 of 237 days2019: Good 221 of 245 days2019: Moderate 24 of 245 days2020: Good 232 of 243 days2020: Moderate 11 of 243 days2021: Good 211 of 227 days2021: Moderate 15 of 227 days2021: Unhealthy for Sensitive Groups 1 of 227 days20212022: Good 215 of 243 days2022: Moderate 28 of 243 days2023: Good 211 of 245 days2023: Moderate 32 of 245 days2023: Unhealthy for Sensitive Groups 2 of 245 days2024: Good 200 of 245 days2024: Moderate 45 of 245 days2025: Good 285 of 363 days2025: Moderate 78 of 363 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 year0501001501991: 90th percentile AQI 581992: 90th percentile AQI 641993: 90th percentile AQI 871994: 90th percentile AQI 1001995: 90th percentile AQI 1001996: 90th percentile AQI 841997: 90th percentile AQI 871998: 90th percentile AQI 1081999: 90th percentile AQI 1122000: 90th percentile AQI 872001: 90th percentile AQI 742002: 90th percentile AQI 1012003: 90th percentile AQI 742004: 90th percentile AQI 642005: 90th percentile AQI 972006: 90th percentile AQI 772007: 90th percentile AQI 1052008: 90th percentile AQI 802009: 90th percentile AQI 542010: 90th percentile AQI 742011: 90th percentile AQI 712012: 90th percentile AQI 802013: 90th percentile AQI 502014: 90th percentile AQI 612015: 90th percentile AQI 542016: 90th percentile AQI 612017: 90th percentile AQI 502018: 90th percentile AQI 542019: 90th percentile AQI 502020: 90th percentile AQI 472021: 90th percentile AQI 492022: 90th percentile AQI 512023: 90th percentile AQI 582024: 90th percentile AQI 582025: 90th percentile AQI 571991: Median AQI 341992: Median AQI 411993: Median AQI 441994: Median AQI 441995: Median AQI 451996: Median AQI 421997: Median AQI 411998: Median AQI 471999: Median AQI 482000: Median AQI 452001: Median AQI 442002: Median AQI 422003: Median AQI 432004: Median AQI 402005: Median AQI 472006: Median AQI 442007: Median AQI 492008: Median AQI 462009: Median AQI 392010: Median AQI 462011: Median AQI 442012: Median AQI 432013: Median AQI 402014: Median AQI 412015: Median AQI 402016: Median AQI 412017: Median AQI 402018: Median AQI 392019: Median AQI 432020: Median AQI 372021: Median AQI 382022: Median AQI 402023: Median AQI 432024: Median AQI 432025: Median AQI 4119911996200120062011201620212025
  • 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
Ozone18551%
Fine particles (PM2.5)17849%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253632857800004157100Ozone
2024245200450000435893Ozone
20232452113220004358122Ozone
2022243215280000405187Ozone
20212272111510003849101Ozone
2020243232110000374777Ozone
2019245221240000435067Ozone
2018237207300000395490Ozone
20172452261900004050100Ozone
20162452093510004161126Ozone
20152442133010004054105Ozone
2014245201440000416190Ozone
2013238220180000405077Ozone
201224318050130004380136Ozone
20112451855640004471140Ozone
20102441667530004674108Ozone
2009241210310000395490Ozone
20082441548730004680115Ozone
2007240133812510049105156Ozone
20062451716860004477126Ozone
200524514775230004797140Ozone
20042361934210004064108Ozone
20032441766431004374161Ozone
2002244167512330042101169Ozone
20012441795780004474133Ozone
20002371606791004587161Ozone
1999205113583220048112177Ozone
1998213127562550047108192Ozone
199720815242122004187179Ozone
19962141584781004284164Ozone
1995213135591450045100197Ozone
1994208145461430044100174Ozone
19932141475791004487169Ozone
19922131694130004164143Ozone
1991615290000345893Ozone

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 1991–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem