EnviroNearby

Morgan County, Kentucky air quality history

Daily Air Quality Index summaries from EPA monitors in Morgan, Kentucky, 1993–2025.

95%
Good days in 2025
35
Median daily AQI, 2025
0
Days above 100 in 2025
356
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Morgan, Kentucky on 356 days. 337 of those days (95%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in Kentucky (median 39 across 25 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 356 days. Across the years with fuller monitoring, the share of Good days rose: an average of 69% in 1993–1995 versus 94% 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%1993: Good 103 of 123 days1993: Moderate 18 of 123 days1993: Unhealthy for Sensitive Groups 2 of 123 days19931994: Good 245 of 357 days1994: Moderate 88 of 357 days1994: Unhealthy for Sensitive Groups 17 of 357 days1994: Unhealthy 5 of 357 days1994: Very Unhealthy 2 of 357 days1995: Good 148 of 270 days1995: Moderate 83 of 270 days1995: Unhealthy for Sensitive Groups 33 of 270 days1995: Unhealthy 5 of 270 days1995: Very Unhealthy 1 of 270 days1996: Good 146 of 213 days1996: Moderate 50 of 213 days1996: Unhealthy for Sensitive Groups 12 of 213 days1996: Unhealthy 4 of 213 days1996: Very Unhealthy 1 of 213 days1997: Good 256 of 362 days1997: Moderate 91 of 362 days1997: Unhealthy for Sensitive Groups 15 of 362 days1998: Good 227 of 362 days1998: Moderate 86 of 362 days1998: Unhealthy for Sensitive Groups 39 of 362 days1998: Unhealthy 10 of 362 days19981999: Good 195 of 363 days1999: Moderate 114 of 363 days1999: Unhealthy for Sensitive Groups 45 of 363 days1999: Unhealthy 9 of 363 days2000: Good 243 of 362 days2000: Moderate 96 of 362 days2000: Unhealthy for Sensitive Groups 23 of 362 days2001: Good 249 of 364 days2001: Moderate 100 of 364 days2001: Unhealthy for Sensitive Groups 15 of 364 days2002: Good 271 of 363 days2002: Moderate 65 of 363 days2002: Unhealthy for Sensitive Groups 17 of 363 days2002: Unhealthy 10 of 363 days2003: Good 270 of 340 days2003: Moderate 63 of 340 days2003: Unhealthy for Sensitive Groups 6 of 340 days2003: Unhealthy 1 of 340 days20032004: Good 312 of 363 days2004: Moderate 47 of 363 days2004: Unhealthy for Sensitive Groups 4 of 363 days2005: Good 266 of 361 days2005: Moderate 79 of 361 days2005: Unhealthy for Sensitive Groups 16 of 361 days2006: Good 261 of 333 days2006: Moderate 63 of 333 days2006: Unhealthy for Sensitive Groups 9 of 333 days2007: Good 225 of 321 days2007: Moderate 84 of 321 days2007: Unhealthy for Sensitive Groups 12 of 321 days2008: Good 271 of 361 days2008: Moderate 83 of 361 days2008: Unhealthy for Sensitive Groups 7 of 361 days20082009: Good 310 of 356 days2009: Moderate 44 of 356 days2009: Unhealthy for Sensitive Groups 2 of 356 days2010: Good 265 of 334 days2010: Moderate 64 of 334 days2010: Unhealthy for Sensitive Groups 5 of 334 days2011: Good 310 of 338 days2011: Moderate 26 of 338 days2011: Unhealthy for Sensitive Groups 2 of 338 days2012: Good 282 of 335 days2012: Moderate 49 of 335 days2012: Unhealthy for Sensitive Groups 4 of 335 days2013: Good 346 of 358 days2013: Moderate 12 of 358 days20132014: Good 319 of 341 days2014: Moderate 22 of 341 days2015: Good 331 of 362 days2015: Moderate 31 of 362 days2016: Good 331 of 365 days2016: Moderate 32 of 365 days2016: Unhealthy for Sensitive Groups 2 of 365 days2017: Good 334 of 355 days2017: Moderate 21 of 355 days2018: Good 337 of 364 days2018: Moderate 27 of 364 days20182019: Good 341 of 356 days2019: Moderate 15 of 356 days2020: Good 361 of 365 days2020: Moderate 4 of 365 days2021: Good 338 of 352 days2021: Moderate 14 of 352 days2022: Good 347 of 364 days2022: Moderate 17 of 364 days2023: Good 341 of 364 days2023: Moderate 23 of 364 days20232024: Good 334 of 359 days2024: Moderate 25 of 359 days2025: Good 337 of 356 days2025: Moderate 19 of 356 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 year0501001501993: 90th percentile AQI 711994: 90th percentile AQI 901995: 90th percentile AQI 1191996: 90th percentile AQI 901997: 90th percentile AQI 871998: 90th percentile AQI 1121999: 90th percentile AQI 1152000: 90th percentile AQI 902001: 90th percentile AQI 842002: 90th percentile AQI 842003: 90th percentile AQI 672004: 90th percentile AQI 612005: 90th percentile AQI 802006: 90th percentile AQI 642007: 90th percentile AQI 842008: 90th percentile AQI 712009: 90th percentile AQI 542010: 90th percentile AQI 712011: 90th percentile AQI 502012: 90th percentile AQI 612013: 90th percentile AQI 462014: 90th percentile AQI 492015: 90th percentile AQI 492016: 90th percentile AQI 502017: 90th percentile AQI 482018: 90th percentile AQI 482019: 90th percentile AQI 472020: 90th percentile AQI 442021: 90th percentile AQI 472022: 90th percentile AQI 462023: 90th percentile AQI 492024: 90th percentile AQI 492025: 90th percentile AQI 471993: Median AQI 311994: Median AQI 441995: Median AQI 481996: Median AQI 431997: Median AQI 411998: Median AQI 441999: Median AQI 472000: Median AQI 432001: Median AQI 432002: Median AQI 402003: Median AQI 392004: Median AQI 382005: Median AQI 392006: Median AQI 392007: Median AQI 412008: Median AQI 412009: Median AQI 372010: Median AQI 412011: Median AQI 382012: Median AQI 392013: Median AQI 352014: Median AQI 352015: Median AQI 372016: Median AQI 372017: Median AQI 372018: Median AQI 342019: Median AQI 362020: Median AQI 332021: Median AQI 352022: Median AQI 352023: Median AQI 382024: Median AQI 382025: Median AQI 3519931998200320082013201820232025
  • 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
Ozone356100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025356337190000354787Ozone
2024359334250000384964Ozone
2023364341230000384993Ozone
2022364347170000354674Ozone
2021352338140000354771Ozone
202036536140000334464Ozone
2019356341150000364780Ozone
2018364337270000344880Ozone
2017355334210000374893Ozone
20163653313220003750112Ozone
2015362331310000374987Ozone
2014341319220000354987Ozone
2013358346120000354674Ozone
20123352824940003961136Ozone
20113383102620003850108Ozone
20103342656450004171133Ozone
20093563104420003754105Ozone
20083612718370004171133Ozone
200732122584120004184136Ozone
20063332616390003964147Ozone
200536126679160003980136Ozone
20043633124740003861115Ozone
20033402706361003967161Ozone
2002363271651710004084187Ozone
2001364249100150004384136Ozone
200036224396230004390147Ozone
19993631951144590047115190Ozone
19983622278639100044112190Ozone
199736225691150004187140Ozone
199621314650124104390209Ozone
1995270148833351048119205Ozone
199435724588175204490210Ozone
19931231031820003171105Ozone

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 1993–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem