EnviroNearby

Hancock County, Kentucky air quality history

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

83%
Good days in 2025
43
Median daily AQI, 2025
0
Days above 100 in 2025
242
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Hancock, Kentucky on 242 days. 200 of those days (83%) were in the Good range, and the median daily AQI was 43. That median is higher than the typical monitored county in Kentucky (median 39 across 25 counties), and higher than the typical monitored U.S. county (40). The main pollutant was ozone on 242 days. Across the years with fuller monitoring, the share of Good days rose: an average of 68% in 1981–1983 versus 84% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (242 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.

Years with fewer than 120 monitored days (1980) 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%1980: Good 66 of 68 days1980: Moderate 2 of 68 days19801981: Good 230 of 280 days1981: Moderate 35 of 280 days1981: Unhealthy for Sensitive Groups 13 of 280 days1981: Unhealthy 2 of 280 days1982: Good 220 of 296 days1982: Moderate 60 of 296 days1982: Unhealthy for Sensitive Groups 15 of 296 days1982: Unhealthy 1 of 296 days1983: Good 86 of 179 days1983: Moderate 40 of 179 days1983: Unhealthy for Sensitive Groups 34 of 179 days1983: Unhealthy 17 of 179 days1983: Very Unhealthy 2 of 179 days1984: Good 111 of 212 days1984: Moderate 70 of 212 days1984: Unhealthy for Sensitive Groups 25 of 212 days1984: Unhealthy 6 of 212 days1985: Good 114 of 206 days1985: Moderate 64 of 206 days1985: Unhealthy for Sensitive Groups 22 of 206 days1985: Unhealthy 6 of 206 days19851986: Good 110 of 214 days1986: Moderate 61 of 214 days1986: Unhealthy for Sensitive Groups 31 of 214 days1986: Unhealthy 10 of 214 days1986: Very Unhealthy 2 of 214 days1987: Good 85 of 211 days1987: Moderate 60 of 211 days1987: Unhealthy for Sensitive Groups 54 of 211 days1987: Unhealthy 10 of 211 days1987: Very Unhealthy 2 of 211 days1988: Good 91 of 207 days1988: Moderate 57 of 207 days1988: Unhealthy for Sensitive Groups 30 of 207 days1988: Unhealthy 15 of 207 days1988: Very Unhealthy 14 of 207 days1989: Good 110 of 211 days1989: Moderate 68 of 211 days1989: Unhealthy for Sensitive Groups 27 of 211 days1989: Unhealthy 6 of 211 days1990: Good 90 of 214 days1990: Moderate 58 of 214 days1990: Unhealthy for Sensitive Groups 39 of 214 days1990: Unhealthy 25 of 214 days1990: Very Unhealthy 2 of 214 days19901991: Good 147 of 206 days1991: Moderate 47 of 206 days1991: Unhealthy for Sensitive Groups 11 of 206 days1991: Unhealthy 1 of 206 days1992: Good 137 of 208 days1992: Moderate 56 of 208 days1992: Unhealthy for Sensitive Groups 14 of 208 days1992: Unhealthy 1 of 208 days1993: Good 150 of 214 days1993: Moderate 46 of 214 days1993: Unhealthy for Sensitive Groups 17 of 214 days1993: Unhealthy 1 of 214 days1994: Good 126 of 213 days1994: Moderate 59 of 213 days1994: Unhealthy for Sensitive Groups 22 of 213 days1994: Unhealthy 6 of 213 days1995: Good 105 of 213 days1995: Moderate 72 of 213 days1995: Unhealthy for Sensitive Groups 28 of 213 days1995: Unhealthy 8 of 213 days19951996: Good 135 of 206 days1996: Moderate 48 of 206 days1996: Unhealthy for Sensitive Groups 18 of 206 days1996: Unhealthy 5 of 206 days1997: Good 131 of 214 days1997: Moderate 62 of 214 days1997: Unhealthy for Sensitive Groups 18 of 214 days1997: Unhealthy 3 of 214 days1998: Good 79 of 214 days1998: Moderate 86 of 214 days1998: Unhealthy for Sensitive Groups 40 of 214 days1998: Unhealthy 8 of 214 days1998: Very Unhealthy 1 of 214 days1999: Good 95 of 214 days1999: Moderate 71 of 214 days1999: Unhealthy for Sensitive Groups 40 of 214 days1999: Unhealthy 8 of 214 days2000: Good 160 of 238 days2000: Moderate 63 of 238 days2000: Unhealthy for Sensitive Groups 15 of 238 days20002001: Good 142 of 235 days2001: Moderate 76 of 235 days2001: Unhealthy for Sensitive Groups 16 of 235 days2001: Unhealthy 1 of 235 days2002: Good 141 of 245 days2002: Moderate 69 of 245 days2002: Unhealthy for Sensitive Groups 29 of 245 days2002: Unhealthy 6 of 245 days2003: Good 149 of 242 days2003: Moderate 75 of 242 days2003: Unhealthy for Sensitive Groups 18 of 242 days2004: Good 201 of 245 days2004: Moderate 40 of 245 days2004: Unhealthy for Sensitive Groups 4 of 245 days2005: Good 163 of 244 days2005: Moderate 74 of 244 days2005: Unhealthy for Sensitive Groups 7 of 244 days20052006: Good 149 of 241 days2006: Moderate 76 of 241 days2006: Unhealthy for Sensitive Groups 16 of 241 days2007: Good 136 of 241 days2007: Moderate 78 of 241 days2007: Unhealthy for Sensitive Groups 26 of 241 days2007: Unhealthy 1 of 241 days2008: Good 169 of 237 days2008: Moderate 63 of 237 days2008: Unhealthy for Sensitive Groups 5 of 237 days2009: Good 202 of 243 days2009: Moderate 40 of 243 days2009: Unhealthy for Sensitive Groups 1 of 243 days2010: Good 151 of 241 days2010: Moderate 82 of 241 days2010: Unhealthy for Sensitive Groups 8 of 241 days20102011: Good 172 of 236 days2011: Moderate 56 of 236 days2011: Unhealthy for Sensitive Groups 8 of 236 days2012: Good 168 of 244 days2012: Moderate 58 of 244 days2012: Unhealthy for Sensitive Groups 16 of 244 days2012: Unhealthy 2 of 244 days2013: Good 209 of 237 days2013: Moderate 27 of 237 days2013: Unhealthy for Sensitive Groups 1 of 237 days2014: Good 198 of 237 days2014: Moderate 38 of 237 days2014: Unhealthy for Sensitive Groups 1 of 237 days2015: Good 203 of 245 days2015: Moderate 37 of 245 days2015: Unhealthy for Sensitive Groups 5 of 245 days20152016: Good 200 of 242 days2016: Moderate 39 of 242 days2016: Unhealthy for Sensitive Groups 3 of 242 days2017: Good 217 of 245 days2017: Moderate 28 of 245 days2018: Good 115 of 125 days2018: Moderate 10 of 125 days2019: Good 208 of 245 days2019: Moderate 37 of 245 days2020: Good 233 of 245 days2020: Moderate 12 of 245 days20202021: Good 220 of 241 days2021: Moderate 21 of 241 days2022: Good 219 of 243 days2022: Moderate 23 of 243 days2022: Unhealthy for Sensitive Groups 1 of 243 days2023: Good 201 of 245 days2023: Moderate 38 of 245 days2023: Unhealthy for Sensitive Groups 6 of 245 days2024: Good 200 of 229 days2024: Moderate 29 of 229 days2025: Good 200 of 242 days2025: Moderate 42 of 242 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 year0501001502001980: 90th percentile AQI 381981: 90th percentile AQI 801982: 90th percentile AQI 901983: 90th percentile AQI 1561984: 90th percentile AQI 1191985: 90th percentile AQI 1081986: 90th percentile AQI 1361987: 90th percentile AQI 1361988: 90th percentile AQI 1901989: 90th percentile AQI 1081990: 90th percentile AQI 1561991: 90th percentile AQI 801992: 90th percentile AQI 841993: 90th percentile AQI 901994: 90th percentile AQI 1121995: 90th percentile AQI 1221996: 90th percentile AQI 1081997: 90th percentile AQI 1001998: 90th percentile AQI 1331999: 90th percentile AQI 1292000: 90th percentile AQI 872001: 90th percentile AQI 932002: 90th percentile AQI 1222003: 90th percentile AQI 932004: 90th percentile AQI 642005: 90th percentile AQI 842006: 90th percentile AQI 902007: 90th percentile AQI 1012008: 90th percentile AQI 712009: 90th percentile AQI 612010: 90th percentile AQI 842011: 90th percentile AQI 842012: 90th percentile AQI 932013: 90th percentile AQI 512014: 90th percentile AQI 582015: 90th percentile AQI 612016: 90th percentile AQI 642017: 90th percentile AQI 512018: 90th percentile AQI 482019: 90th percentile AQI 542020: 90th percentile AQI 472021: 90th percentile AQI 492022: 90th percentile AQI 502023: 90th percentile AQI 612024: 90th percentile AQI 512025: 90th percentile AQI 581980: Median AQI 211981: Median AQI 311982: Median AQI 411983: Median AQI 541984: Median AQI 491985: Median AQI 471986: Median AQI 501987: Median AQI 641988: Median AQI 641989: Median AQI 491990: Median AQI 641991: Median AQI 431992: Median AQI 441993: Median AQI 431994: Median AQI 461995: Median AQI 511996: Median AQI 451997: Median AQI 451998: Median AQI 641999: Median AQI 612000: Median AQI 442001: Median AQI 442002: Median AQI 482003: Median AQI 462004: Median AQI 422005: Median AQI 452006: Median AQI 442007: Median AQI 482008: Median AQI 442009: Median AQI 402010: Median AQI 462011: Median AQI 442012: Median AQI 442013: Median AQI 402014: Median AQI 412015: Median AQI 412016: Median AQI 392017: Median AQI 402018: Median AQI 382019: Median AQI 422020: Median AQI 372021: Median AQI 382022: Median AQI 402023: Median AQI 422024: Median AQI 442025: Median AQI 431980198519901995200020052010201520202025
  • 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
Ozone242100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025242200420000435897Ozone
20242292002900004451100Ozone
20232452013860004261140Ozone
20222432192310004050108Ozone
2021241220210000384990Ozone
2020245233120000374797Ozone
2019245208370000425484Ozone
2018125115100000384897Ozone
2017245217280000405190Ozone
20162422003930003964126Ozone
20152452033750004161115Ozone
20142371983810004158105Ozone
20132372092710004051110Ozone
201224416858162004493179Ozone
20112361725680004484129Ozone
20102411518280004684122Ozone
20092432024010004061105Ozone
20082371696350004471115Ozone
2007241136782610048101154Ozone
200624114976160004490150Ozone
20052441637470004584126Ozone
20042452014040004264150Ozone
200324214975180004693133Ozone
2002245141692960048122179Ozone
200123514276161004493169Ozone
200023816063150004487143Ozone
199921495714080061129190Ozone
199821479864081064133204Ozone
1997214131621830045100174Ozone
1996206135481850045108161Ozone
1995213105722880051122190Ozone
1994213126592260046112197Ozone
199321415046171004390182Ozone
199220813756141004484172Ozone
199120614747111004380166Ozone
1990214905839252064156204Ozone
1989211110682760049108195Ozone
19882079157301514064190242Ozone
1987211856054102064136205Ozone
19862141106131102050136207Ozone
1985206114642260047108166Ozone
1984212111702560049119172Ozone
1983179864034172054156208Ozone
198229622060151004190156Ozone
198128023035132003180169Ozone
1980686620000213871Ozone

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