EnviroNearby

Daviess County, Kentucky air quality history

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

62%
Good days in 2025
43
Median daily AQI, 2025
0
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Daviess, Kentucky on 365 days. 226 of those days (62%) 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 fine particles (PM2.5) on 263 days. Across the years with fuller monitoring, the share of Good days fell: an average of 79% in 1980–1982 versus 57% in 2022–2025.

Years with fewer than 120 monitored days (2024) 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 285 of 365 days1980: Moderate 50 of 365 days1980: Unhealthy for Sensitive Groups 24 of 365 days1980: Unhealthy 5 of 365 days1980: Very Unhealthy 1 of 365 days19801981: Good 306 of 351 days1981: Moderate 34 of 351 days1981: Unhealthy for Sensitive Groups 11 of 351 days1982: Good 257 of 365 days1982: Moderate 75 of 365 days1982: Unhealthy for Sensitive Groups 27 of 365 days1982: Unhealthy 6 of 365 days1983: Good 244 of 365 days1983: Moderate 68 of 365 days1983: Unhealthy for Sensitive Groups 33 of 365 days1983: Unhealthy 17 of 365 days1983: Very Unhealthy 3 of 365 days1984: Good 275 of 366 days1984: Moderate 68 of 366 days1984: Unhealthy for Sensitive Groups 21 of 366 days1984: Unhealthy 2 of 366 days1985: Good 286 of 365 days1985: Moderate 56 of 365 days1985: Unhealthy for Sensitive Groups 21 of 365 days1985: Unhealthy 2 of 365 days19851986: Good 277 of 365 days1986: Moderate 58 of 365 days1986: Unhealthy for Sensitive Groups 22 of 365 days1986: Unhealthy 7 of 365 days1986: Very Unhealthy 1 of 365 days1987: Good 245 of 365 days1987: Moderate 70 of 365 days1987: Unhealthy for Sensitive Groups 34 of 365 days1987: Unhealthy 15 of 365 days1987: Very Unhealthy 1 of 365 days1988: Good 253 of 366 days1988: Moderate 57 of 366 days1988: Unhealthy for Sensitive Groups 27 of 366 days1988: Unhealthy 21 of 366 days1988: Very Unhealthy 8 of 366 days1989: Good 279 of 364 days1989: Moderate 63 of 364 days1989: Unhealthy for Sensitive Groups 20 of 364 days1989: Unhealthy 2 of 364 days1990: Good 285 of 365 days1990: Moderate 56 of 365 days1990: Unhealthy for Sensitive Groups 20 of 365 days1990: Unhealthy 4 of 365 days19901991: Good 324 of 364 days1991: Moderate 34 of 364 days1991: Unhealthy for Sensitive Groups 6 of 364 days1992: Good 300 of 366 days1992: Moderate 60 of 366 days1992: Unhealthy for Sensitive Groups 6 of 366 days1993: Good 289 of 365 days1993: Moderate 52 of 365 days1993: Unhealthy for Sensitive Groups 22 of 365 days1993: Unhealthy 2 of 365 days1994: Good 276 of 365 days1994: Moderate 59 of 365 days1994: Unhealthy for Sensitive Groups 25 of 365 days1994: Unhealthy 5 of 365 days1995: Good 265 of 365 days1995: Moderate 72 of 365 days1995: Unhealthy for Sensitive Groups 24 of 365 days1995: Unhealthy 4 of 365 days19951996: Good 291 of 366 days1996: Moderate 53 of 366 days1996: Unhealthy for Sensitive Groups 18 of 366 days1996: Unhealthy 4 of 366 days1997: Good 273 of 364 days1997: Moderate 63 of 364 days1997: Unhealthy for Sensitive Groups 23 of 364 days1997: Unhealthy 5 of 364 days1998: Good 261 of 365 days1998: Moderate 74 of 365 days1998: Unhealthy for Sensitive Groups 26 of 365 days1998: Unhealthy 3 of 365 days1998: Very Unhealthy 1 of 365 days1999: Good 200 of 365 days1999: Moderate 116 of 365 days1999: Unhealthy for Sensitive Groups 41 of 365 days1999: Unhealthy 8 of 365 days2000: Good 247 of 364 days2000: Moderate 102 of 364 days2000: Unhealthy for Sensitive Groups 15 of 364 days20002001: Good 229 of 364 days2001: Moderate 124 of 364 days2001: Unhealthy for Sensitive Groups 10 of 364 days2001: Unhealthy 1 of 364 days2002: Good 213 of 365 days2002: Moderate 125 of 365 days2002: Unhealthy for Sensitive Groups 22 of 365 days2002: Unhealthy 5 of 365 days2003: Good 242 of 365 days2003: Moderate 117 of 365 days2003: Unhealthy for Sensitive Groups 6 of 365 days2004: Good 252 of 366 days2004: Moderate 113 of 366 days2004: Unhealthy for Sensitive Groups 1 of 366 days2005: Good 196 of 364 days2005: Moderate 132 of 364 days2005: Unhealthy for Sensitive Groups 34 of 364 days2005: Unhealthy 2 of 364 days20052006: Good 229 of 359 days2006: Moderate 120 of 359 days2006: Unhealthy for Sensitive Groups 9 of 359 days2006: Unhealthy 1 of 359 days2007: Good 126 of 365 days2007: Moderate 202 of 365 days2007: Unhealthy for Sensitive Groups 33 of 365 days2007: Unhealthy 4 of 365 days2008: Good 155 of 358 days2008: Moderate 198 of 358 days2008: Unhealthy for Sensitive Groups 5 of 358 days2009: Good 162 of 365 days2009: Moderate 202 of 365 days2009: Unhealthy for Sensitive Groups 1 of 365 days2010: Good 115 of 364 days2010: Moderate 242 of 364 days2010: Unhealthy for Sensitive Groups 7 of 364 days20102011: Good 164 of 365 days2011: Moderate 187 of 365 days2011: Unhealthy for Sensitive Groups 14 of 365 days2012: Good 191 of 366 days2012: Moderate 151 of 366 days2012: Unhealthy for Sensitive Groups 20 of 366 days2012: Unhealthy 4 of 366 days2013: Good 215 of 365 days2013: Moderate 150 of 365 days2014: Good 225 of 365 days2014: Moderate 140 of 365 days2015: Good 170 of 365 days2015: Moderate 192 of 365 days2015: Unhealthy for Sensitive Groups 3 of 365 days20152016: Good 127 of 366 days2016: Moderate 237 of 366 days2016: Unhealthy for Sensitive Groups 1 of 366 days2016: Unhealthy 1 of 366 days2017: Good 165 of 364 days2017: Moderate 199 of 364 days2018: Good 206 of 357 days2018: Moderate 150 of 357 days2018: Unhealthy for Sensitive Groups 1 of 357 days2019: Good 220 of 364 days2019: Moderate 143 of 364 days2019: Unhealthy for Sensitive Groups 1 of 364 days2020: Good 254 of 366 days2020: Moderate 111 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days20202021: Good 200 of 363 days2021: Moderate 163 of 363 days2022: Good 230 of 365 days2022: Moderate 135 of 365 days2023: Good 99 of 218 days2023: Moderate 110 of 218 days2023: Unhealthy for Sensitive Groups 8 of 218 days2023: Unhealthy 1 of 218 days2024: Good 31 of 40 days2024: Moderate 9 of 40 days2025: Good 226 of 365 days2025: Moderate 139 of 365 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 901981: 90th percentile AQI 611982: 90th percentile AQI 971983: 90th percentile AQI 1221984: 90th percentile AQI 801985: 90th percentile AQI 801986: 90th percentile AQI 901987: 90th percentile AQI 1191988: 90th percentile AQI 1191989: 90th percentile AQI 871990: 90th percentile AQI 871991: 90th percentile AQI 511992: 90th percentile AQI 641993: 90th percentile AQI 801994: 90th percentile AQI 931995: 90th percentile AQI 901996: 90th percentile AQI 801997: 90th percentile AQI 901998: 90th percentile AQI 931999: 90th percentile AQI 1082000: 90th percentile AQI 772001: 90th percentile AQI 772002: 90th percentile AQI 882003: 90th percentile AQI 732004: 90th percentile AQI 672005: 90th percentile AQI 1002006: 90th percentile AQI 802007: 90th percentile AQI 1012008: 90th percentile AQI 742009: 90th percentile AQI 722010: 90th percentile AQI 802011: 90th percentile AQI 802012: 90th percentile AQI 872013: 90th percentile AQI 642014: 90th percentile AQI 622015: 90th percentile AQI 702016: 90th percentile AQI 672017: 90th percentile AQI 642018: 90th percentile AQI 632019: 90th percentile AQI 632020: 90th percentile AQI 592021: 90th percentile AQI 682022: 90th percentile AQI 612023: 90th percentile AQI 772024: 90th percentile AQI 542025: 90th percentile AQI 611980: Median AQI 311981: Median AQI 321982: Median AQI 411983: Median AQI 361984: Median AQI 381985: Median AQI 331986: Median AQI 351987: Median AQI 411988: Median AQI 381989: Median AQI 371990: Median AQI 341991: Median AQI 331992: Median AQI 351993: Median AQI 361994: Median AQI 361995: Median AQI 351996: Median AQI 341997: Median AQI 351998: Median AQI 351999: Median AQI 462000: Median AQI 392001: Median AQI 422002: Median AQI 422003: Median AQI 392004: Median AQI 402005: Median AQI 472006: Median AQI 422007: Median AQI 572008: Median AQI 532009: Median AQI 522010: Median AQI 572011: Median AQI 522012: Median AQI 492013: Median AQI 472014: Median AQI 442015: Median AQI 522016: Median AQI 542017: Median AQI 522018: Median AQI 462019: Median AQI 462020: Median AQI 432021: Median AQI 482022: Median AQI 462023: Median AQI 512024: Median AQI 372025: 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
Fine particles (PM2.5)26372%
Ozone10228%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652261390000436184PM2.5
2024403190000375462PM2.5
20232189911081005177170PM2.5
20223652301350000466198PM2.5
20213632001630000486899PM2.5
202036625411110004359105PM2.5
201936422014310004663101PM2.5
201835720615010004663112PM2.5
20173641651990000526493PM2.5
201636612723711005467156PM2.5
201536517019230005270113PM2.5
201436522514000004462100PM2.5
20133652151500000476493PM2.5
2012366191151204004987190PM2.5
2011365164187140005280147PM2.5
201036411524270005780133PM2.5
200936516220210005272105PM2.5
200835815519850005374133PM2.5
20073651262023340057101174PM2.5
200635922912091004280161Ozone
20053641961323420047100154Ozone
200436625211310004067112Ozone
200336524211760003973126Ozone
2002365213125225004288190Ozone
2001364229124101004277172Ozone
2000364247102150003977119Ozone
19993652001164180046108169Ozone
199836526174263103593204Ozone
199736427363235003590182Ozone
199636629153184003480177Ozone
199536526572244003590177Ozone
199436527659255003693185Ozone
199336528952222003680187Ozone
19923663006060003564136Ozone
19913643243460003351143Ozone
199036528556204003487187Ozone
198936427963202003787156Ozone
19883662535727218038119227Ozone
19873652457034151041119201Ozone
198636527758227103590207Ozone
198536528656212003380177Ozone
198436627568212003880156Ozone
19833652446833173036122212Ozone
198236525775276004197187Ozone
198135130634110003261133Ozone
198036528550245103190209Ozone

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