EnviroNearby

Greenup County, Kentucky air quality history

Daily Air Quality Index summaries from EPA monitors in Greenup, Kentucky, 1981–2025.

97%
Good days in 2025
36
Median daily AQI, 2025
0
Days above 100 in 2025
228
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Greenup, Kentucky on 228 days. 221 of those days (97%) were in the Good range, and the median daily AQI was 36. 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 228 days. Across the years with fuller monitoring, the share of Good days rose: an average of 63% in 1981–1983 versus 94% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (228 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.

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%1981: Good 120 of 166 days1981: Moderate 23 of 166 days1981: Unhealthy for Sensitive Groups 11 of 166 days1981: Unhealthy 12 of 166 days19811982: Good 114 of 181 days1982: Moderate 42 of 181 days1982: Unhealthy for Sensitive Groups 20 of 181 days1982: Unhealthy 5 of 181 days1983: Good 98 of 184 days1983: Moderate 48 of 184 days1983: Unhealthy for Sensitive Groups 24 of 184 days1983: Unhealthy 14 of 184 days1984: Good 116 of 183 days1984: Moderate 41 of 183 days1984: Unhealthy for Sensitive Groups 15 of 183 days1984: Unhealthy 9 of 183 days1984: Very Unhealthy 2 of 183 days1985: Good 132 of 213 days1985: Moderate 49 of 213 days1985: Unhealthy for Sensitive Groups 28 of 213 days1985: Unhealthy 4 of 213 days1986: Good 158 of 216 days1986: Moderate 51 of 216 days1986: Unhealthy for Sensitive Groups 7 of 216 days19861987: Good 160 of 262 days1987: Moderate 70 of 262 days1987: Unhealthy for Sensitive Groups 22 of 262 days1987: Unhealthy 8 of 262 days1987: Very Unhealthy 2 of 262 days1988: Good 132 of 207 days1988: Moderate 36 of 207 days1988: Unhealthy for Sensitive Groups 19 of 207 days1988: Unhealthy 17 of 207 days1988: Very Unhealthy 3 of 207 days1989: Good 129 of 184 days1989: Moderate 39 of 184 days1989: Unhealthy for Sensitive Groups 8 of 184 days1989: Unhealthy 8 of 184 days1990: Good 148 of 213 days1990: Moderate 47 of 213 days1990: Unhealthy for Sensitive Groups 12 of 213 days1990: Unhealthy 6 of 213 days1991: Good 139 of 208 days1991: Moderate 50 of 208 days1991: Unhealthy for Sensitive Groups 13 of 208 days1991: Unhealthy 5 of 208 days1991: Very Unhealthy 1 of 208 days19911992: Good 168 of 211 days1992: Moderate 37 of 211 days1992: Unhealthy for Sensitive Groups 6 of 211 days1993: Good 131 of 214 days1993: Moderate 61 of 214 days1993: Unhealthy for Sensitive Groups 18 of 214 days1993: Unhealthy 4 of 214 days1994: Good 127 of 206 days1994: Moderate 58 of 206 days1994: Unhealthy for Sensitive Groups 13 of 206 days1994: Unhealthy 7 of 206 days1994: Very Unhealthy 1 of 206 days1995: Good 124 of 203 days1995: Moderate 57 of 203 days1995: Unhealthy for Sensitive Groups 20 of 203 days1995: Unhealthy 2 of 203 days1996: Good 150 of 198 days1996: Moderate 36 of 198 days1996: Unhealthy for Sensitive Groups 11 of 198 days1996: Unhealthy 1 of 198 days19961997: Good 173 of 212 days1997: Moderate 30 of 212 days1997: Unhealthy for Sensitive Groups 7 of 212 days1997: Unhealthy 2 of 212 days1998: Good 103 of 210 days1998: Moderate 66 of 210 days1998: Unhealthy for Sensitive Groups 29 of 210 days1998: Unhealthy 9 of 210 days1998: Very Unhealthy 3 of 210 days1999: Good 115 of 214 days1999: Moderate 61 of 214 days1999: Unhealthy for Sensitive Groups 27 of 214 days1999: Unhealthy 10 of 214 days1999: Very Unhealthy 1 of 214 days2000: Good 155 of 241 days2000: Moderate 75 of 241 days2000: Unhealthy for Sensitive Groups 11 of 241 days2001: Good 140 of 243 days2001: Moderate 71 of 243 days2001: Unhealthy for Sensitive Groups 27 of 243 days2001: Unhealthy 5 of 243 days20012002: Good 170 of 244 days2002: Moderate 44 of 244 days2002: Unhealthy for Sensitive Groups 28 of 244 days2002: Unhealthy 2 of 244 days2003: Good 164 of 244 days2003: Moderate 67 of 244 days2003: Unhealthy for Sensitive Groups 12 of 244 days2003: Unhealthy 1 of 244 days2004: Good 185 of 245 days2004: Moderate 56 of 245 days2004: Unhealthy for Sensitive Groups 4 of 245 days2005: Good 165 of 245 days2005: Moderate 68 of 245 days2005: Unhealthy for Sensitive Groups 12 of 245 days2006: Good 120 of 189 days2006: Moderate 61 of 189 days2006: Unhealthy for Sensitive Groups 7 of 189 days2006: Unhealthy 1 of 189 days20062007: Good 147 of 240 days2007: Moderate 72 of 240 days2007: Unhealthy for Sensitive Groups 20 of 240 days2007: Unhealthy 1 of 240 days2008: Good 183 of 245 days2008: Moderate 57 of 245 days2008: Unhealthy for Sensitive Groups 5 of 245 days2009: Good 217 of 244 days2009: Moderate 27 of 244 days2010: Good 178 of 243 days2010: Moderate 61 of 243 days2010: Unhealthy for Sensitive Groups 4 of 243 days2011: Good 205 of 245 days2011: Moderate 36 of 245 days2011: Unhealthy for Sensitive Groups 3 of 245 days2011: Unhealthy 1 of 245 days20112012: Good 158 of 237 days2012: Moderate 69 of 237 days2012: Unhealthy for Sensitive Groups 9 of 237 days2012: Unhealthy 1 of 237 days2013: Good 232 of 245 days2013: Moderate 12 of 245 days2013: Unhealthy for Sensitive Groups 1 of 245 days2014: Good 217 of 244 days2014: Moderate 27 of 244 days2015: Good 222 of 242 days2015: Moderate 20 of 242 days2016: Good 225 of 245 days2016: Moderate 20 of 245 days20162017: Good 214 of 220 days2017: Moderate 6 of 220 days2018: Good 218 of 238 days2018: Moderate 19 of 238 days2018: Unhealthy for Sensitive Groups 1 of 238 days2019: Good 237 of 242 days2019: Moderate 5 of 242 days2020: Good 241 of 243 days2020: Moderate 2 of 243 days2021: Good 227 of 231 days2021: Moderate 4 of 231 days20212022: Good 230 of 243 days2022: Moderate 13 of 243 days2023: Good 221 of 241 days2023: Moderate 20 of 241 days2024: Good 221 of 240 days2024: Moderate 19 of 240 days2025: Good 221 of 228 days2025: Moderate 7 of 228 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 year0501001501981: 90th percentile AQI 1291982: 90th percentile AQI 1121983: 90th percentile AQI 1401984: 90th percentile AQI 1081985: 90th percentile AQI 1151986: 90th percentile AQI 691987: 90th percentile AQI 1081988: 90th percentile AQI 1501989: 90th percentile AQI 971990: 90th percentile AQI 971991: 90th percentile AQI 1001992: 90th percentile AQI 711993: 90th percentile AQI 1011994: 90th percentile AQI 1011995: 90th percentile AQI 1011996: 90th percentile AQI 931997: 90th percentile AQI 741998: 90th percentile AQI 1331999: 90th percentile AQI 1222000: 90th percentile AQI 872001: 90th percentile AQI 1152002: 90th percentile AQI 1122003: 90th percentile AQI 842004: 90th percentile AQI 742005: 90th percentile AQI 932006: 90th percentile AQI 802007: 90th percentile AQI 1002008: 90th percentile AQI 772009: 90th percentile AQI 512010: 90th percentile AQI 712011: 90th percentile AQI 612012: 90th percentile AQI 872013: 90th percentile AQI 472014: 90th percentile AQI 542015: 90th percentile AQI 492016: 90th percentile AQI 492017: 90th percentile AQI 462018: 90th percentile AQI 502019: 90th percentile AQI 452020: 90th percentile AQI 442021: 90th percentile AQI 462022: 90th percentile AQI 472023: 90th percentile AQI 502024: 90th percentile AQI 492025: 90th percentile AQI 461981: Median AQI 411982: Median AQI 451983: Median AQI 491984: Median AQI 451985: Median AQI 451986: Median AQI 401987: Median AQI 431988: Median AQI 431989: Median AQI 431990: Median AQI 411991: Median AQI 411992: Median AQI 411993: Median AQI 441994: Median AQI 451995: Median AQI 461996: Median AQI 421997: Median AQI 401998: Median AQI 511999: Median AQI 502000: Median AQI 452001: Median AQI 482002: Median AQI 422003: Median AQI 442004: Median AQI 422005: Median AQI 442006: Median AQI 442007: Median AQI 462008: Median AQI 432009: Median AQI 362010: Median AQI 432011: Median AQI 412012: Median AQI 462013: Median AQI 372014: Median AQI 392015: Median AQI 382016: Median AQI 372017: Median AQI 362018: Median AQI 362019: Median AQI 372020: Median AQI 332021: Median AQI 342022: Median AQI 362023: Median AQI 392024: Median AQI 402025: Median AQI 361981198619911996200120062011201620212025
  • 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
Ozone228100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202522822170000364667Ozone
2024240221190000404974Ozone
2023241221200000395084Ozone
2022243230130000364771Ozone
202123122740000344654Ozone
202024324120000334461Ozone
201924223750000374558Ozone
20182382181910003650119Ozone
201722021460000364671Ozone
2016245225200000374984Ozone
20152422222000003849100Ozone
2014244217270000395490Ozone
20132452321210003747101Ozone
20122371586991004687154Ozone
20112452053631004161151Ozone
20102431786140004371122Ozone
2009244217270000365190Ozone
20082451835750004377122Ozone
2007240147722010046100151Ozone
20061891206171004480169Ozone
200524516568120004493147Ozone
20042451855640004274115Ozone
200324416467121004484172Ozone
2002244170442820042112187Ozone
2001243140712750048115166Ozone
200024115575110004587150Ozone
19992141156127101050122201Ozone
1998210103662993051133214Ozone
19972121733072004074164Ozone
199619815036111004293172Ozone
1995203124572020046101174Ozone
1994206127581371045101204Ozone
1993214131611840044101187Ozone
19922111683760004171136Ozone
1991208139501351041100207Ozone
199021314847126004197182Ozone
19891841293988004397187Ozone
19882071323619173043150223Ozone
1987262160702282043108204Ozone
19862161585170004069143Ozone
1985213132492840045115187Ozone
1984183116411592045108205Ozone
1983184984824140049140179Ozone
1982181114422050045112177Ozone
19811661202311120041129174Ozone

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 1981–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem