EnviroNearby

Trigg County, Kentucky air quality history

Daily Air Quality Index summaries from EPA monitors in Trigg, Kentucky, 1981–2022.

92%
Good days in 2022
39
Median daily AQI, 2022
0
Days above 100 in 2022
126
Days with an AQI in 2022 (of 365)

In 2022, EPA reported a daily Air Quality Index (AQI) for Trigg, Kentucky on 126 days. 116 of those days (92%) were in the Good range, and the median daily AQI was 39. That median is about the same as the typical monitored county in Kentucky (median 41 across 26 counties), and about the same as the typical monitored U.S. county (41). The main pollutant was ozone on 126 days. Across the years with fuller monitoring, the share of Good days rose: an average of 67% in 1982–1984 versus 95% in 2020–2022.

EPA did not report an AQI for every day of 2022 here (126 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.

The most recent year with data for this county is 2022; EPA's files for 2023–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1981) 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%1981: Good 79 of 91 days1981: Moderate 6 of 91 days1981: Unhealthy for Sensitive Groups 5 of 91 days1981: Unhealthy 1 of 91 days19811982: Good 249 of 363 days1982: Moderate 91 of 363 days1982: Unhealthy for Sensitive Groups 21 of 363 days1982: Unhealthy 2 of 363 days1983: Good 242 of 357 days1983: Moderate 68 of 357 days1983: Unhealthy for Sensitive Groups 44 of 357 days1983: Unhealthy 3 of 357 days1984: Good 136 of 213 days1984: Moderate 60 of 213 days1984: Unhealthy for Sensitive Groups 16 of 213 days1984: Unhealthy 1 of 213 days1985: Good 158 of 209 days1985: Moderate 44 of 209 days1985: Unhealthy for Sensitive Groups 7 of 209 days1986: Good 169 of 207 days1986: Moderate 34 of 207 days1986: Unhealthy for Sensitive Groups 4 of 207 days19861987: Good 102 of 183 days1987: Moderate 62 of 183 days1987: Unhealthy for Sensitive Groups 19 of 183 days1988: Good 94 of 182 days1988: Moderate 57 of 182 days1988: Unhealthy for Sensitive Groups 25 of 182 days1988: Unhealthy 4 of 182 days1988: Very Unhealthy 2 of 182 days1993: Good 123 of 129 days1993: Moderate 6 of 129 days1994: Good 230 of 342 days1994: Moderate 83 of 342 days1994: Unhealthy for Sensitive Groups 26 of 342 days1994: Unhealthy 3 of 342 days1995: Good 197 of 331 days1995: Moderate 93 of 331 days1995: Unhealthy for Sensitive Groups 34 of 331 days1995: Unhealthy 7 of 331 days19951996: Good 185 of 272 days1996: Moderate 66 of 272 days1996: Unhealthy for Sensitive Groups 19 of 272 days1996: Unhealthy 2 of 272 days1997: Good 253 of 362 days1997: Moderate 73 of 362 days1997: Unhealthy for Sensitive Groups 33 of 362 days1997: Unhealthy 3 of 362 days1998: Good 212 of 357 days1998: Moderate 96 of 357 days1998: Unhealthy for Sensitive Groups 38 of 357 days1998: Unhealthy 11 of 357 days1999: Good 189 of 339 days1999: Moderate 90 of 339 days1999: Unhealthy for Sensitive Groups 49 of 339 days1999: Unhealthy 11 of 339 days2000: Good 236 of 362 days2000: Moderate 96 of 362 days2000: Unhealthy for Sensitive Groups 29 of 362 days2000: Unhealthy 1 of 362 days20002001: Good 231 of 365 days2001: Moderate 113 of 365 days2001: Unhealthy for Sensitive Groups 21 of 365 days2002: Good 247 of 360 days2002: Moderate 89 of 360 days2002: Unhealthy for Sensitive Groups 20 of 360 days2002: Unhealthy 4 of 360 days2003: Good 235 of 362 days2003: Moderate 113 of 362 days2003: Unhealthy for Sensitive Groups 14 of 362 days2004: Good 251 of 365 days2004: Moderate 109 of 365 days2004: Unhealthy for Sensitive Groups 5 of 365 days2005: Good 214 of 361 days2005: Moderate 126 of 361 days2005: Unhealthy for Sensitive Groups 21 of 361 days20052006: Good 221 of 354 days2006: Moderate 119 of 354 days2006: Unhealthy for Sensitive Groups 14 of 354 days2007: Good 195 of 360 days2007: Moderate 133 of 360 days2007: Unhealthy for Sensitive Groups 27 of 360 days2007: Unhealthy 5 of 360 days2008: Good 241 of 362 days2008: Moderate 119 of 362 days2008: Unhealthy for Sensitive Groups 2 of 362 days2009: Good 273 of 357 days2009: Moderate 84 of 357 days2010: Good 225 of 364 days2010: Moderate 132 of 364 days2010: Unhealthy for Sensitive Groups 7 of 364 days20102011: Good 274 of 351 days2011: Moderate 76 of 351 days2011: Unhealthy for Sensitive Groups 1 of 351 days2012: Good 263 of 337 days2012: Moderate 63 of 337 days2012: Unhealthy for Sensitive Groups 10 of 337 days2012: Unhealthy 1 of 337 days2013: Good 314 of 336 days2013: Moderate 21 of 336 days2013: Unhealthy for Sensitive Groups 1 of 336 days2014: Good 311 of 347 days2014: Moderate 35 of 347 days2014: Unhealthy for Sensitive Groups 1 of 347 days2015: Good 318 of 344 days2015: Moderate 26 of 344 days20152016: Good 319 of 357 days2016: Moderate 38 of 357 days2017: Good 309 of 327 days2017: Moderate 18 of 327 days2018: Good 324 of 348 days2018: Moderate 24 of 348 days2019: Good 328 of 353 days2019: Moderate 25 of 353 days2020: Good 350 of 362 days2020: Moderate 12 of 362 days20202021: Good 330 of 345 days2021: Moderate 15 of 345 days2022: Good 116 of 126 days2022: Moderate 10 of 126 days2022
  • 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 841982: 90th percentile AQI 931983: 90th percentile AQI 1121984: 90th percentile AQI 931985: 90th percentile AQI 771986: 90th percentile AQI 671987: 90th percentile AQI 1011988: 90th percentile AQI 1151993: 90th percentile AQI 441994: 90th percentile AQI 971995: 90th percentile AQI 1051996: 90th percentile AQI 901997: 90th percentile AQI 1001998: 90th percentile AQI 1121999: 90th percentile AQI 1192000: 90th percentile AQI 972001: 90th percentile AQI 872002: 90th percentile AQI 872003: 90th percentile AQI 802004: 90th percentile AQI 672005: 90th percentile AQI 872006: 90th percentile AQI 802007: 90th percentile AQI 1002008: 90th percentile AQI 712009: 90th percentile AQI 612010: 90th percentile AQI 772011: 90th percentile AQI 672012: 90th percentile AQI 772013: 90th percentile AQI 492014: 90th percentile AQI 512015: 90th percentile AQI 492016: 90th percentile AQI 512017: 90th percentile AQI 482018: 90th percentile AQI 482019: 90th percentile AQI 492020: 90th percentile AQI 452021: 90th percentile AQI 482022: 90th percentile AQI 501981: Median AQI 311982: Median AQI 441983: Median AQI 391984: Median AQI 441985: Median AQI 411986: Median AQI 391987: Median AQI 491988: Median AQI 501993: Median AQI 241994: Median AQI 431995: Median AQI 441996: Median AQI 441997: Median AQI 411998: Median AQI 441999: Median AQI 482000: Median AQI 432001: Median AQI 442002: Median AQI 432003: Median AQI 442004: Median AQI 422005: Median AQI 462006: Median AQI 452007: Median AQI 472008: Median AQI 442009: Median AQI 402010: Median AQI 452011: Median AQI 412012: Median AQI 402013: Median AQI 362014: Median AQI 362015: Median AQI 362016: Median AQI 362017: Median AQI 372018: Median AQI 352019: Median AQI 372020: Median AQI 342021: Median AQI 352022: Median AQI 39198119861995200020052010201520202022
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2022

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
Ozone126100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2022126116100000395080Ozone
2021345330150000354874Ozone
2020362350120000344584Ozone
2019353328250000374987Ozone
2018348324240000354887Ozone
2017327309180000374887Ozone
2016357319380000365180Ozone
2015344318260000364971Ozone
20143473113510003651101Ozone
20133363142110003649115Ozone
201233726363101004077159Ozone
20113512747610004167112Ozone
201036422513270004577147Ozone
20093572738400004061100Ozone
200836224111920004471108Ozone
20073601951332750047100164Ozone
2006354221119140004580133Ozone
2005361214126210004687133Ozone
200436525110950004267136Ozone
2003362235113140004480150Ozone
200236024789204004387182Ozone
2001365231113210004487147Ozone
200036223696291004397179Ozone
19993391899049110048119200Ozone
19983572129638110044112192Ozone
1997362253733330041100166Ozone
199627218566192004490161Ozone
1995331197933470044105172Ozone
199434223083263004397182Ozone
199312912360000244464Ozone
198818294572542050115204Ozone
1987183102621900049101140Ozone
19862071693440003967133Ozone
19852091584470004177143Ozone
198421313660161004493156Ozone
1983357242684430039112187Ozone
198236324991212004493156Ozone
19819179651003184154Ozone

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.

All monitored counties in Kentucky

Source: U.S. EPA AirData, “Annual AQI by County” files for 1981–2022 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem