EnviroNearby

Claiborne County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Claiborne, Tennessee, 1990–2025.

97%
Good days in 2025
35
Median daily AQI, 2025
0
Days above 100 in 2025
363
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Claiborne, Tennessee on 363 days. 353 of those days (97%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in Tennessee (median 39 across 23 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 363 days. Across the years with fuller monitoring, the share of Good days rose: an average of 73% in 1990–1992 versus 95% 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%1990: Good 232 of 346 days1990: Moderate 81 of 346 days1990: Unhealthy for Sensitive Groups 25 of 346 days1990: Unhealthy 8 of 346 days19901991: Good 257 of 356 days1991: Moderate 89 of 356 days1991: Unhealthy for Sensitive Groups 9 of 356 days1991: Unhealthy 1 of 356 days1992: Good 285 of 358 days1992: Moderate 63 of 358 days1992: Unhealthy for Sensitive Groups 10 of 358 days1993: Good 257 of 355 days1993: Moderate 86 of 355 days1993: Unhealthy for Sensitive Groups 11 of 355 days1993: Unhealthy 1 of 355 days1994: Good 254 of 352 days1994: Moderate 84 of 352 days1994: Unhealthy for Sensitive Groups 12 of 352 days1994: Unhealthy 2 of 352 days1995: Good 154 of 265 days1995: Moderate 81 of 265 days1995: Unhealthy for Sensitive Groups 27 of 265 days1995: Unhealthy 3 of 265 days19951996: Good 131 of 160 days1996: Moderate 29 of 160 days1997: Good 243 of 359 days1997: Moderate 95 of 359 days1997: Unhealthy for Sensitive Groups 19 of 359 days1997: Unhealthy 2 of 359 days1998: Good 227 of 358 days1998: Moderate 94 of 358 days1998: Unhealthy for Sensitive Groups 29 of 358 days1998: Unhealthy 8 of 358 days1999: Good 223 of 362 days1999: Moderate 98 of 362 days1999: Unhealthy for Sensitive Groups 37 of 362 days1999: Unhealthy 4 of 362 days2000: Good 248 of 362 days2000: Moderate 79 of 362 days2000: Unhealthy for Sensitive Groups 29 of 362 days2000: Unhealthy 6 of 362 days20002001: Good 260 of 361 days2001: Moderate 79 of 361 days2001: Unhealthy for Sensitive Groups 20 of 361 days2001: Unhealthy 2 of 361 days2002: Good 252 of 361 days2002: Moderate 76 of 361 days2002: Unhealthy for Sensitive Groups 23 of 361 days2002: Unhealthy 10 of 361 days2003: Good 289 of 353 days2003: Moderate 59 of 353 days2003: Unhealthy for Sensitive Groups 5 of 353 days2004: Good 316 of 357 days2004: Moderate 40 of 357 days2004: Unhealthy for Sensitive Groups 1 of 357 days2005: Good 176 of 234 days2005: Moderate 50 of 234 days2005: Unhealthy for Sensitive Groups 8 of 234 days20052006: Good 234 of 324 days2006: Moderate 86 of 324 days2006: Unhealthy for Sensitive Groups 4 of 324 days2007: Good 218 of 339 days2007: Moderate 107 of 339 days2007: Unhealthy for Sensitive Groups 14 of 339 days2008: Good 292 of 360 days2008: Moderate 64 of 360 days2008: Unhealthy for Sensitive Groups 4 of 360 days2009: Good 336 of 360 days2009: Moderate 24 of 360 days2010: Good 294 of 344 days2010: Moderate 48 of 344 days2010: Unhealthy for Sensitive Groups 2 of 344 days20102011: Good 303 of 330 days2011: Moderate 27 of 330 days2012: Good 314 of 353 days2012: Moderate 37 of 353 days2012: Unhealthy for Sensitive Groups 2 of 353 days2013: Good 331 of 347 days2013: Moderate 16 of 347 days2014: Good 328 of 358 days2014: Moderate 30 of 358 days2015: Good 341 of 363 days2015: Moderate 22 of 363 days20152016: Good 321 of 344 days2016: Moderate 22 of 344 days2016: Unhealthy for Sensitive Groups 1 of 344 days2017: Good 324 of 344 days2017: Moderate 20 of 344 days2018: Good 335 of 355 days2018: Moderate 20 of 355 days2019: Good 325 of 346 days2019: Moderate 21 of 346 days2020: Good 343 of 345 days2020: Moderate 2 of 345 days20202021: Good 339 of 357 days2021: Moderate 18 of 357 days2022: Good 355 of 363 days2022: Moderate 8 of 363 days2023: Good 324 of 351 days2023: Moderate 25 of 351 days2023: Unhealthy for Sensitive Groups 2 of 351 days2024: Good 336 of 350 days2024: Moderate 14 of 350 days2025: Good 353 of 363 days2025: Moderate 10 of 363 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 year0501001501990: 90th percentile AQI 1001991: 90th percentile AQI 801992: 90th percentile AQI 741993: 90th percentile AQI 801994: 90th percentile AQI 841995: 90th percentile AQI 1011996: 90th percentile AQI 641997: 90th percentile AQI 901998: 90th percentile AQI 1011999: 90th percentile AQI 1082000: 90th percentile AQI 1002001: 90th percentile AQI 842002: 90th percentile AQI 972003: 90th percentile AQI 642004: 90th percentile AQI 542005: 90th percentile AQI 772006: 90th percentile AQI 772007: 90th percentile AQI 842008: 90th percentile AQI 642009: 90th percentile AQI 482010: 90th percentile AQI 582011: 90th percentile AQI 502012: 90th percentile AQI 512013: 90th percentile AQI 462014: 90th percentile AQI 502015: 90th percentile AQI 492016: 90th percentile AQI 482017: 90th percentile AQI 472018: 90th percentile AQI 472019: 90th percentile AQI 472020: 90th percentile AQI 442021: 90th percentile AQI 462022: 90th percentile AQI 442023: 90th percentile AQI 492024: 90th percentile AQI 462025: 90th percentile AQI 451990: Median AQI 441991: Median AQI 421992: Median AQI 391993: Median AQI 391994: Median AQI 431995: Median AQI 471996: Median AQI 331997: Median AQI 421998: Median AQI 441999: Median AQI 442000: Median AQI 442001: Median AQI 432002: Median AQI 402003: Median AQI 372004: Median AQI 362005: Median AQI 412006: Median AQI 412007: Median AQI 442008: Median AQI 392009: Median AQI 342010: Median AQI 372011: Median AQI 372012: Median AQI 372013: Median AQI 362014: Median AQI 352015: Median AQI 352016: Median AQI 382017: Median AQI 362018: Median AQI 342019: Median AQI 352020: Median AQI 322021: Median AQI 342022: Median AQI 342023: Median AQI 382024: Median AQI 362025: Median AQI 3519901995200020052010201520202025
  • 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
Ozone363100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253633531000003545100Ozone
2024350336140000364667Ozone
20233513242520003849105Ozone
202236335580000344474Ozone
2021357339180000344671Ozone
202034534320000324451Ozone
2019346325210000354780Ozone
2018355335200000344787Ozone
2017344324200000364787Ozone
20163443212210003848108Ozone
2015363341220000354984Ozone
2014358328300000355090Ozone
2013347331160000364680Ozone
20123533143720003751129Ozone
2011330303270000375093Ozone
20103442944820003758112Ozone
2009360336240000344887Ozone
20083602926440003964115Ozone
2007339218107140004484136Ozone
20063242348640004177115Ozone
20052341765080004177133Ozone
20043573164010003654115Ozone
20033532895950003764126Ozone
2002361252762310004097185Ozone
200136126079202004384161Ozone
2000362248792960044100197Ozone
1999362223983740044108159Ozone
1998358227942980044101190Ozone
199735924395192004290169Ozone
19961601312900003364100Ozone
1995265154812730047101179Ozone
199435225484122004384190Ozone
199335525786111003980164Ozone
199235828563100003974147Ozone
19913562578991004280154Ozone
1990346232812580044100182Ozone

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 Tennessee with a similar median AQI in 2025

All monitored counties in Tennessee

Source: U.S. EPA AirData, “Annual AQI by County” files for 1990–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem