EnviroNearby

Sevier County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Sevier, Tennessee, 1988–2025.

97%
Good days in 2025
40
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 Sevier, Tennessee on 363 days. 351 of those days (97%) were in the Good range, and the median daily AQI was 40. That median is about the same as the typical monitored county in Tennessee (median 39 across 23 counties), and about the same as 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 57% in 1989–1991 versus 84% in 2023–2025.

Years with fewer than 120 monitored days (1988) 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%1988: Good 28 of 71 days1988: Moderate 23 of 71 days1988: Unhealthy for Sensitive Groups 15 of 71 days1988: Unhealthy 5 of 71 days19881989: Good 102 of 191 days1989: Moderate 62 of 191 days1989: Unhealthy for Sensitive Groups 27 of 191 days1990: Good 157 of 256 days1990: Moderate 71 of 256 days1990: Unhealthy for Sensitive Groups 24 of 256 days1990: Unhealthy 4 of 256 days1991: Good 184 of 331 days1991: Moderate 104 of 331 days1991: Unhealthy for Sensitive Groups 42 of 331 days1991: Unhealthy 1 of 331 days1992: Good 181 of 242 days1992: Moderate 52 of 242 days1992: Unhealthy for Sensitive Groups 9 of 242 days1993: Good 181 of 346 days1993: Moderate 119 of 346 days1993: Unhealthy for Sensitive Groups 39 of 346 days1993: Unhealthy 7 of 346 days19931994: Good 171 of 329 days1994: Moderate 112 of 329 days1994: Unhealthy for Sensitive Groups 42 of 329 days1994: Unhealthy 3 of 329 days1994: Very Unhealthy 1 of 329 days1995: Good 85 of 264 days1995: Moderate 102 of 264 days1995: Unhealthy for Sensitive Groups 62 of 264 days1995: Unhealthy 14 of 264 days1995: Very Unhealthy 1 of 264 days1996: Good 133 of 309 days1996: Moderate 103 of 309 days1996: Unhealthy for Sensitive Groups 60 of 309 days1996: Unhealthy 13 of 309 days1997: Good 161 of 354 days1997: Moderate 112 of 354 days1997: Unhealthy for Sensitive Groups 61 of 354 days1997: Unhealthy 20 of 354 days1998: Good 114 of 329 days1998: Moderate 107 of 329 days1998: Unhealthy for Sensitive Groups 71 of 329 days1998: Unhealthy 29 of 329 days1998: Very Unhealthy 8 of 329 days19981999: Good 143 of 353 days1999: Moderate 98 of 353 days1999: Unhealthy for Sensitive Groups 71 of 353 days1999: Unhealthy 40 of 353 days1999: Very Unhealthy 1 of 353 days2000: Good 139 of 365 days2000: Moderate 121 of 365 days2000: Unhealthy for Sensitive Groups 78 of 365 days2000: Unhealthy 25 of 365 days2000: Very Unhealthy 2 of 365 days2001: Good 140 of 363 days2001: Moderate 149 of 363 days2001: Unhealthy for Sensitive Groups 61 of 363 days2001: Unhealthy 13 of 363 days2002: Good 178 of 362 days2002: Moderate 105 of 362 days2002: Unhealthy for Sensitive Groups 41 of 362 days2002: Unhealthy 37 of 362 days2002: Very Unhealthy 1 of 362 days2003: Good 195 of 363 days2003: Moderate 135 of 363 days2003: Unhealthy for Sensitive Groups 30 of 363 days2003: Unhealthy 3 of 363 days20032004: Good 201 of 361 days2004: Moderate 142 of 361 days2004: Unhealthy for Sensitive Groups 17 of 361 days2004: Unhealthy 1 of 361 days2005: Good 204 of 361 days2005: Moderate 125 of 361 days2005: Unhealthy for Sensitive Groups 29 of 361 days2005: Unhealthy 3 of 361 days2006: Good 184 of 360 days2006: Moderate 133 of 360 days2006: Unhealthy for Sensitive Groups 38 of 360 days2006: Unhealthy 5 of 360 days2007: Good 164 of 362 days2007: Moderate 134 of 362 days2007: Unhealthy for Sensitive Groups 52 of 362 days2007: Unhealthy 12 of 362 days2008: Good 201 of 365 days2008: Moderate 135 of 365 days2008: Unhealthy for Sensitive Groups 27 of 365 days2008: Unhealthy 2 of 365 days20082009: Good 239 of 365 days2009: Moderate 121 of 365 days2009: Unhealthy for Sensitive Groups 5 of 365 days2010: Good 183 of 363 days2010: Moderate 153 of 363 days2010: Unhealthy for Sensitive Groups 27 of 363 days2011: Good 192 of 363 days2011: Moderate 148 of 363 days2011: Unhealthy for Sensitive Groups 22 of 363 days2011: Unhealthy 1 of 363 days2012: Good 238 of 365 days2012: Moderate 122 of 365 days2012: Unhealthy for Sensitive Groups 3 of 365 days2012: Unhealthy 2 of 365 days2013: Good 299 of 364 days2013: Moderate 65 of 364 days20132014: Good 282 of 358 days2014: Moderate 76 of 358 days2015: Good 302 of 364 days2015: Moderate 61 of 364 days2015: Unhealthy for Sensitive Groups 1 of 364 days2016: Good 297 of 358 days2016: Moderate 58 of 358 days2016: Unhealthy for Sensitive Groups 3 of 358 days2017: Good 301 of 364 days2017: Moderate 63 of 364 days2018: Good 306 of 364 days2018: Moderate 54 of 364 days2018: Unhealthy for Sensitive Groups 4 of 364 days20182019: Good 287 of 364 days2019: Moderate 77 of 364 days2020: Good 336 of 363 days2020: Moderate 26 of 363 days2020: Unhealthy for Sensitive Groups 1 of 363 days2021: Good 310 of 363 days2021: Moderate 53 of 363 days2022: Good 262 of 310 days2022: Moderate 48 of 310 days2023: Good 205 of 268 days2023: Moderate 60 of 268 days2023: Unhealthy for Sensitive Groups 3 of 268 days20232024: Good 289 of 362 days2024: Moderate 73 of 362 days2025: Good 351 of 363 days2025: Moderate 12 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 year0501001502001988: 90th percentile AQI 1401989: 90th percentile AQI 1051990: 90th percentile AQI 1081991: 90th percentile AQI 1081992: 90th percentile AQI 741993: 90th percentile AQI 1051994: 90th percentile AQI 1121995: 90th percentile AQI 1291996: 90th percentile AQI 1261997: 90th percentile AQI 1361998: 90th percentile AQI 1561999: 90th percentile AQI 1512000: 90th percentile AQI 1432001: 90th percentile AQI 1262002: 90th percentile AQI 1512003: 90th percentile AQI 1002004: 90th percentile AQI 902005: 90th percentile AQI 1002006: 90th percentile AQI 1052007: 90th percentile AQI 1222008: 90th percentile AQI 932009: 90th percentile AQI 742010: 90th percentile AQI 972011: 90th percentile AQI 932012: 90th percentile AQI 802013: 90th percentile AQI 582014: 90th percentile AQI 672015: 90th percentile AQI 582016: 90th percentile AQI 582017: 90th percentile AQI 612018: 90th percentile AQI 642019: 90th percentile AQI 612020: 90th percentile AQI 492021: 90th percentile AQI 542022: 90th percentile AQI 542023: 90th percentile AQI 642024: 90th percentile AQI 612025: 90th percentile AQI 471988: Median AQI 671989: Median AQI 501990: Median AQI 481991: Median AQI 481992: Median AQI 421993: Median AQI 501994: Median AQI 501995: Median AQI 741996: Median AQI 611997: Median AQI 541998: Median AQI 771999: Median AQI 642000: Median AQI 672001: Median AQI 612002: Median AQI 512003: Median AQI 492004: Median AQI 482005: Median AQI 472006: Median AQI 502007: Median AQI 582008: Median AQI 492009: Median AQI 472010: Median AQI 502011: Median AQI 502012: Median AQI 462013: Median AQI 442014: Median AQI 442015: Median AQI 432016: Median AQI 442017: Median AQI 442018: Median AQI 432019: Median AQI 442020: Median AQI 402021: Median AQI 422022: Median AQI 442023: Median AQI 452024: Median AQI 442025: Median AQI 40198819931998200320082013201820232025
  • 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
2025363351120000404784Ozone
2024362289730000446193Ozone
20232682056030004564115Ozone
2022310262480000445493Ozone
2021363310530000425493Ozone
20203633362610004049105Ozone
2019364287770000446190Ozone
20183643065440004364115Ozone
2017364301630000446190Ozone
20163582975830004458112Ozone
20153643026110004358112Ozone
2014358282760000446797Ozone
20133642996500004458100Ozone
201236523812232004680154Ozone
2011363192148221005093151Ozone
2010363183153270005097147Ozone
200936523912150004774112Ozone
2008365201135272004993151Ozone
200736216413452120058122166Ozone
20063601841333850050105159Ozone
20053612041252930047100156Ozone
2004361201142171004890151Ozone
20033631951353030049100182Ozone
200236217810541371051151202Ozone
200136314014961130061126195Ozone
200036513912178252067143206Ozone
19993531439871401064151202Ozone
199832911410771298077156208Ozone
199735416111261200054136197Ozone
199630913310360130061126172Ozone
19952648510262141074129203Ozone
19943291711124231050112206Ozone
19933461811193970050105187Ozone
19922421815290004274129Ozone
19913311841044210048108151Ozone
1990256157712440048108172Ozone
1989191102622700050105147Ozone
19887128231550067140187Ozone

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 1988–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem