EnviroNearby

Sumner County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Sumner, Tennessee, 1980–2025.

69%
Good days in 2025
44
Median daily AQI, 2025
1
Days above 100 in 2025
358
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Sumner, Tennessee on 358 days. 248 of those days (69%) were in the Good range, and the median daily AQI was 44. That median is higher than the typical monitored county in Tennessee (median 39 across 23 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 180 days. Across the years with fuller monitoring, the share of Good days fell: an average of 88% in 1980–1982 versus 67% 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%1980: Good 243 of 271 days1980: Moderate 12 of 271 days1980: Unhealthy for Sensitive Groups 8 of 271 days1980: Unhealthy 8 of 271 days19801981: Good 289 of 322 days1981: Moderate 25 of 322 days1981: Unhealthy for Sensitive Groups 6 of 322 days1981: Unhealthy 1 of 322 days1981: Very Unhealthy 1 of 322 days1982: Good 301 of 357 days1982: Moderate 35 of 357 days1982: Unhealthy for Sensitive Groups 19 of 357 days1982: Unhealthy 1 of 357 days1982: Very Unhealthy 1 of 357 days1983: Good 286 of 349 days1983: Moderate 34 of 349 days1983: Unhealthy for Sensitive Groups 14 of 349 days1983: Unhealthy 14 of 349 days1983: Very Unhealthy 1 of 349 days1984: Good 268 of 358 days1984: Moderate 51 of 358 days1984: Unhealthy for Sensitive Groups 27 of 358 days1984: Unhealthy 11 of 358 days1984: Very Unhealthy 1 of 358 days1985: Good 131 of 208 days1985: Moderate 49 of 208 days1985: Unhealthy for Sensitive Groups 22 of 208 days1985: Unhealthy 4 of 208 days1985: Very Unhealthy 2 of 208 days19851986: Good 102 of 198 days1986: Moderate 53 of 198 days1986: Unhealthy for Sensitive Groups 28 of 198 days1986: Unhealthy 13 of 198 days1986: Very Unhealthy 2 of 198 days1987: Good 97 of 198 days1987: Moderate 56 of 198 days1987: Unhealthy for Sensitive Groups 33 of 198 days1987: Unhealthy 10 of 198 days1987: Very Unhealthy 2 of 198 days1988: Good 70 of 207 days1988: Moderate 55 of 207 days1988: Unhealthy for Sensitive Groups 36 of 207 days1988: Unhealthy 28 of 207 days1988: Very Unhealthy 18 of 207 days1989: Good 102 of 214 days1989: Moderate 73 of 214 days1989: Unhealthy for Sensitive Groups 30 of 214 days1989: Unhealthy 8 of 214 days1989: Very Unhealthy 1 of 214 days1990: Good 90 of 208 days1990: Moderate 59 of 208 days1990: Unhealthy for Sensitive Groups 35 of 208 days1990: Unhealthy 21 of 208 days1990: Very Unhealthy 3 of 208 days19901991: Good 107 of 214 days1991: Moderate 64 of 214 days1991: Unhealthy for Sensitive Groups 35 of 214 days1991: Unhealthy 6 of 214 days1991: Very Unhealthy 2 of 214 days1992: Good 127 of 214 days1992: Moderate 67 of 214 days1992: Unhealthy for Sensitive Groups 14 of 214 days1992: Unhealthy 5 of 214 days1992: Very Unhealthy 1 of 214 days1993: Good 114 of 231 days1993: Moderate 66 of 231 days1993: Unhealthy for Sensitive Groups 35 of 231 days1993: Unhealthy 16 of 231 days1994: Good 101 of 214 days1994: Moderate 73 of 214 days1994: Unhealthy for Sensitive Groups 22 of 214 days1994: Unhealthy 18 of 214 days1995: Good 87 of 214 days1995: Moderate 73 of 214 days1995: Unhealthy for Sensitive Groups 37 of 214 days1995: Unhealthy 16 of 214 days1995: Very Unhealthy 1 of 214 days19951996: Good 102 of 214 days1996: Moderate 63 of 214 days1996: Unhealthy for Sensitive Groups 33 of 214 days1996: Unhealthy 15 of 214 days1996: Very Unhealthy 1 of 214 days1997: Good 106 of 212 days1997: Moderate 62 of 212 days1997: Unhealthy for Sensitive Groups 27 of 212 days1997: Unhealthy 15 of 212 days1997: Very Unhealthy 2 of 212 days1998: Good 212 of 348 days1998: Moderate 82 of 348 days1998: Unhealthy for Sensitive Groups 29 of 348 days1998: Unhealthy 21 of 348 days1998: Very Unhealthy 4 of 348 days1999: Good 121 of 323 days1999: Moderate 123 of 323 days1999: Unhealthy for Sensitive Groups 52 of 323 days1999: Unhealthy 25 of 323 days1999: Very Unhealthy 2 of 323 days2000: Good 93 of 288 days2000: Moderate 148 of 288 days2000: Unhealthy for Sensitive Groups 36 of 288 days2000: Unhealthy 10 of 288 days2000: Very Unhealthy 1 of 288 days20002001: Good 121 of 285 days2001: Moderate 128 of 285 days2001: Unhealthy for Sensitive Groups 31 of 285 days2001: Unhealthy 5 of 285 days2002: Good 126 of 287 days2002: Moderate 125 of 287 days2002: Unhealthy for Sensitive Groups 29 of 287 days2002: Unhealthy 7 of 287 days2003: Good 122 of 285 days2003: Moderate 139 of 285 days2003: Unhealthy for Sensitive Groups 20 of 285 days2003: Unhealthy 4 of 285 days2004: Good 139 of 286 days2004: Moderate 131 of 286 days2004: Unhealthy for Sensitive Groups 16 of 286 days2005: Good 92 of 285 days2005: Moderate 158 of 285 days2005: Unhealthy for Sensitive Groups 31 of 285 days2005: Unhealthy 4 of 285 days20052006: Good 116 of 285 days2006: Moderate 138 of 285 days2006: Unhealthy for Sensitive Groups 25 of 285 days2006: Unhealthy 6 of 285 days2007: Good 95 of 284 days2007: Moderate 135 of 284 days2007: Unhealthy for Sensitive Groups 50 of 284 days2007: Unhealthy 4 of 284 days2008: Good 145 of 245 days2008: Moderate 87 of 245 days2008: Unhealthy for Sensitive Groups 11 of 245 days2008: Unhealthy 2 of 245 days2009: Good 188 of 245 days2009: Moderate 54 of 245 days2009: Unhealthy for Sensitive Groups 3 of 245 days2010: Good 135 of 245 days2010: Moderate 92 of 245 days2010: Unhealthy for Sensitive Groups 17 of 245 days2010: Unhealthy 1 of 245 days20102011: Good 145 of 245 days2011: Moderate 88 of 245 days2011: Unhealthy for Sensitive Groups 11 of 245 days2011: Unhealthy 1 of 245 days2012: Good 143 of 245 days2012: Moderate 73 of 245 days2012: Unhealthy for Sensitive Groups 27 of 245 days2012: Unhealthy 2 of 245 days2013: Good 191 of 283 days2013: Moderate 92 of 283 days2014: Good 196 of 280 days2014: Moderate 83 of 280 days2014: Unhealthy for Sensitive Groups 1 of 280 days2015: Good 204 of 284 days2015: Moderate 79 of 284 days2015: Unhealthy for Sensitive Groups 1 of 284 days20152016: Good 209 of 285 days2016: Moderate 75 of 285 days2016: Unhealthy for Sensitive Groups 1 of 285 days2017: Good 221 of 324 days2017: Moderate 103 of 324 days2018: Good 253 of 346 days2018: Moderate 91 of 346 days2018: Unhealthy for Sensitive Groups 2 of 346 days2019: Good 240 of 357 days2019: Moderate 117 of 357 days2020: Good 273 of 360 days2020: Moderate 86 of 360 days2020: Unhealthy for Sensitive Groups 1 of 360 days20202021: Good 236 of 357 days2021: Moderate 119 of 357 days2021: Unhealthy for Sensitive Groups 2 of 357 days2022: Good 249 of 358 days2022: Moderate 108 of 358 days2022: Unhealthy for Sensitive Groups 1 of 358 days2023: Good 242 of 353 days2023: Moderate 104 of 353 days2023: Unhealthy for Sensitive Groups 7 of 353 days2024: Good 224 of 358 days2024: Moderate 130 of 358 days2024: Unhealthy for Sensitive Groups 4 of 358 days2025: Good 248 of 358 days2025: Moderate 109 of 358 days2025: Unhealthy for Sensitive Groups 1 of 358 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 year0501001502001980: 90th percentile AQI 511981: 90th percentile AQI 511982: 90th percentile AQI 671983: 90th percentile AQI 971984: 90th percentile AQI 1051985: 90th percentile AQI 1081986: 90th percentile AQI 1291987: 90th percentile AQI 1331988: 90th percentile AQI 1921989: 90th percentile AQI 1151990: 90th percentile AQI 1561991: 90th percentile AQI 1291992: 90th percentile AQI 1001993: 90th percentile AQI 1401994: 90th percentile AQI 1401995: 90th percentile AQI 1431996: 90th percentile AQI 1431997: 90th percentile AQI 1361998: 90th percentile AQI 1291999: 90th percentile AQI 1402000: 90th percentile AQI 1222001: 90th percentile AQI 1082002: 90th percentile AQI 1082003: 90th percentile AQI 972004: 90th percentile AQI 872005: 90th percentile AQI 1052006: 90th percentile AQI 1052007: 90th percentile AQI 1152008: 90th percentile AQI 902009: 90th percentile AQI 712010: 90th percentile AQI 972011: 90th percentile AQI 902012: 90th percentile AQI 1082013: 90th percentile AQI 642014: 90th percentile AQI 672015: 90th percentile AQI 612016: 90th percentile AQI 612017: 90th percentile AQI 612018: 90th percentile AQI 612019: 90th percentile AQI 612020: 90th percentile AQI 562021: 90th percentile AQI 622022: 90th percentile AQI 582023: 90th percentile AQI 642024: 90th percentile AQI 612025: 90th percentile AQI 621980: Median AQI 101981: Median AQI 191982: Median AQI 191983: Median AQI 221984: Median AQI 251985: Median AQI 441986: Median AQI 481987: Median AQI 511988: Median AQI 871989: Median AQI 541990: Median AQI 641991: Median AQI 511992: Median AQI 451993: Median AQI 511994: Median AQI 541995: Median AQI 641996: Median AQI 511997: Median AQI 511998: Median AQI 431999: Median AQI 622000: Median AQI 612001: Median AQI 552002: Median AQI 542003: Median AQI 542004: Median AQI 512005: Median AQI 582006: Median AQI 552007: Median AQI 602008: Median AQI 482009: Median AQI 422010: Median AQI 492011: Median AQI 472012: Median AQI 482013: Median AQI 452014: Median AQI 432015: Median AQI 422016: Median AQI 442017: Median AQI 442018: Median AQI 412019: Median AQI 442020: Median AQI 412021: Median AQI 442022: Median AQI 422023: Median AQI 452024: Median AQI 452025: Median AQI 441980198519901995200020052010201520202025
  • 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)18050%
Ozone17850%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202535824810910004462119PM2.5
202435822413040004561133PM2.5
202335324210470004564133PM2.5
202235824910810004258147PM2.5
202135723611920004462133PM2.5
20203602738610004156121PM2.5
20193572401170000446193PM2.5
20183462539120004161133PM2.5
201732422110300004461100PM2.5
20162852097510004461105Ozone
20152842047910004261112Ozone
20142801968310004367122Ozone
20132831919200004564100Ozone
2012245143732720048108179Ozone
201124514588111004790151Ozone
201024513592171004997156Ozone
20092451885430004271129Ozone
200824514587112004890161Ozone
2007284951355040060115197Ozone
20062851161382560055105182Ozone
2005285921583140058105179Ozone
2004286139131160005187147Ozone
2003285122139204005497174Ozone
20022871261252970054108169Ozone
20012851211283150055108195Ozone
20002889314836101061122203Ozone
199932312112352252062140205Ozone
19983482128229214043129206Ozone
19972121066227152051136205Ozone
19962141026333151051143202Ozone
1995214877337161064143203Ozone
19942141017322180054140200Ozone
19932311146635160051140200Ozone
1992214127671451045100202Ozone
1991214107643562051129205Ozone
1990208905935213064156209Ozone
1989214102733081054115207Ozone
19882077055362818087192222Ozone
1987198975633102051133219Ozone
19861981025328132048129205Ozone
1985208131492242044108216Ozone
19843582685127111025105210Ozone
1983349286341414102297214Ozone
198235730135191101967205Ozone
19813222892561101951206Ozone
19802712431288001051192Ozone

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 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