EnviroNearby

Wilson County, Tennessee air quality history

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

93%
Good days in 2025
38
Median daily AQI, 2025
0
Days above 100 in 2025
243
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Wilson, Tennessee on 243 days. 227 of those days (93%) were in the Good range, and the median daily AQI was 38. 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 243 days. Across the years with fuller monitoring, the share of Good days rose: an average of 58% in 1989–1991 versus 89% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (243 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.

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 46 of 79 days1988: Moderate 19 of 79 days1988: Unhealthy for Sensitive Groups 11 of 79 days1988: Unhealthy 3 of 79 days19881989: Good 121 of 179 days1989: Moderate 49 of 179 days1989: Unhealthy for Sensitive Groups 9 of 179 days1990: Good 113 of 214 days1990: Moderate 64 of 214 days1990: Unhealthy for Sensitive Groups 27 of 214 days1990: Unhealthy 9 of 214 days1990: Very Unhealthy 1 of 214 days1991: Good 108 of 206 days1991: Moderate 66 of 206 days1991: Unhealthy for Sensitive Groups 27 of 206 days1991: Unhealthy 5 of 206 days1992: Good 132 of 187 days1992: Moderate 49 of 187 days1992: Unhealthy for Sensitive Groups 6 of 187 days1993: Good 132 of 195 days1993: Moderate 53 of 195 days1993: Unhealthy for Sensitive Groups 8 of 195 days1993: Unhealthy 2 of 195 days19931994: Good 131 of 196 days1994: Moderate 55 of 196 days1994: Unhealthy for Sensitive Groups 9 of 196 days1994: Unhealthy 1 of 196 days1995: Good 112 of 213 days1995: Moderate 79 of 213 days1995: Unhealthy for Sensitive Groups 17 of 213 days1995: Unhealthy 5 of 213 days1996: Good 95 of 210 days1996: Moderate 80 of 210 days1996: Unhealthy for Sensitive Groups 27 of 210 days1996: Unhealthy 8 of 210 days1997: Good 117 of 213 days1997: Moderate 61 of 213 days1997: Unhealthy for Sensitive Groups 32 of 213 days1997: Unhealthy 3 of 213 days1998: Good 120 of 209 days1998: Moderate 53 of 209 days1998: Unhealthy for Sensitive Groups 33 of 209 days1998: Unhealthy 3 of 209 days19981999: Good 117 of 243 days1999: Moderate 62 of 243 days1999: Unhealthy for Sensitive Groups 52 of 243 days1999: Unhealthy 11 of 243 days1999: Very Unhealthy 1 of 243 days2000: Good 129 of 258 days2000: Moderate 87 of 258 days2000: Unhealthy for Sensitive Groups 37 of 258 days2000: Unhealthy 5 of 258 days2001: Good 146 of 236 days2001: Moderate 71 of 236 days2001: Unhealthy for Sensitive Groups 19 of 236 days2002: Good 148 of 239 days2002: Moderate 60 of 239 days2002: Unhealthy for Sensitive Groups 25 of 239 days2002: Unhealthy 5 of 239 days2002: Very Unhealthy 1 of 239 days2003: Good 155 of 243 days2003: Moderate 70 of 243 days2003: Unhealthy for Sensitive Groups 17 of 243 days2003: Unhealthy 1 of 243 days20032004: Good 183 of 237 days2004: Moderate 50 of 237 days2004: Unhealthy for Sensitive Groups 4 of 237 days2005: Good 154 of 236 days2005: Moderate 61 of 236 days2005: Unhealthy for Sensitive Groups 20 of 236 days2005: Unhealthy 1 of 236 days2006: Good 143 of 242 days2006: Moderate 82 of 242 days2006: Unhealthy for Sensitive Groups 16 of 242 days2006: Unhealthy 1 of 242 days2007: Good 100 of 240 days2007: Moderate 103 of 240 days2007: Unhealthy for Sensitive Groups 34 of 240 days2007: Unhealthy 3 of 240 days2008: Good 147 of 239 days2008: Moderate 77 of 239 days2008: Unhealthy for Sensitive Groups 15 of 239 days20082009: Good 198 of 238 days2009: Moderate 40 of 238 days2010: Good 153 of 238 days2010: Moderate 76 of 238 days2010: Unhealthy for Sensitive Groups 9 of 238 days2011: Good 154 of 243 days2011: Moderate 82 of 243 days2011: Unhealthy for Sensitive Groups 7 of 243 days2012: Good 166 of 238 days2012: Moderate 56 of 238 days2012: Unhealthy for Sensitive Groups 14 of 238 days2012: Unhealthy 2 of 238 days2013: Good 217 of 239 days2013: Moderate 22 of 239 days20132014: Good 214 of 238 days2014: Moderate 24 of 238 days2015: Good 211 of 244 days2015: Moderate 33 of 244 days2016: Good 186 of 225 days2016: Moderate 39 of 225 days2017: Good 218 of 236 days2017: Moderate 18 of 236 days2018: Good 158 of 191 days2018: Moderate 31 of 191 days2018: Unhealthy for Sensitive Groups 2 of 191 days20182019: Good 205 of 231 days2019: Moderate 26 of 231 days2020: Good 240 of 245 days2020: Moderate 5 of 245 days2021: Good 221 of 243 days2021: Moderate 22 of 243 days2022: Good 221 of 242 days2022: Moderate 20 of 242 days2022: Unhealthy for Sensitive Groups 1 of 242 days2023: Good 211 of 244 days2023: Moderate 29 of 244 days2023: Unhealthy for Sensitive Groups 4 of 244 days20232024: Good 216 of 245 days2024: Moderate 29 of 245 days2025: Good 227 of 243 days2025: Moderate 16 of 243 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 year0501001501988: 90th percentile AQI 1261989: 90th percentile AQI 871990: 90th percentile AQI 1291991: 90th percentile AQI 1081992: 90th percentile AQI 771993: 90th percentile AQI 801994: 90th percentile AQI 871995: 90th percentile AQI 1011996: 90th percentile AQI 1151997: 90th percentile AQI 1151998: 90th percentile AQI 1191999: 90th percentile AQI 1362000: 90th percentile AQI 1152001: 90th percentile AQI 972002: 90th percentile AQI 1082003: 90th percentile AQI 972004: 90th percentile AQI 772005: 90th percentile AQI 1002006: 90th percentile AQI 932007: 90th percentile AQI 1082008: 90th percentile AQI 932009: 90th percentile AQI 642010: 90th percentile AQI 872011: 90th percentile AQI 842012: 90th percentile AQI 902013: 90th percentile AQI 502014: 90th percentile AQI 512015: 90th percentile AQI 542016: 90th percentile AQI 612017: 90th percentile AQI 492018: 90th percentile AQI 612019: 90th percentile AQI 512020: 90th percentile AQI 452021: 90th percentile AQI 482022: 90th percentile AQI 492023: 90th percentile AQI 542024: 90th percentile AQI 512025: 90th percentile AQI 481988: Median AQI 441989: Median AQI 441990: Median AQI 491991: Median AQI 481992: Median AQI 421993: Median AQI 451994: Median AQI 451995: Median AQI 501996: Median AQI 581997: Median AQI 471998: Median AQI 471999: Median AQI 542000: Median AQI 512001: Median AQI 462002: Median AQI 462003: Median AQI 462004: Median AQI 422005: Median AQI 462006: Median AQI 472007: Median AQI 612008: Median AQI 462009: Median AQI 402010: Median AQI 462011: Median AQI 472012: Median AQI 442013: Median AQI 392014: Median AQI 392015: Median AQI 382016: Median AQI 412017: Median AQI 392018: Median AQI 382019: Median AQI 402020: Median AQI 332021: Median AQI 372022: Median AQI 392023: Median AQI 422024: Median AQI 412025: Median AQI 38198819931998200320082013201820232025
  • 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
Ozone243100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025243227160000384877Ozone
20242452162900004151100Ozone
20232442112940004254126Ozone
20222422212010003949122Ozone
2021243221220000374874Ozone
202024524050000334564Ozone
2019231205260000405180Ozone
20181911583120003861119Ozone
2017236218180000394984Ozone
2016225186390000416197Ozone
2015244211330000385493Ozone
2014238214240000395187Ozone
2013239217220000395077Ozone
201223816656142004490187Ozone
20112431548270004784133Ozone
20102381537690004687126Ozone
20092381984000004064100Ozone
200823914777150004693136Ozone
20072401001033430061108169Ozone
200624214382161004793151Ozone
2005236154612010046100154Ozone
20042371835040004277133Ozone
200324315570171004697159Ozone
2002239148602551046108203Ozone
200123614671190004697147Ozone
2000258129873750051115182Ozone
19992431176252111054136215Ozone
1998209120533330047119174Ozone
1997213117613230047115179Ozone
199621095802780058115179Ozone
1995213112791750050101179Ozone
19941961315591004587156Ozone
19931951325382004580159Ozone
19921871324960004277129Ozone
1991206108662750048108182Ozone
1990214113642791049129204Ozone
19891791214990004487126Ozone
19887946191130044126172Ozone

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