EnviroNearby

Shelby County, Tennessee air quality history

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

60%
Good days in 2025
47
Median daily AQI, 2025
5
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Shelby, Tennessee on 365 days. 220 of those days (60%) were in the Good range, and the median daily AQI was 47. 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 ozone on 212 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 44% in 1980–1982 versus 46% 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 154 of 366 days1980: Moderate 142 of 366 days1980: Unhealthy for Sensitive Groups 48 of 366 days1980: Unhealthy 16 of 366 days1980: Very Unhealthy 6 of 366 days19801981: Good 156 of 365 days1981: Moderate 158 of 365 days1981: Unhealthy for Sensitive Groups 35 of 365 days1981: Unhealthy 14 of 365 days1981: Very Unhealthy 2 of 365 days1982: Good 174 of 365 days1982: Moderate 156 of 365 days1982: Unhealthy for Sensitive Groups 27 of 365 days1982: Unhealthy 8 of 365 days1983: Good 184 of 365 days1983: Moderate 122 of 365 days1983: Unhealthy for Sensitive Groups 46 of 365 days1983: Unhealthy 11 of 365 days1983: Very Unhealthy 2 of 365 days1984: Good 153 of 366 days1984: Moderate 167 of 366 days1984: Unhealthy for Sensitive Groups 38 of 366 days1984: Unhealthy 7 of 366 days1984: Very Unhealthy 1 of 366 days1985: Good 194 of 365 days1985: Moderate 135 of 365 days1985: Unhealthy for Sensitive Groups 25 of 365 days1985: Unhealthy 9 of 365 days1985: Very Unhealthy 2 of 365 days19851986: Good 163 of 365 days1986: Moderate 152 of 365 days1986: Unhealthy for Sensitive Groups 36 of 365 days1986: Unhealthy 11 of 365 days1986: Very Unhealthy 3 of 365 days1987: Good 131 of 365 days1987: Moderate 172 of 365 days1987: Unhealthy for Sensitive Groups 50 of 365 days1987: Unhealthy 10 of 365 days1987: Very Unhealthy 2 of 365 days1988: Good 143 of 366 days1988: Moderate 132 of 366 days1988: Unhealthy for Sensitive Groups 54 of 366 days1988: Unhealthy 33 of 366 days1988: Very Unhealthy 4 of 366 days1989: Good 206 of 365 days1989: Moderate 114 of 365 days1989: Unhealthy for Sensitive Groups 40 of 365 days1989: Unhealthy 4 of 365 days1989: Very Unhealthy 1 of 365 days1990: Good 184 of 365 days1990: Moderate 123 of 365 days1990: Unhealthy for Sensitive Groups 46 of 365 days1990: Unhealthy 11 of 365 days1990: Very Unhealthy 1 of 365 days19901991: Good 219 of 365 days1991: Moderate 113 of 365 days1991: Unhealthy for Sensitive Groups 28 of 365 days1991: Unhealthy 5 of 365 days1992: Good 193 of 366 days1992: Moderate 127 of 366 days1992: Unhealthy for Sensitive Groups 36 of 366 days1992: Unhealthy 10 of 366 days1993: Good 201 of 365 days1993: Moderate 125 of 365 days1993: Unhealthy for Sensitive Groups 28 of 365 days1993: Unhealthy 9 of 365 days1993: Very Unhealthy 2 of 365 days1994: Good 198 of 365 days1994: Moderate 123 of 365 days1994: Unhealthy for Sensitive Groups 38 of 365 days1994: Unhealthy 6 of 365 days1995: Good 209 of 365 days1995: Moderate 108 of 365 days1995: Unhealthy for Sensitive Groups 33 of 365 days1995: Unhealthy 12 of 365 days1995: Very Unhealthy 3 of 365 days19951996: Good 223 of 366 days1996: Moderate 99 of 366 days1996: Unhealthy for Sensitive Groups 31 of 366 days1996: Unhealthy 13 of 366 days1997: Good 202 of 365 days1997: Moderate 117 of 365 days1997: Unhealthy for Sensitive Groups 34 of 365 days1997: Unhealthy 11 of 365 days1997: Very Unhealthy 1 of 365 days1998: Good 172 of 365 days1998: Moderate 125 of 365 days1998: Unhealthy for Sensitive Groups 45 of 365 days1998: Unhealthy 19 of 365 days1998: Very Unhealthy 4 of 365 days1999: Good 67 of 365 days1999: Moderate 229 of 365 days1999: Unhealthy for Sensitive Groups 46 of 365 days1999: Unhealthy 21 of 365 days1999: Very Unhealthy 2 of 365 days2000: Good 51 of 366 days2000: Moderate 258 of 366 days2000: Unhealthy for Sensitive Groups 40 of 366 days2000: Unhealthy 16 of 366 days2000: Very Unhealthy 1 of 366 days20002001: Good 75 of 365 days2001: Moderate 248 of 365 days2001: Unhealthy for Sensitive Groups 37 of 365 days2001: Unhealthy 4 of 365 days2001: Very Unhealthy 1 of 365 days2002: Good 79 of 365 days2002: Moderate 243 of 365 days2002: Unhealthy for Sensitive Groups 35 of 365 days2002: Unhealthy 8 of 365 days2003: Good 44 of 365 days2003: Moderate 285 of 365 days2003: Unhealthy for Sensitive Groups 29 of 365 days2003: Unhealthy 7 of 365 days2004: Good 56 of 366 days2004: Moderate 294 of 366 days2004: Unhealthy for Sensitive Groups 16 of 366 days2005: Good 39 of 365 days2005: Moderate 269 of 365 days2005: Unhealthy for Sensitive Groups 51 of 365 days2005: Unhealthy 6 of 365 days20052006: Good 47 of 365 days2006: Moderate 280 of 365 days2006: Unhealthy for Sensitive Groups 35 of 365 days2006: Unhealthy 3 of 365 days2007: Good 66 of 365 days2007: Moderate 261 of 365 days2007: Unhealthy for Sensitive Groups 36 of 365 days2007: Unhealthy 2 of 365 days2008: Good 85 of 366 days2008: Moderate 267 of 366 days2008: Unhealthy for Sensitive Groups 11 of 366 days2008: Unhealthy 3 of 366 days2009: Good 126 of 365 days2009: Moderate 235 of 365 days2009: Unhealthy for Sensitive Groups 4 of 365 days2010: Good 89 of 365 days2010: Moderate 260 of 365 days2010: Unhealthy for Sensitive Groups 16 of 365 days20102011: Good 120 of 365 days2011: Moderate 222 of 365 days2011: Unhealthy for Sensitive Groups 18 of 365 days2011: Unhealthy 5 of 365 days2012: Good 126 of 366 days2012: Moderate 210 of 366 days2012: Unhealthy for Sensitive Groups 24 of 366 days2012: Unhealthy 5 of 366 days2012: Very Unhealthy 1 of 366 days2013: Good 153 of 365 days2013: Moderate 209 of 365 days2013: Unhealthy for Sensitive Groups 3 of 365 days2014: Good 147 of 365 days2014: Moderate 215 of 365 days2014: Unhealthy for Sensitive Groups 3 of 365 days2015: Good 174 of 365 days2015: Moderate 187 of 365 days2015: Unhealthy for Sensitive Groups 4 of 365 days20152016: Good 214 of 366 days2016: Moderate 146 of 366 days2016: Unhealthy for Sensitive Groups 6 of 366 days2017: Good 215 of 365 days2017: Moderate 146 of 365 days2017: Unhealthy for Sensitive Groups 3 of 365 days2017: Unhealthy 1 of 365 days2018: Good 223 of 365 days2018: Moderate 134 of 365 days2018: Unhealthy for Sensitive Groups 8 of 365 days2019: Good 152 of 365 days2019: Moderate 209 of 365 days2019: Unhealthy for Sensitive Groups 4 of 365 days2020: Good 158 of 366 days2020: Moderate 207 of 366 days2020: Unhealthy 1 of 366 days20202021: Good 209 of 365 days2021: Moderate 152 of 365 days2021: Unhealthy for Sensitive Groups 4 of 365 days2022: Good 224 of 365 days2022: Moderate 131 of 365 days2022: Unhealthy for Sensitive Groups 8 of 365 days2022: Unhealthy 2 of 365 days2023: Good 155 of 365 days2023: Moderate 201 of 365 days2023: Unhealthy for Sensitive Groups 9 of 365 days2024: Good 126 of 366 days2024: Moderate 231 of 366 days2024: Unhealthy for Sensitive Groups 6 of 366 days2024: Unhealthy 3 of 366 days2025: Good 220 of 365 days2025: Moderate 140 of 365 days2025: Unhealthy for Sensitive Groups 5 of 365 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 1221981: 90th percentile AQI 1121982: 90th percentile AQI 971983: 90th percentile AQI 1221984: 90th percentile AQI 1081985: 90th percentile AQI 1001986: 90th percentile AQI 1151987: 90th percentile AQI 1151988: 90th percentile AQI 1511989: 90th percentile AQI 1081990: 90th percentile AQI 1221991: 90th percentile AQI 1001992: 90th percentile AQI 1051993: 90th percentile AQI 1011994: 90th percentile AQI 1081995: 90th percentile AQI 1191996: 90th percentile AQI 1081997: 90th percentile AQI 1081998: 90th percentile AQI 1361999: 90th percentile AQI 1332000: 90th percentile AQI 1222001: 90th percentile AQI 1052002: 90th percentile AQI 1052003: 90th percentile AQI 1002004: 90th percentile AQI 832005: 90th percentile AQI 1122006: 90th percentile AQI 1012007: 90th percentile AQI 1052008: 90th percentile AQI 802009: 90th percentile AQI 722010: 90th percentile AQI 842011: 90th percentile AQI 882012: 90th percentile AQI 902013: 90th percentile AQI 702014: 90th percentile AQI 702015: 90th percentile AQI 672016: 90th percentile AQI 642017: 90th percentile AQI 632018: 90th percentile AQI 712019: 90th percentile AQI 672020: 90th percentile AQI 652021: 90th percentile AQI 672022: 90th percentile AQI 692023: 90th percentile AQI 742024: 90th percentile AQI 742025: 90th percentile AQI 671980: Median AQI 571981: Median AQI 541982: Median AQI 511983: Median AQI 501984: Median AQI 551985: Median AQI 491986: Median AQI 531987: Median AQI 581988: Median AQI 581989: Median AQI 471990: Median AQI 501991: Median AQI 461992: Median AQI 491993: Median AQI 481994: Median AQI 471995: Median AQI 481996: Median AQI 451997: Median AQI 481998: Median AQI 531999: Median AQI 672000: Median AQI 672001: Median AQI 632002: Median AQI 592003: Median AQI 652004: Median AQI 622005: Median AQI 662006: Median AQI 642007: Median AQI 622008: Median AQI 602009: Median AQI 552010: Median AQI 582011: Median AQI 552012: Median AQI 552013: Median AQI 522014: Median AQI 522015: Median AQI 512016: Median AQI 472017: Median AQI 462018: Median AQI 462019: Median AQI 522020: Median AQI 522021: Median AQI 482022: Median AQI 462023: Median AQI 522024: Median AQI 552025: Median AQI 471980198519901995200020052010201520202025
  • 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
Ozone21258%
Fine particles (PM2.5)15141%
Coarse particles (PM10)21%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536522014050004767147Ozone
202436612623163005574159PM2.5
202336515520190005274140PM2.5
202236522413182004669159Ozone
202136520915240004867150PM2.5
202036615820701005265153PM2.5
201936515220940005267148PM2.5
201836522313480004671133PM2.5
201736521514631004663161PM2.5
201636621414660004764136PM2.5
201536517418740005167129PM2.5
201436514721530005270136PM2.5
201336515320930005270122PM2.5
2012366126210245105590220PM2.5
2011365120222185005588174PM2.5
201036589260160005884136PM2.5
200936512623540005572119PM2.5
200836685267113006080190PM2.5
2007365662613620062105185PM2.5
2006365472803530064101200PM2.5
2005365392695160066112172PM2.5
200436656294160006283145PM2.5
2003365442852970065100172PM2.5
2002365792433580059105169PM2.5
2001365752483741063105209PM2.5
20003665125840161067122201PM2.5
19993656722946212067133205PM2.5
199836517212545194053136219Ozone
199736520211734111048108202Ozone
19963662239931130045108190Ozone
199536520910833123048119205Ozone
19943651981233860047108179Ozone
19933652011252892048101202Ozone
199236619312736100049105179Ozone
19913652191132850046100174Ozone
199036518412346111050122207Ozone
19893652061144041047108203Ozone
198836614313254334058151222Ozone
198736513117250102058115205Ozone
198636516315236113053115223CO
19853651941352592049100203CO
19843661531673871055108202CO
198336518412246112050122210CO
1982365174156278005197190CO
198136515615835142054112207Ozone
198036615414248166057122228Ozone

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