EnviroNearby

Blount County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Blount, Tennessee, 1984–2025.

72%
Good days in 2025
44
Median daily AQI, 2025
1
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 Blount, Tennessee on 365 days. 261 of those days (72%) 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 ozone on 183 days. Across the years with fuller monitoring, the share of Good days rose: an average of 42% in 1984–1986 versus 64% in 2023–2025.

Years with fewer than 120 monitored days (1987) 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%1984: Good 145 of 264 days1984: Moderate 76 of 264 days1984: Unhealthy for Sensitive Groups 34 of 264 days1984: Unhealthy 9 of 264 days19841985: Good 58 of 170 days1985: Moderate 59 of 170 days1985: Unhealthy for Sensitive Groups 43 of 170 days1985: Unhealthy 10 of 170 days1986: Good 78 of 211 days1986: Moderate 75 of 211 days1986: Unhealthy for Sensitive Groups 40 of 211 days1986: Unhealthy 18 of 211 days1987: Good 54 of 55 days1987: Moderate 1 of 55 days1988: Good 121 of 210 days1988: Moderate 76 of 210 days1988: Unhealthy for Sensitive Groups 11 of 210 days1988: Unhealthy 1 of 210 days1988: Very Unhealthy 1 of 210 days1989: Good 181 of 327 days1989: Moderate 120 of 327 days1989: Unhealthy for Sensitive Groups 24 of 327 days1989: Unhealthy 2 of 327 days19891990: Good 177 of 309 days1990: Moderate 92 of 309 days1990: Unhealthy for Sensitive Groups 35 of 309 days1990: Unhealthy 5 of 309 days1991: Good 218 of 342 days1991: Moderate 110 of 342 days1991: Unhealthy for Sensitive Groups 12 of 342 days1991: Unhealthy 2 of 342 days1992: Good 229 of 358 days1992: Moderate 109 of 358 days1992: Unhealthy for Sensitive Groups 16 of 358 days1992: Unhealthy 4 of 358 days1993: Good 181 of 337 days1993: Moderate 121 of 337 days1993: Unhealthy for Sensitive Groups 31 of 337 days1993: Unhealthy 4 of 337 days1994: Good 202 of 352 days1994: Moderate 114 of 352 days1994: Unhealthy for Sensitive Groups 29 of 352 days1994: Unhealthy 6 of 352 days1994: Very Unhealthy 1 of 352 days19941995: Good 181 of 355 days1995: Moderate 106 of 355 days1995: Unhealthy for Sensitive Groups 50 of 355 days1995: Unhealthy 15 of 355 days1995: Very Unhealthy 3 of 355 days1996: Good 185 of 362 days1996: Moderate 121 of 362 days1996: Unhealthy for Sensitive Groups 48 of 362 days1996: Unhealthy 8 of 362 days1997: Good 166 of 349 days1997: Moderate 117 of 349 days1997: Unhealthy for Sensitive Groups 48 of 349 days1997: Unhealthy 16 of 349 days1997: Very Unhealthy 2 of 349 days1998: Good 166 of 359 days1998: Moderate 115 of 359 days1998: Unhealthy for Sensitive Groups 45 of 359 days1998: Unhealthy 28 of 359 days1998: Very Unhealthy 5 of 359 days1999: Good 116 of 365 days1999: Moderate 146 of 365 days1999: Unhealthy for Sensitive Groups 61 of 365 days1999: Unhealthy 37 of 365 days1999: Very Unhealthy 5 of 365 days19992000: Good 134 of 365 days2000: Moderate 166 of 365 days2000: Unhealthy for Sensitive Groups 54 of 365 days2000: Unhealthy 11 of 365 days2001: Good 173 of 364 days2001: Moderate 147 of 364 days2001: Unhealthy for Sensitive Groups 40 of 364 days2001: Unhealthy 4 of 364 days2002: Good 175 of 365 days2002: Moderate 121 of 365 days2002: Unhealthy for Sensitive Groups 40 of 365 days2002: Unhealthy 28 of 365 days2002: Very Unhealthy 1 of 365 days2003: Good 182 of 364 days2003: Moderate 140 of 364 days2003: Unhealthy for Sensitive Groups 34 of 364 days2003: Unhealthy 8 of 364 days2004: Good 177 of 362 days2004: Moderate 162 of 362 days2004: Unhealthy for Sensitive Groups 22 of 362 days2004: Unhealthy 1 of 362 days20042005: Good 169 of 364 days2005: Moderate 147 of 364 days2005: Unhealthy for Sensitive Groups 44 of 364 days2005: Unhealthy 4 of 364 days2006: Good 168 of 364 days2006: Moderate 160 of 364 days2006: Unhealthy for Sensitive Groups 33 of 364 days2006: Unhealthy 3 of 364 days2007: Good 154 of 365 days2007: Moderate 158 of 365 days2007: Unhealthy for Sensitive Groups 46 of 365 days2007: Unhealthy 7 of 365 days2008: Good 212 of 366 days2008: Moderate 122 of 366 days2008: Unhealthy for Sensitive Groups 31 of 366 days2008: Unhealthy 1 of 366 days2009: Good 280 of 365 days2009: Moderate 83 of 365 days2009: Unhealthy for Sensitive Groups 2 of 365 days20092010: Good 204 of 365 days2010: Moderate 131 of 365 days2010: Unhealthy for Sensitive Groups 30 of 365 days2011: Good 206 of 365 days2011: Moderate 126 of 365 days2011: Unhealthy for Sensitive Groups 32 of 365 days2011: Unhealthy 1 of 365 days2012: Good 250 of 366 days2012: Moderate 109 of 366 days2012: Unhealthy for Sensitive Groups 7 of 366 days2013: Good 282 of 365 days2013: Moderate 82 of 365 days2013: Unhealthy for Sensitive Groups 1 of 365 days2014: Good 259 of 364 days2014: Moderate 105 of 364 days20142015: Good 284 of 364 days2015: Moderate 79 of 364 days2015: Unhealthy for Sensitive Groups 1 of 364 days2016: Good 273 of 366 days2016: Moderate 87 of 366 days2016: Unhealthy for Sensitive Groups 4 of 366 days2016: Unhealthy 2 of 366 days2017: Good 197 of 365 days2017: Moderate 167 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days2018: Good 205 of 365 days2018: Moderate 159 of 365 days2018: Unhealthy for Sensitive Groups 1 of 365 days2019: Good 223 of 365 days2019: Moderate 140 of 365 days2019: Unhealthy for Sensitive Groups 2 of 365 days20192020: Good 273 of 366 days2020: Moderate 93 of 366 days2021: Good 231 of 365 days2021: Moderate 132 of 365 days2021: Unhealthy for Sensitive Groups 2 of 365 days2022: Good 238 of 365 days2022: Moderate 126 of 365 days2022: Unhealthy for Sensitive Groups 1 of 365 days2023: Good 224 of 365 days2023: Moderate 133 of 365 days2023: Unhealthy for Sensitive Groups 8 of 365 days2024: Good 221 of 366 days2024: Moderate 145 of 366 days20242025: Good 261 of 365 days2025: Moderate 103 of 365 days2025: Unhealthy for Sensitive Groups 1 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 year0501001502001984: 90th percentile AQI 1261985: 90th percentile AQI 1431986: 90th percentile AQI 1361987: 90th percentile AQI 401988: 90th percentile AQI 931989: 90th percentile AQI 971990: 90th percentile AQI 1081991: 90th percentile AQI 841992: 90th percentile AQI 871993: 90th percentile AQI 1011994: 90th percentile AQI 1011995: 90th percentile AQI 1261996: 90th percentile AQI 1121997: 90th percentile AQI 1261998: 90th percentile AQI 1471999: 90th percentile AQI 1542000: 90th percentile AQI 1192001: 90th percentile AQI 1052002: 90th percentile AQI 1362003: 90th percentile AQI 1082004: 90th percentile AQI 932005: 90th percentile AQI 1082006: 90th percentile AQI 1002007: 90th percentile AQI 1082008: 90th percentile AQI 972009: 90th percentile AQI 612010: 90th percentile AQI 972011: 90th percentile AQI 1002012: 90th percentile AQI 772013: 90th percentile AQI 582014: 90th percentile AQI 612015: 90th percentile AQI 612016: 90th percentile AQI 612017: 90th percentile AQI 632018: 90th percentile AQI 642019: 90th percentile AQI 612020: 90th percentile AQI 562021: 90th percentile AQI 612022: 90th percentile AQI 582023: 90th percentile AQI 672024: 90th percentile AQI 612025: 90th percentile AQI 571984: Median AQI 481985: Median AQI 711986: Median AQI 741987: Median AQI 191988: Median AQI 471989: Median AQI 471990: Median AQI 471991: Median AQI 441992: Median AQI 441993: Median AQI 491994: Median AQI 471995: Median AQI 501996: Median AQI 501997: Median AQI 511998: Median AQI 541999: Median AQI 672000: Median AQI 612001: Median AQI 522002: Median AQI 512003: Median AQI 512004: Median AQI 512005: Median AQI 532006: Median AQI 542007: Median AQI 572008: Median AQI 472009: Median AQI 432010: Median AQI 482011: Median AQI 482012: Median AQI 442013: Median AQI 422014: Median AQI 422015: Median AQI 412016: Median AQI 442017: Median AQI 492018: Median AQI 482019: Median AQI 462020: Median AQI 422021: Median AQI 442022: Median AQI 452023: Median AQI 462024: Median AQI 472025: Median AQI 441984198919941999200420092014201920242025
  • 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
Ozone18350%
Fine particles (PM2.5)18250%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536526110310004457101Ozone
20243662211450000476190Ozone
202336522413380004667137Ozone
202236523812610004558115PM2.5
202136523113220004461107PM2.5
2020366273930000425693PM2.5
201936522314020004661115PM2.5
201836520515910004864108PM2.5
201736519716710004963105PM2.5
20163662738742004461161Ozone
20153642847910004161105Ozone
20143642591050000426197Ozone
20133652828210004258105Ozone
201236625010970004477126Ozone
20113652061263210048100154Ozone
2010365204131300004897147Ozone
20093652808320004361147Ozone
2008366212122311004797154Ozone
20073651541584670057108177Ozone
20063641681603330054100159Ozone
20053641691474440053108166Ozone
2004362177162221005193151Ozone
20033641821403480051108177Ozone
200236517512140281051136201Ozone
20013641731474040052105159Ozone
200036513416654110061119185Ozone
199936511614661375067154217Ozone
199835916611545285054147218Ozone
199734916611748162051126206Ozone
19963621851214880050112161Ozone
199535518110650153050126216Ozone
19943522021142961047101204Ozone
19933371811213140049101187Ozone
1992358229109164004487172Ozone
1991342218110122004484151Ozone
1990309177923550047108177Ozone
1989327181120242004797156Ozone
198821012176111104793202Ozone
1987555410000194053PM10
1986211787540180074136192Ozone
1985170585943100071143195Ozone
1984264145763490048126185Ozone

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 1984–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem