Median AQI
41
Good
Tennessee · County air quality · 2025
Sevier County, Tennessee
Median AQI 41 (Good). 94.6% of monitored days rated Good, direct from EPA Air Quality System stations.
- 41
- Median AQI
- 94.6%
- Good-air days
- 0
- Unhealthy days
- 88%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Sevier County's air is good on balance, cleaner than most US counties, a median AQI of 41 with 94.6% of 223 monitored days in the Good band, driven mainly by Ozone.
- 41
- median AQI · Good
- 94.6%
- days rated Good
- Ozone
- main pollutant
- 88%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 84.
Data updated July 2026
- Good · 211 d · 94.6%
- Moderate · 12 d · 5.4%
How did Sevier County's air break down in 2025?
Across 223 monitored days, 211 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 84 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 223 days monitored. Median AQI: 41 (Good).
Insights: Sevier County, Tennessee. EPA monitors recorded a median Air Quality Index of 41 across 223 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 211 (95%) fell in the Good band (AQI 0–50), 12 (5%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 48, while the worst single-day peak hit 84 (Moderate). Residents averaged about 28.4 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (223 days). Across the 2020–2025 trend window, good days shifted by -125 and the median AQI moved +1 points, placing the multi-year trajectory at stable. The worst single reading over the 2020–2025 window was AQI 84, moderate but never Unhealthy. Nearby counties show comparable readings: Anderson (91.0% good, AQI 42); Blount (69.6% good, AQI 46); Claiborne (96.3% good, AQI 36); Davidson (51.8% good, AQI 50); DeKalb (95.4% good, AQI 35); Dyer (79.4% good, AQI 34).
Air Quality Summary
Good Days
94.6%
211 of 223 monitored days
19.6pp vs 75% target
Max AQI Recorded
84
Moderate
Health Grade
Excellent
90th-pct AQI 48
Sevier County, Good days share 94.6%
National avg
Share of monitored days at AQI 0-50 (Good band).
Sevier County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 223 monitored days across EPA AQI categories.
Good
211
95%
Moderate
12
5%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Sevier County.
- Ozone · 223 days · 100.0%
Health Impact Assessment
Excellent
Sevier County's air quality is rated Excellent based on 94.6% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 94.6% of monitored days in 2025, with a median AQI of 41. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 223 of 223 monitored days.
5-Year Air Quality Trend
Air quality is stable in Sevier County. Best year: 2020 (336 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 336 | 26 | 1 | 0 | 40 | 105 |
| 2021 | 310 | 53 | 0 | 0 | 42 | 93 |
| 2022 | 262 | 48 | 0 | 0 | 44 | 93 |
| 2023 | 205 | 60 | 3 | 0 | 45 | 115 |
| 2024 | 289 | 73 | 0 | 0 | 44 | 93 |
| 2025 | 211 | 12 | 0 | 0 | 41 | 84 |
How does Sevier County compare?
How Sevier County compares
Good-day share better than US avg
Sevier County 94.6%
Anderson County, Tennessee 91.0%
US average 76.5%
Median AQI worse than US avg
Sevier County 41
Anderson County, Tennessee 42
US average 38
Unhealthy days / yr about average
Sevier County 0
Anderson County, Tennessee 0
US average 0
Other Counties in Tennessee
Air quality comparison for nearby counties in Tennessee.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Sevier County.
Albemarle County, Virginia
AQI 41 · 77.9% good
Anderson County, South Carolina
AQI 41 · 90.0% good
Berkshire County, Massachusetts
AQI 41 · 71.6% good
Berrien County, Michigan
AQI 41 · 80.9% good
Blair County, Pennsylvania
AQI 41 · 71.9% good
Bonner County, Idaho
AQI 41 · 71.3% good
What Sevier County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 41 means for exposure. Health guidance
- See how Sevier County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Sevier County with its Tennessee neighbours before drawing a conclusion about the region. All of Tennessee
Based on 223 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Sevier County, Tennessee? ▼
Sevier County has a median Air Quality Index (AQI) of 41, rated "Good." 94.6% of monitored days (211 out of 223) had good air quality in 2025.
What is the main pollutant in Sevier County? ▼
The primary pollutant in Sevier County is Ozone (O3), which was the main AQI driver on 223 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Sevier County have? ▼
In 2025, Sevier County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 84.
Is the air quality in Sevier County getting better or worse? ▼
Air quality in Sevier County is stable based on 5-year trends (2020-2025). Best year: 2020 with 336 good days. Worst year: 2023 with 205 good days.
What does AQI 41 mean for health? ▼
Sevier County's median AQI of 41 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Sevier County compare to other counties in Tennessee? ▼
Sevier County has 94.6% good air days. Nearby counties in Tennessee: Anderson (91.0% good), Blount (69.6% good), Claiborne (96.3% good), Davidson (51.8% good), DeKalb (95.4% good), Dyer (79.4% good).
What is the 90th percentile AQI in Sevier County? ▼
The 90th percentile AQI for Sevier County is 48, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 84 (Moderate).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.