Metro area air quality · 2025

Sevierville, TN

Median AQI 40 (Good). 96.7% of monitored days rated Good across this metro's EPA monitoring network.

40
Median AQI
96.7%
Good-air days
0
Unhealthy days
97%
Cleaner than US metros

Sevierville, TN posted a 2025 median AQI of 40 (Good) with 96.7% Good days

According to the U.S. EPA Air Quality System, the Sevierville, TN CBSA recorded a median AQI of 40 across 363 monitored days in 2025, with 96.7% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.

Data source EPA Air Quality System (AQS)

Cleaner than US metros
The Sevierville, TN CBSA's 96.7% Good-day share places it cleaner than 97% of US metros in 2025.
Closest median-AQI peer
Altoona, PA (76.9% Good, median AQI 40) is the closest nationwide median-AQI peer to Sevierville, TN.
2020–2025 Good-day shift
Sevierville, TN's Good-day share moved +3.9 points from 2020 to 2025 (median AQI +0).
Median AQI
Median AQI: 40

Aggregated from EPA Air Quality System (2025), 363 monitored days. EPA AQS →

The verdict

The Sevierville, TN metro runs good on the EPA scale, among the cleanest 10% of US metros, a median AQI of 40 with 96.7% of 363 monitored days in the Good band.

40
median AQI · Good
96.7%
days rated Good
97%
cleaner than US metros
84
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Sevierville, TN metro's Good-day share rose from 79.8% to 96.7% between the 2024 and 2025 EPA annual releases, a change of +16.9 percentage points.
  • Sevierville, TN metro's median AQI fell from 44 to 40 between the 2024 and 2025 EPA annual releases, a change of -4 points.

Compared against 362 monitored days in 2024 and 363 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Insights: Sevierville, TN metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 40 over 363 measured days in 2025, which corresponds to a Good band and a Excellent metro-wide health grade. The monitored-day split lands at 351 Good days (97%), 12 Moderate (3%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 47 while the highest single-day reading hit 84 (Moderate). Metro residents averaged roughly 29.0 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +3.9 points and the median AQI moved +0 points, which classifies the multi-year trajectory as improving. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Altoona, PA (76.9% good, AQI 40); Beaver Dam, WI (72.3% good, AQI 40); Bismarck, ND (76.7% good, AQI 40).

Air Quality Summary

Median AQI

40

Good

Good Days

96.7%

351 of 363 days

Max AQI

84

Moderate

Health Grade

Excellent

90th pct: 47

AQI Day Breakdown (2025)

Distribution of 363 monitored days across EPA AQI categories.

Good

351

97%

Moderate

12

3%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Excellent

The Sevierville, TN metro area's air quality is rated Excellent based on 96.7% good air days. No unhealthy air days were recorded in 2025.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

How does the Sevierville, TN metro compare?

How Sevierville, TN compares

Good-day share better than US avg
Sevierville, TN 96.7%
Altoona, PA 76.9%
US average 70.6%
Median AQI better than US avg
Sevierville, TN 40
Altoona, PA 40
US average 41
Unhealthy days / yr better than US avg
Sevierville, TN 0
Altoona, PA 0
US average 1

5-Year Air Quality Trend

Air quality is improving in the Sevierville, TN metro. Best year: 2025 (351 good days).

Year Good Moderate Unhealthy Median AQI
2020 336 26 0 40
2021 310 53 0 42
2022 262 48 0 44
2023 205 60 0 45
2024 289 73 0 44
2025 351 12 0 40

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Sevierville, TN (40).

Altoona, PA

Median AQI 40 · 76.9% Good-day share

40

Beaver Dam, WI

Median AQI 40 · 72.3% Good-day share

40

Bismarck, ND

Median AQI 40 · 76.7% Good-day share

40

Cape Coral-Fort Myers, FL

Median AQI 40 · 76.4% Good-day share

40

College Station-Bryan, TX

Median AQI 40 · 68.5% Good-day share

40

Fallon, NV

Median AQI 40 · 85.2% Good-day share

40

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Sevierville, TN's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

22

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

41

Akron, OH

0 unhealthy-or-worse days · median AQI 45

45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Sevierville, TN metro area? ▼
The Sevierville, TN metro area has a median Air Quality Index (AQI) of 40, rated "Good." 96.7% of monitored days (351 out of 363) had good air quality in 2025.
How many unhealthy air days does Sevierville, TN have? ▼
In 2025, the Sevierville, TN metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 84.
Is air quality in Sevierville, TN getting better or worse? ▼
Air quality in the Sevierville, TN metro is improving based on 5-year trends (2020-2025). Best year: 2025 with 351 good days. Worst year: 2023 with 205 good days.
What does AQI 40 mean for health? ▼
An AQI of 40 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Sevierville, TN? ▼
The 90th percentile AQI for the Sevierville, TN metro area is 47, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 84 (Moderate).
How does Sevierville, TN compare to other metro areas? ▼
The Sevierville, TN metro has 96.7% good air days. Similar metros: Altoona, PA (76.9% good), Beaver Dam, WI (72.3% good), Bismarck, ND (76.7% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. See our methodology for how AQI, median, and coverage figures are computed.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary files (metro-level) · 2020–2025

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Every figure on PlainAirData 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.