Median AQI
46
Good
Tennessee · County air quality · 2025
Blount County, Tennessee
Median AQI 46 (Good). 69.6% of monitored days rated Good, direct from EPA Air Quality System stations.
- 46
- Median AQI
- 69.6%
- Good-air days
- 0
- Unhealthy days
- 31%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Blount County's air is good on balance, more polluted than the median US county, a median AQI of 46 with 69.6% of 224 monitored days in the Good band, driven mainly by Ozone.
- 46
- median AQI · Good
- 69.6%
- days rated Good
- Ozone
- main pollutant
- 31%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 101.
Data updated July 2026
- Good · 156 d · 69.6%
- Moderate · 67 d · 29.9%
- USG · 1 d · 0.4%
How did Blount County's air break down in 2025?
Across 224 monitored days, 156 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 101 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 224 days monitored. Median AQI: 46 (Good).
Insights: Blount County, Tennessee. EPA monitors recorded a median Air Quality Index of 46 across 224 measured days in 2025, earning a Good classification and a Moderate health grade. Of those days, 156 (70%) fell in the Good band (AQI 0–50), 67 (30%) registered Moderate readings, and 1 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 58, while the worst single-day peak hit 101 (USG). Residents averaged about 20.9 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (115 days), PM2.5 (109 days). Across the 2020–2025 trend window, good days shifted by -117 and the median AQI moved +4 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 101, usg but never Unhealthy. Nearby counties show comparable readings: Anderson (91.0% good, AQI 42); Claiborne (96.3% good, AQI 36); Davidson (51.8% good, AQI 50); DeKalb (95.4% good, AQI 35); Dyer (79.4% good, AQI 34); Hamilton (64.1% good, AQI 45).
Air Quality Summary
Good Days
69.6%
156 of 224 monitored days
-5.4pp vs 75% target
Max AQI Recorded
101
USG
Health Grade
Moderate
90th-pct AQI 58
Blount County, Good days share 69.6%
National avg
Share of monitored days at AQI 0-50 (Good band).
Blount 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 224 monitored days across EPA AQI categories.
Good
156
70%
Moderate
67
30%
USG
1
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 Blount County.
- Ozone · 115 days · 51.3%
- PM2.5 · 109 days · 48.7%
Health Impact Assessment
Moderate
Blount County's air quality is rated Moderate based on 69.6% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 69.6% of monitored days in 2025, with a median AQI of 46. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 115 of 224 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Blount County. Best year: 2020 (273 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 273 | 93 | 0 | 0 | 42 | 93 |
| 2021 | 231 | 132 | 2 | 0 | 44 | 107 |
| 2022 | 238 | 126 | 1 | 0 | 45 | 115 |
| 2023 | 224 | 133 | 8 | 0 | 46 | 137 |
| 2024 | 221 | 145 | 0 | 0 | 47 | 90 |
| 2025 | 156 | 67 | 1 | 0 | 46 | 101 |
How does Blount County compare?
How Blount County compares
Good-day share worse than US avg
Blount County 69.6%
Anderson County, Tennessee 91.0%
US average 76.5%
Median AQI worse than US avg
Blount County 46
Anderson County, Tennessee 42
US average 38
Unhealthy days / yr about average
Blount 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 Blount County.
Bay County, Florida
AQI 46 · 60.6% good
Cache County, Utah
AQI 46 · 61.2% good
Chesterfield County, South Carolina
AQI 46 · 61.2% good
Clark County, Indiana
AQI 46 · 59.7% good
Clark County, Ohio
AQI 46 · 59.4% good
Cochise County, Arizona
AQI 46 · 65.6% good
What Blount 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 46 means for exposure. Health guidance
- See how Blount County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Blount County with its Tennessee neighbours before drawing a conclusion about the region. All of Tennessee
Based on 224 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 Blount County, Tennessee? ▼
Blount County has a median Air Quality Index (AQI) of 46, rated "Good." 69.6% of monitored days (156 out of 224) had good air quality in 2025.
What is the main pollutant in Blount County? ▼
The primary pollutant in Blount County is Ozone (O3), which was the main AQI driver on 115 days (51% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Blount County have? ▼
In 2025, Blount County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 101.
Is the air quality in Blount County getting better or worse? ▼
Air quality in Blount County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 273 good days. Worst year: 2025 with 156 good days.
What does AQI 46 mean for health? ▼
Blount County's median AQI of 46 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 Blount County compare to other counties in Tennessee? ▼
Blount County has 69.6% good air days. Nearby counties in Tennessee: Anderson (91.0% good), Claiborne (96.3% good), Davidson (51.8% good), DeKalb (95.4% good), Dyer (79.4% good), Hamilton (64.1% good).
What is the 90th percentile AQI in Blount County? ▼
The 90th percentile AQI for Blount County is 58, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 101 (USG).
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.