Knoxville Air Quality in March
Across 2019–2025, Knoxville's March air quality had a median AQI of 49 (Good) over 217 monitored days in the Knoxville, TN area. 1.0% of March days (2 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 60.4% of days. The cleanest March on record here was 2020 (median AQI 42, 0 days above 100) and the worst was 2025 (median 51, 1 day above 100, peak AQI 156).
- Good: 53.0%
- Moderate: 46.1%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.5%
Extra Protection for Knoxville Homes
Air quality in Knoxville is moderate (AQI 61), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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How is the air in Knoxville in March?
Good on a typical day: median AQI 49 across 2019–2025, with 1.0% of March days above AQI 100. Ground-level ozone is the main driver.
- ✓53.0% of March days were Good (AQI 0–50), 46.1% Moderate (51–100).
- ✓2 days of 217 reached AQI 101+; the March peak was 156.
- ✓Best March: 2020; worst March: 2025.
Frequently asked questions
What is the air quality like in Knoxville in March?▾
Across 2019–2025, the median daily AQI in Knoxville in March was 49 (Good). 53.0% of days were Good, 46.1% Moderate, and 1.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is March a good time for outdoor exercise in Knoxville?▾
A typical March day in Knoxville sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of March days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Knoxville's March air quality problems?▾
Ground-level ozone set the daily AQI on 60.4% of March days in Knoxville. The highest March AQI recorded in 2019–2025 was 156 (Unhealthy), in 2025.
Knoxville March air quality, year by year
Knoxville March air quality by year (Knoxville, TN, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 51 | 0 | 77 | O3 |
| 2020cleanest | 31 | 42 | 0 | 62 | O3 |
| 2021 | 31 | 47 | 1 | 103 | PM2.5 |
| 2022 | 31 | 48 | 0 | 97 | O3 |
| 2023 | 31 | 52 | 0 | 77 | O3 |
| 2024 | 31 | 52 | 0 | 88 | O3 |
| 2025worst | 31 | 51 | 1 | 156 | O3 |
What March air means in Knoxville
A typical March day in Knoxville sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of March days (1.0%) reached AQI 101+ in 2019–2025.
March's median AQI of 49 is in line with Knoxville's whole-year median of 52, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median March AQI across every EPA metro area (102,455 metro-days, 2019–2025) is 42, so Knoxville runs above the national March norm; 1.0% of its March days topped AQI 100 versus 0.4% nationally (about the same).
March is part of Knoxville's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Knoxville
The latest EPA AirNow observation puts Knoxville's AQI at 61 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Knoxville air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Knoxville, TN), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.