Knoxville Air Quality in 2019
In 2019, Knoxville's air quality (Knoxville, TN area) had a median daily AQI of 52 (Moderate) across 365 monitored days. 4 days (1.1%) reached Unhealthy for Sensitive Groups or worse, 160 were Good, and the year's peak AQI was 115 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 194 of those days. The cleanest month of 2019 was October (median AQI 39, 0 days above 100) and the worst was September (median 61, 2 days above 100, peak 105).
- Good: 43.8%
- Moderate: 55.1%
- Unhealthy for Sensitive Groups: 1.1%
- Unhealthy or worse: 0.0%
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How was Knoxville's air quality in 2019?
Moderate on a typical day: median AQI 52, with 4 days above AQI 100 out of 365 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 115 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 194 days.
- ✓Cleanest month: October; worst: September.
Frequently asked questions
What was the average AQI in Knoxville in 2019?▾
EPA's Air Quality System puts Knoxville's (Knoxville, TN) median daily AQI for 2019 at 52, which is Moderate. 4 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 115.
Which month had the worst air quality in Knoxville in 2019?▾
The cleanest month of 2019 was October (median AQI 39, 0 days above 100) and the worst was September (median 61, 2 days above 100, peak 105).
Was 2019 a good or bad year for Knoxville's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 5th cleanest by days above AQI 100. 2019's median of 52 is in line with the area's typical annual median of 52.
Knoxville month by month in 2019
Knoxville air quality month by month, 2019 (Knoxville, TN, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 50 | 0 | 62 | PM2.5 |
| February | 28 | 43 | 0 | 66 | PM2.5 |
| March | 31 | 51 | 0 | 77 | O3 |
| April | 30 | 53 | 0 | 77 | O3 |
| May | 31 | 60 | 1 | 115 | PM2.5 |
| June | 30 | 52 | 0 | 87 | O3 |
| July | 31 | 54 | 0 | 80 | PM2.5 |
| August | 31 | 53 | 1 | 101 | PM2.5 |
| Septemberworst | 30 | 61 | 2 | 105 | O3 |
| Octobercleanest | 31 | 39 | 0 | 71 | O3 |
| November | 30 | 53 | 0 | 72 | PM2.5 |
| December | 31 | 48 | 0 | 68 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 5th cleanest by days above AQI 100.
2019's median of 52 is in line with the area's typical annual median of 52.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Knoxville
The latest EPA AirNow observation puts Knoxville's AQI at 50 (PM2.5). The figures above are multi-year annual 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.