Lexington Air Quality in 2021
In 2021, Lexington's air quality (Lexington-Fayette, KY area) had a median daily AQI of 47 (Good) across 363 monitored days. 2 days (0.6%) reached Unhealthy for Sensitive Groups or worse, 214 were Good, and the year's peak AQI was 108 (Unhealthy for Sensitive Groups). Fine particulate matter (PM2.5) set the daily AQI on 267 of those days. The cleanest month of 2021 was December (median AQI 29, 0 days above 100) and the worst was November (median 44, 1 day above 100, peak 108).
- Good: 59.0%
- Moderate: 40.5%
- Unhealthy for Sensitive Groups: 0.6%
- Unhealthy or worse: 0.0%
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How was Lexington's air quality in 2021?
Good on a typical day: median AQI 47, with 2 days above AQI 100 out of 363 monitored — the 6th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2021: 108 (Unhealthy for Sensitive Groups).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 267 days.
- ✓Cleanest month: December; worst: November.
Frequently asked questions
What was the average AQI in Lexington in 2021?▾
EPA's Air Quality System puts Lexington's (Lexington-Fayette, KY) median daily AQI for 2021 at 47, which is Good. 2 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 108.
Which month had the worst air quality in Lexington in 2021?▾
The cleanest month of 2021 was December (median AQI 29, 0 days above 100) and the worst was November (median 44, 1 day above 100, peak 108).
Was 2021 a good or bad year for Lexington's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 6th cleanest by days above AQI 100. 2021's median of 47 is above the area's typical annual median of 44.
Lexington month by month in 2021
Lexington air quality month by month, 2021 (Lexington-Fayette, KY, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 49 | 0 | 74 | PM2.5 |
| February | 28 | 55 | 0 | 77 | PM2.5 |
| March | 31 | 44 | 0 | 77 | PM2.5 |
| April | 30 | 52 | 0 | 70 | PM2.5 |
| May | 31 | 45 | 0 | 77 | O3 |
| June | 30 | 45 | 0 | 100 | PM2.5 |
| July | 31 | 60 | 1 | 101 | PM2.5 |
| August | 31 | 52 | 0 | 87 | PM2.5 |
| September | 30 | 45 | 0 | 74 | PM2.5 |
| October | 31 | 46 | 0 | 61 | PM2.5 |
| Novemberworst | 29 | 44 | 1 | 108 | PM2.5 |
| Decembercleanest | 30 | 29 | 0 | 57 | NO2 |
How 2021 compares
Among the 7 years EPA has published for the area (2019–2025), 2021 ranks 6th cleanest by days above AQI 100.
2021's median of 47 is above the area's typical annual median of 44.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Lexington
The latest EPA AirNow observation puts Lexington's AQI at 38 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Lexington air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Lexington-Fayette, KY), 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.