Lexington Air Quality in December
Across 2019–2025, Lexington's December air quality had a median AQI of 38 (Good) over 216 monitored days in the Lexington-Fayette, KY area. 0.0% of December days (0 of 216) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 88.9% of days. The cleanest December on record here was 2021 (median AQI 29, 0 days above 100) and the worst was 2020 (median 54, 0 days above 100, peak AQI 69).
- Good: 72.2%
- Moderate: 27.8%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for Lexington Homes
Air quality in Lexington is moderate (AQI 53), 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.
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How is the air in Lexington in December?
Good on a typical day: median AQI 38 across 2019–2025, with 0.0% of December days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓72.2% of December days were Good (AQI 0–50), 27.8% Moderate (51–100).
- ✓0 days of 216 reached AQI 101+; the December peak was 69.
- ✓Best December: 2021; worst December: 2020.
Frequently asked questions
What is the air quality like in Lexington in December?▾
Across 2019–2025, the median daily AQI in Lexington in December was 38 (Good). 72.2% of days were Good, 27.8% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 216 monitored days in EPA's Air Quality System.
Is December a good time for outdoor exercise in Lexington?▾
A typical December day in Lexington sits in the Good range (median AQI 38), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of December days reached AQI 101+ in 2019–2025.
Which pollutant causes Lexington's December air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 88.9% of December days in Lexington. The highest December AQI recorded in 2019–2025 was 69 (Moderate), in 2020.
Lexington December air quality, year by year
Lexington December air quality by year (Lexington-Fayette, KY, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 44 | 0 | 66 | PM2.5 |
| 2020worst | 31 | 54 | 0 | 69 | PM2.5 |
| 2021cleanest | 30 | 29 | 0 | 57 | NO2 |
| 2022 | 31 | 37 | 0 | 59 | PM2.5 |
| 2023 | 31 | 33 | 0 | 55 | PM2.5 |
| 2024 | 31 | 34 | 0 | 54 | PM2.5 |
| 2025 | 31 | 42 | 0 | 69 | PM2.5 |
What December air means in Lexington
A typical December day in Lexington sits in the Good range (median AQI 38), so running, cycling and children's outdoor play are fine for everyone on most days; fewer than 1% of December days reached AQI 101+ in 2019–2025.
December's median AQI of 38 is below Lexington's whole-year median of 44, making it one of the area's cleaner periods. Nationally, the median December AQI across every EPA metro area (95,590 metro-days, 2019–2025) is 39, so Lexington runs in line with the national December norm; 0.0% of its December days topped AQI 100 versus 0.7% nationally (about the same).
December is part of Lexington's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Lexington
The latest EPA AirNow observation puts Lexington's AQI at 53 (PM2.5). The figures above are multi-year month 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.