Charleston, WV Air Quality in December
Across 2019–2025, Charleston's December air quality had a median AQI of 38 (Good) over 217 monitored days in the Charleston, WV area. 0.0% of December days (0 of 217) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 82.0% of days. The cleanest December on record here was 2022 (median AQI 32, 0 days above 100) and the worst was 2025 (median 42, 0 days above 100, peak AQI 59).
- Good: 77.0%
- Moderate: 23.0%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for Charleston Homes
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How is the air in Charleston 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.
- ✓77.0% of December days were Good (AQI 0–50), 23.0% Moderate (51–100).
- ✓0 days of 217 reached AQI 101+; the December peak was 65.
- ✓Best December: 2022; worst December: 2025.
Frequently asked questions
What is the air quality like in Charleston in December?▾
Across 2019–2025, the median daily AQI in Charleston in December was 38 (Good). 77.0% of days were Good, 23.0% Moderate, and 0.0% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is December a good time for outdoor exercise in Charleston?▾
A typical December day in Charleston 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 Charleston's December air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 82.0% of December days in Charleston. The highest December AQI recorded in 2019–2025 was 65 (Moderate), in 2025.
Charleston December air quality, year by year
Charleston December air quality by year (Charleston, WV, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 42 | 0 | 58 | PM2.5 |
| 2020 | 31 | 42 | 0 | 63 | PM2.5 |
| 2021 | 31 | 40 | 0 | 65 | PM2.5 |
| 2022cleanest | 31 | 32 | 0 | 53 | PM2.5 |
| 2023 | 31 | 37 | 0 | 56 | PM2.5 |
| 2024 | 31 | 34 | 0 | 59 | PM2.5 |
| 2025worst | 31 | 42 | 0 | 59 | PM2.5 |
What December air means in Charleston
A typical December day in Charleston 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 in line with Charleston's whole-year median of 41, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median December AQI across every EPA metro area (95,590 metro-days, 2019–2025) is 39, so Charleston 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 Charleston's winter season (December, January, February); the winter page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Charleston
The latest EPA AirNow observation puts Charleston's AQI at 55 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Charleston air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Charleston, WV), 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.