Charleston, WV Air Quality in 2025
In 2025, Charleston's air quality (Charleston, WV area) had a median daily AQI of 39 (Good) across 365 monitored days. 0 days (0.0%) reached Unhealthy for Sensitive Groups or worse, 281 were Good, and the year's peak AQI was 69 (Moderate). Fine particulate matter (PM2.5) set the daily AQI on 243 of those days. The cleanest month of 2025 was October (median AQI 30, 0 days above 100) and the worst was September (median 49, 0 days above 100, peak 56).
- Good: 77.0%
- Moderate: 23.0%
- Unhealthy for Sensitive Groups: 0.0%
- Unhealthy or worse: 0.0%
Extra Protection for Charleston Homes
Air quality in Charleston is moderate (AQI 55), 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 was Charleston's air quality in 2025?
Good on a typical day: median AQI 39, with 0 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2025: 69 (Moderate).
- ✓Fine particulate matter (PM2.5) was the main pollutant on 243 days.
- ✓Cleanest month: October; worst: September.
Frequently asked questions
What was the average AQI in Charleston in 2025?▾
EPA's Air Quality System puts Charleston's (Charleston, WV) median daily AQI for 2025 at 39, which is Good. 0 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 69.
Which month had the worst air quality in Charleston in 2025?▾
The cleanest month of 2025 was October (median AQI 30, 0 days above 100) and the worst was September (median 49, 0 days above 100, peak 56).
Was 2025 a good or bad year for Charleston's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2025's median of 39 is in line with the area's typical annual median of 41.
Charleston month by month in 2025
Charleston air quality month by month, 2025 (Charleston, WV, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 43 | 0 | 63 | PM2.5 |
| February | 28 | 38 | 0 | 55 | PM2.5 |
| March | 31 | 42 | 0 | 63 | PM2.5 |
| April | 30 | 42 | 0 | 62 | O3 |
| May | 31 | 34 | 0 | 52 | O3 |
| June | 30 | 45 | 0 | 69 | PM2.5 |
| July | 31 | 46 | 0 | 60 | PM2.5 |
| August | 31 | 43 | 0 | 64 | PM2.5 |
| Septemberworst | 30 | 49 | 0 | 56 | PM2.5 |
| Octobercleanest | 31 | 30 | 0 | 55 | PM2.5 |
| November | 30 | 35 | 0 | 51 | PM2.5 |
| December | 31 | 42 | 0 | 59 | PM2.5 |
How 2025 compares
Among the 7 years EPA has published for the area (2019–2025), 2025 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2025's median of 39 is in line with the area's typical annual median of 41.
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 annual 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.