Charleston, SC Air Quality in June
Across 2019–2025, Charleston's June air quality had a median AQI of 46 (Good) over 210 monitored days in the Charleston-North Charleston, SC area. 1.0% of June days (2 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 74.8% of days. The cleanest June on record here was 2021 (median AQI 42, 0 days above 100) and the worst was 2023 (median 54, 1 day above 100, peak AQI 105).
- Good: 57.6%
- Moderate: 41.4%
- Unhealthy for Sensitive Groups: 1.0%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Charleston
Today's main pollutant in Charleston is ground-level ozone (AQI 31). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Charleston in June?
Good on a typical day: median AQI 46 across 2019–2025, with 1.0% of June days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓57.6% of June days were Good (AQI 0–50), 41.4% Moderate (51–100).
- ✓2 days of 210 reached AQI 101+; the June peak was 117.
- ✓Best June: 2021; worst June: 2023.
Frequently asked questions
What is the air quality like in Charleston in June?▾
Across 2019–2025, the median daily AQI in Charleston in June was 46 (Good). 57.6% of days were Good, 41.4% Moderate, and 1.0% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is June a good time for outdoor exercise in Charleston?▾
A typical June day in Charleston sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of June days (1.0%) reached AQI 101+ in 2019–2025.
Which pollutant causes Charleston's June air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 74.8% of June days in Charleston. The highest June AQI recorded in 2019–2025 was 117 (Unhealthy for Sensitive Groups), in 2023.
Charleston June air quality, year by year
Charleston June air quality by year (Charleston-North Charleston, SC, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 43 | 0 | 75 | PM2.5 |
| 2020 | 30 | 38 | 1 | 117 | PM2.5 |
| 2021cleanest | 30 | 42 | 0 | 64 | PM2.5 |
| 2022 | 30 | 52 | 0 | 80 | PM2.5 |
| 2023worst | 30 | 54 | 1 | 105 | PM2.5 |
| 2024 | 30 | 50 | 0 | 71 | O3 |
| 2025 | 30 | 46 | 0 | 84 | PM2.5 |
What June air means in Charleston
A typical June day in Charleston sits in the Good range (median AQI 46), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 100 of June days (1.0%) reached AQI 101+ in 2019–2025.
June's median AQI of 46 is in line with Charleston's whole-year median of 47, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median June AQI across every EPA metro area (100,635 metro-days, 2019–2025) is 46, so Charleston runs in line with the national June norm; 1.0% of its June days topped AQI 100 versus 3.7% nationally (below average).
June is part of Charleston's summer season (June, July, August); the summer 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 31 (O3). 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-North Charleston, SC), 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.