Air quality in Charleston County, South Carolina, United States of America today
Mr. Duck’s Air Quality Score
Moderate air today for Charleston County, South Carolina, United States of America
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Charleston County, South Carolina is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 12.3 µg/m³ based on two valid observations reported through OpenAQ.
These measurements indicate that the fine particle level is the dominant factor influencing today’s air quality assessment. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.
Latest sensor values
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
What the data includes
The Charleston County air‑quality dataset contains four pollutant measurements drawn from a single monitoring site at Cape Romain. The available compounds are nitrogen dioxide (NO2), ozone (O3), fine particulate matter (PM2.5) and sulfur dioxide (SO2). Because only one station contributes data, the spatial coverage is limited to that location; there are no additional rows or stations providing alternative readings for the county.
The most recent observations are fairly current for three of the four pollutants. Ozone and PM2.5 were both recorded on 2026‑02‑10 at 23:00 UTC, while NO2 was last logged on 2024‑01‑03 at 17:00 UTC. Sulfur dioxide is the outlier, with its latest value dating back to 2022‑02‑01 at 20:00 UTC, indicating that this metric has not been updated for several years. All three of the newer pollutants show a single recorded value rather than a range: NO2 consistently measures 0.003 ppm, O3 holds steady at 0.048 ppm, and PM2.5 remains at 12.3 µg/m³ across the available data points.
Because each pollutant has only one reported figure, there is no observable spread or variability within the dataset; the minimum, median, and maximum values are identical for every compound. The freshness distribution also highlights an uneven reporting pattern: two of the four rows fall into the “updated within 7 days” category, while the remaining two are classified as old data. Consequently, while recent ozone and particulate readings give a snapshot of current conditions at Cape Romain, the lack of multiple stations and older sulfur‑dioxide data mean that city‑wide air‑quality conditions may differ elsewhere or change over time.
Learn more about sources and filtering: About the data.
Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)
Latest sensor values (bars)
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
Data notes
The data shown reflects two valid measurements and was updated within 3 days, with the latest reading recorded on 2026‑02‑10 at 23:00 UTC. This snapshot provides a brief view of current conditions, but air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in Charleston County.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Cape Romain | no2 | 0.003 | ppm | 2024-01-03 17:00 UTC |
| Cape Romain | o3 | 0.048 | ppm | 2026-02-10 23:00 UTC |
| Cape Romain | pm25 | 12.3 | µg/m³ | 2026-02-10 23:00 UTC |
| Cape Romain | so2 | 0.0 | ppm | 2022-02-01 20:00 UTC |