SmogRank / World / North America / United States / South Carolina
Most polluted cities in South Carolina, United States
5 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Saint Andrews at 8.0 µg/m³, #981 in the world.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
Cities coloured by their PM2.5 over the last 24 hours. Fires, smoke and ash: Oct 5, the newest UTC day mapped.
- 1Saint Andrewslast full day 4 Oct 0%
- 2Spartanburg 0%
- 3North Charleston 0%
- 4Dentsville 0%
- 5Greenville 0%
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Estimated: cities without a monitor
South Carolina cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Columbia | ≈ 6 µg/m³ |
| Charleston | ≈ 7 µg/m³ |
| Mount Pleasant | ≈ 7 µg/m³ |
| Rock Hill | ≈ 6 µg/m³ |
| Summerville | ≈ 6 µg/m³ |
| Sumter | ≈ 6 µg/m³ |
| Goose Creek | ≈ 8 µg/m³ |
| Hilton Head Island | ≈ 6 µg/m³ |
| Florence | ≈ 5 µg/m³ |
| Hilton Head | ≈ 6 µg/m³ |
| Myrtle Beach | ≈ 4 µg/m³ |
| Aiken | ≈ 7 µg/m³ |
| Greer | ≈ 8 µg/m³ |
| Anderson | ≈ 7 µg/m³ |
| Mauldin | ≈ 8 µg/m³ |
| Greenwood | ≈ 6 µg/m³ |
| North Augusta | ≈ 9 µg/m³ |
| Taylors | ≈ 9 µg/m³ |
| Conway | ≈ 4 µg/m³ |
| Easley | ≈ 8 µg/m³ |
| Simpsonville | ≈ 8 µg/m³ |
| Wade Hampton | ≈ 9 µg/m³ |
| Lexington | ≈ 7 µg/m³ |
| Socastee | ≈ 4 µg/m³ |
| Hanahan | ≈ 8 µg/m³ |
| Bluffton | ≈ 6 µg/m³ |
| West Columbia | ≈ 6 µg/m³ |
| North Myrtle Beach | ≈ 4 µg/m³ |
| Clemson | ≈ 7 µg/m³ |
| Seven Oaks | ≈ 7 µg/m³ |
Bad-air episodes in South Carolina
- Georgia, South Carolina and Florida, United States, April 202621 to 23 April 2026, 3 days12 cities71 µg/m³peak, Valdosta
- Eastern United States, March 202626 March 2026, 1 day13 cities44 µg/m³peak, Chattanooga
- South-eastern United States, March 202619 to 21 March 2026, 3 days21 cities47 µg/m³peak, Macon
- Eastern United States, February 202625 February 2026, 1 day9 cities40 µg/m³peak, Wake Forest
- Alabama, Georgia and South Carolina, United States, February 202614 February 2026, 1 day11 cities66 µg/m³peak, Columbus
- Georgia, Florida and South Carolina, United States, February 20263 February 2026, 1 day9 cities37 µg/m³peak, Daytona Beach
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
Use this board
SmogRank, most polluted cities in South Carolina, United States, PM2.5, last 30 days to 7 Oct 2026, 00:00 UTC, smogrank.com/us/region/south-carolina?w=30d.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Updated 2026-10-07 00:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.