Charleston Air Quality in 2024: Pollution Patterns
How air quality behaves in Charleston: the latest measured AQI, which pollutants dominate, seasonal patterns, and the local drivers of pollution.
Current Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Charleston Air Quality in 2024
This page covers what shapes air quality in Charleston over the course of a year: the pollutants that dominate locally, how conditions typically shift between seasons, and the local emission sources behind them. Measured 2024 annual statistics are published by EPA's Air Quality System, not here, so the AQI figure below is the latest observation available when this page was published.
View Current Charleston Air Quality →Latest Measured Reading for Charleston
The most recent EPA AirNow observation for the Charleston reporting area puts Charleston's AQI at 19 (Good), with ground-level ozone (O3) as the dominant pollutant — typical for the Southeast region. Observed 6:00 AM EDT on August 9, 2026. Reported by South Carolina DES.
This is a single observation captured when the page was published, not a 2024 average. For measured annual and monthly statistics, use the EPA's Air Quality System reports.
How Charleston Air Quality Shifts Through the Year
Mar–May: Usually Charleston's cleanest stretch. Mild temperatures and better atmospheric mixing keep both ozone and particulates down.
Jun–Aug: Heat and sunlight drive ozone formation to its yearly peak. Afternoons are typically the worst time to be outside.
Sep–Nov: Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the Southeast region.
Dec–Feb: Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Seasonal patterns above describe how pollution typically behaves in this region. They are not measured 2024 averages for Charleston.
Is It Safe to Exercise Outside in Charleston?
With Charleston's AQI at 19 (Good), outdoor exercise is generally safe for most people. Conditions are good for running, cycling, and outdoor sports at any time of day.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Charleston's Air Pollution?
In Charleston, the leading pollutant is ground-level ozone (O3). As part of the Southeast region, the main drivers of air pollution here are:
- •Vehicle emissions worsened by urban sprawl and car dependency
- •Power-plant emissions from the regional energy grid
- •High humidity that traps pollutants near ground level
- •Seasonal wildfire and prescribed-burn smoke
Dig deeper: Charleston PM2.5 levels · Charleston ozone levels
Air Purifier & Monitor Buying Guides
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PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Charleston Air Quality
What is the current air quality in Charleston?
The current Air Quality Index (AQI) in Charleston, SC is 19, which is considered good.
Is it safe to exercise outdoors in Charleston?
Yes, with an AQI of 19, outdoor exercise is safe for everyone in Charleston.
When is the best time of year to visit Charleston for good air quality?
Spring and early fall typically offer the best air quality in Charleston. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Charleston?
Air pollution in Charleston can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Reduce Indoor Ozone in Charleston
Today's main pollutant in Charleston is ground-level ozone (AQI 19). 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.
Compare activated-carbon purifiers (for gases & ozone):
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