Air Quality Rankings for South Carolina 2026

South Carolina has 18 cities with EPA air quality data. Georgetown, South Carolina has the cleanest air with a 5-year average AQI of 14. Greenville, South Carolina has the highest AQI at 49.

#	City	5yr Avg AQI	Current AQI	Worst Pollutant	Trend	Grade
1	Georgetown, South Carolina	14	14	PM10	Improving	A
2	Colleton, South Carolina	26	26	PM2.5	Improving	A
3	Berkeley, South Carolina	34	36	Ozone	Stable	B
4	Aiken, South Carolina	36	39	Ozone	Improving	B
5	Darlington, South Carolina	36	40	Ozone	Improving	B
6	Oconee, South Carolina	37	37	Ozone	Improving	B
7	Horry, South Carolina	37	43	Ozone	Worsening	C
8	Anderson, South Carolina	39	42	Ozone	Stable	B
9	Chesterfield, South Carolina	39	42	PM2.5	Improving	B
10	Edgefield, South Carolina	41	44	PM2.5	Stable	C
11	Lexington, South Carolina	42	41	PM2.5	Improving	B
12	Florence, South Carolina	42	49	PM2.5	Improving	B
13	Richland, South Carolina	43	47	PM2.5	Improving	B
14	Pickens, South Carolina	44	44	Ozone	Worsening	C
15	York, South Carolina	44	47	Ozone	Worsening	C
16	Charleston, South Carolina	45	47	PM2.5	Stable	C
17	Spartanburg, South Carolina	47	51	PM2.5	Improving	C
18	Greenville, South Carolina	49	52	PM2.5	Stable	C

Air quality data for South Carolina is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
— EPA Air Quality System

Frequently Asked Questions

Georgetown, South Carolina has the best air quality in South Carolina with a 5-year average AQI of 14 and a grade of A.

South Carolina has 18 cities with EPA air quality monitoring data in our database, covering multiple years of AQI measurements.

The Air Quality Index (AQI) measures five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Lower AQI values indicate cleaner air — 0-50 is "Good," while 150+ is "Unhealthy."

Sources: EPA Air Quality System (AQS)

Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.

Cleanest Cities Nationwide →All Air Quality in South Carolina →