Bad Air Days in Aiken County, South Carolina: 0 a Year

0 bad air days a year

Rare: among the cleanest-air counties EPA monitors. Ranked 981 of 996 monitored counties, where 1 is worst.

What actually helps here

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

Better or worse than it was

In 2000 to 2009 this county averaged 21 bad days a year; in 2016 to 2025, 0. The air has improved.

Date	AQI	Main pollutant
2019-09-25	97	Ozone
2018-05-11	93	Ozone
2018-05-12	87	Ozone
2018-05-13	87	Ozone
2018-06-06	87	Ozone

An ordinary day in Aiken

Across 2,354 monitored days from 2016 to 2025, the air in Aiken County rated Good on 92% of them, more often than the 72% typical of monitored counties, and Moderate on 8%. The median day sat at AQI 38; one day in ten went above 50.

The pollutant setting the AQI on an ordinary day here:

ozone100%2,354 days

Year by year

Year	Days monitored	Good	Moderate	Over 100	Median AQI	Highest AQI
2025*	266	241	25	0	39	71
2024	267	238	29	0	39	84
2023	275	252	23	0	39	80
2022	271	246	25	0	37	87
2021	282	259	23	0	36	84
2020	259	258	1	0	32	71
2019	113	103	10	0	37	97
2018	110	92	18	0	42	93
2017	269	259	10	0	38	71
2016	242	217	25	0	40	84
2015	247	236	11	0	38	64
2014	213	188	25	0	40	87
2013	219	209	10	0	37	80
2012	226	215	11	0	36	93
2011	259	195	63	1	42	108
2010	296	241	55	0	39	97

*2025 may be a partial year in EPA's file.

South Carolina compared

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day.