Clayton County, Georgia air quality history

Daily Air Quality Index summaries from EPA monitors in Clayton, Georgia, 1999–2025.

54%

Good days in 2025

Median daily AQI, 2025

Days above 100 in 2025

122

Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Clayton, Georgia on 122 days. 66 of those days (54%) were in the Good range, and the median daily AQI was 48. That median is about the same as the typical monitored county in Georgia (median 46 across 25 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 122 days. Across the years with fuller monitoring, the share of Good days rose: an average of 47% in 2014–2016 versus 53% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (122 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

Years with fewer than 120 monitored days (2010, 2011, 2012, 2013, 2017, 2019…) are shown in the table but left out of comparisons and trend statements.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Good
Moderate
Unhealthy for Sensitive Groups
Unhealthy
Very Unhealthy
Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median daily AQI
90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

Pollutant	Days as main pollutant	Share of monitored days
Fine particles (PM2.5)	122	100%

Year-by-year data

Annual AQI summary by year
Year	Days with AQI	Good	Moderate	Unhealthy for Sensitive Groups	Unhealthy	Median AQI	90th pct.	Max AQI	Main pollutant
2025	122	66	56	0	0	48	60	74	PM2.5
2024	222	124	96	2	0	45	63	128	PM2.5
2023	121	60	61	0	0	51	63	98	PM2.5
2022	121	82	39	0	0	42	58	72	PM2.5
2021	121	69	52	0	0	44	62	74	PM2.5
2020	121	86	35	0	0	38	59	91	PM2.5
2019	119	66	53	0	0	48	59	73	PM2.5
2018	120	72	48	0	0	44	59	71	PM2.5
2017	116	57	59	0	0	51	63	71	PM2.5
2016	121	67	53	1	0	46	59	145	PM2.5
2015	121	59	62	0	0	51	61	94	PM2.5
2014	122	46	76	0	0	53	63	85	PM2.5
2013	116	54	62	0	0	52	64	70	PM2.5
2012	116	47	69	0	0	54	64	77	PM2.5
2011	102	32	70	0	0	56	73	95	PM2.5
2010	112	28	84	0	0	58	72	88	PM2.5
2009	116	38	78	0	0	55	68	85	PM2.5
2008	115	19	95	1	0	58	73	110	PM2.5
2007	118	24	91	3	0	61	83	124	PM2.5
2006	119	19	100	0	0	65	85	100	PM2.5
2005	112	19	90	3	0	61	82	117	PM2.5
2004	109	10	94	5	0	62	86	115	PM2.5
2003	113	14	95	4	0	60	80	108	PM2.5
2002	107	19	87	1	0	60	81	104	PM2.5
2001	112	16	92	4	0	63	87	138	PM2.5
2000	100	6	90	3	1	67	88	164	PM2.5
1999	104	2	92	10	0	70	98	126	PM2.5

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Georgia with a similar median AQI in 2025

All monitored counties in Georgia

Source: U.S. EPA AirData, “Annual AQI by County” files for 1999–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem