Hall County, Georgia air quality history

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

58%

Good days in 2025

Median daily AQI, 2025

Days above 100 in 2025

364

Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Hall, Georgia on 364 days. 210 of those days (58%) were in the Good range, and the median daily AQI was 46. 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 364 days. Across the years with fuller monitoring, the share of Good days rose: an average of 27% in 2008–2010 versus 51% in 2023–2025.

Years with fewer than 120 monitored days (2003, 2004, 2005, 2006, 2007, 2016…) 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)	364	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	364	210	154	0	0	46	62	82	PM2.5
2024	366	176	190	0	0	52	68	100	PM2.5
2023	363	166	194	3	0	52	68	137	PM2.5
2022	364	217	147	0	0	46	60	79	PM2.5
2021	365	209	156	0	0	46	62	83	PM2.5
2020	360	221	139	0	0	44	60	99	PM2.5
2019	340	181	159	0	0	49	62	90	PM2.5
2018	322	220	102	0	0	41	58	72	PM2.5
2017	254	144	110	0	0	48	61	72	PM2.5
2016	119	78	39	1	1	40	57	156	PM2.5
2015	264	81	183	0	0	55	69	95	PM2.5
2014	318	114	204	0	0	55	69	96	PM2.5
2013	342	145	197	0	0	53	68	91	PM2.5
2012	328	121	207	0	0	54	65	78	PM2.5
2011	351	94	257	0	0	57	73	99	PM2.5
2010	354	94	260	0	0	60	78	99	PM2.5
2009	326	105	221	0	0	55	69	93	PM2.5
2008	347	72	273	2	0	60	80	128	PM2.5
2007	108	30	77	1	0	57	78	142	PM2.5
2006	110	30	80	0	0	60	77	90	PM2.5
2005	112	25	85	2	0	58	76	107	PM2.5
2004	116	30	86	0	0	60	76	99	PM2.5
2003	109	20	88	1	0	60	78	120	PM2.5
2002	108	29	79	0	0	59	81	92	PM2.5
2001	113	26	85	2	0	61	88	104	PM2.5
2000	102	10	87	5	0	65	85	149	PM2.5
1999	100	11	87	2	0	67	91	120	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