Counties in Georgia by highest daily Air Quality Index (US EPA)

Fulton County had the highest highest daily Air Quality Index (US EPA) of 35 counties in 2008, at 211. Spalding County had the lowest, at 46. The median was 129. Source: the U.S. Environmental Protection Agency.

Highest211Fulton County

Lowest46Spalding County

Median12935 counties

Map of counties, 2008

Under 100
100 to 110
110 to 130
130 to 150
150 to 160
160 and over
No data

index, 2008. Hatched areas have no value for this period. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2008

index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2008 index	Change on 2007
1	Fulton County	211	-10
2	Rockdale County	203	-4
3	Henry County	192	-9
4	DeKalb County	182	-38
5	Coweta County	164	-37
6	Pike County	159	+3
7	Gwinnett County	156	-29
8	Cobb County	155	-17
9	Bibb County	151	-44
9	Fayette County	151	-46
11	Douglas County	150	-27
12	Paulding County	147	-19
13	Richmond County	143	-21
14	Clarke County	140	-16
15	Chatham County	136	-20
16	Dawson County	133	-28
16	Murray County	133	-26
18	Columbia County	129	-35
18	Muscogee County	129	-57
20	Hall County	128	-14
21	Dougherty County	121	-70
22	Houston County	117	-92
22	Lowndes County	117	-47
24	Clayton County	110	-14
25	Floyd County	106	-43
26	Sumter County	105	-38
27	Walker County	102	-25
28	Chattooga County	101	-81
28	Glynn County	101	-48
28	Walton County	101	-57
31	Washington County	90	-20
31	Wilkinson County	90	-50
33	Charlton County	85	-77
34	Coffee County	82	-42
35	Spalding County	46	+6

Other periods

About this ranking

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 4 counties with data in other periods have no value for 2008 and are left out rather than filled from another source. Equal values share a rank.

How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: highest daily AQI (Counties in Georgia by highest daily Air Quality Index (US EPA), 2008) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: highest daily AQI, Counties in Georgia by highest daily Air Quality Index (US EPA), 2008. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2008. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Counties in Georgia by highest daily Air Quality Index (US EPA), 2008. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2008.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Counties in Georgia by highest daily Air Quality Index (US EPA), 2008 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2008 (Accessed: 12 October 2026).

BibTeX

@misc{environmental_counties_in_georgia_by_2008,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Counties in Georgia by highest daily Air Quality Index (US EPA), 2008}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2008. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download\_files.html\#Annual. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: highest daily AQI: Counties in Georgia by highest daily Air Quality Index (US EPA), 2008
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2008
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2008.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -

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Questions

Which county has the highest highest daily Air Quality Index (US EPA)?

Fulton County, with 211 in 2008, according to the U.S. Environmental Protection Agency.

Which county has the lowest highest daily Air Quality Index (US EPA)?

Spalding County, with 46 in 2008.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12. 4 counties have no value for 2008 and are not ranked.