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

Wilkinson County had the highest highest daily Air Quality Index (US EPA) of 32 counties in 2009, at 287. Charlton County had the lowest, at 65. The median was 117. Source: the U.S. Environmental Protection Agency.

Highest287Wilkinson County

Lowest65Charlton County

Median11732 counties

Map of counties, 2009

Under 98
98 to 110
110 to 120
120 to 140
140 to 150
150 and over
No data

index, 2009. 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, 2009

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

Full ranking

Rank	Counties	2009 index	Change on 2008
1	Wilkinson County	287	+197
2	Bibb County	201	+50
3	Fulton County	172	-39
4	Cobb County	164	+9
5	Walker County	155	+53
6	Rockdale County	154	-49
7	Richmond County	151	+8
8	Douglas County	147	-3
8	Gwinnett County	147	-9
10	Glynn County	144	+43
11	DeKalb County	143	-39
12	Henry County	136	-56
13	Murray County	133	0
14	Coffee County	132	+50
15	Dougherty County	120	-1
16	Floyd County	119	+13
17	Chatham County	115	-21
18	Clarke County	112	-28
19	Houston County	111	-6
20	Paulding County	108	-39
21	Washington County	107	+17
22	Muscogee County	106	-23
23	Coweta County	102	-62
24	Dawson County	101	-32
25	Chattooga County	100	-1
25	Pike County	100	-59
27	Lowndes County	98	-19
28	Hall County	93	-35
29	Columbia County	90	-39
30	Clayton County	85	-25
31	Sumter County	74	-31
32	Charlton County	65	-20

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. 7 counties with data in other periods have no value for 2009 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), 2009) [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), 2009. 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=2009. 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), 2009. 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=2009.

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), 2009 [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=2009 (Accessed: 12 October 2026).

BibTeX

@misc{environmental_counties_in_georgia_by_2009,
  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), 2009}},
  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=2009. 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), 2009
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=2009
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2009.
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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Rank Counties in Georgia by highest daily Air Quality Index (US EPA) using official data, and cite the source.

rank_places {"indicator":"aqi_max","level":"province","within":"Georgia","limit":10}
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Questions

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

Wilkinson County, with 287 in 2009, according to the U.S. Environmental Protection Agency.

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

Charlton County, with 65 in 2009.

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. 7 counties have no value for 2009 and are not ranked.