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

DeKalb County had the highest highest daily Air Quality Index (US EPA) of 35 counties in 2006, at 217. Spalding County had the lowest, at 40. The median was 154. Source: the U.S. Environmental Protection Agency.

Highest217DeKalb County

Lowest40Spalding County

Median15435 counties

Map of counties, 2006

Under 96
96 to 120
120 to 150
150 to 160
160 to 200
200 and over
No data

index, 2006. 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, 2006

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

Full ranking

Rank	Counties	2006 index	Change on 2005
1	DeKalb County	217	+20
2	Gwinnett County	215	+65
3	Fulton County	214	+5
4	Cobb County	203	+49
4	Douglas County	203	+6
4	Rockdale County	203	+21
7	Fayette County	195	+16
7	Henry County	195	-10
9	Pike County	179	+29
10	Paulding County	177	+23
11	Richmond County	169	+13
12	Bibb County	164	-13
13	Clarke County	161	0
13	Columbia County	161	+28
15	Coweta County	156	-7
15	Floyd County	156	+40
15	Sumter County	156	+16
18	Muscogee County	154	+4
19	Dawson County	151	-8
20	Murray County	150	-1
21	Chattooga County	143	-7
21	Walker County	143	+39
23	Glynn County	122	-5
24	Chatham County	119	-19
25	Walton County	116	-38
26	Washington County	103	+2
27	Clayton County	100	-17
27	Dougherty County	100	-7
29	Wilkinson County	99	-11
30	Hall County	90	-17
31	Houston County	89	-5
32	Coffee County	86	-11
33	Lowndes County	83	-7
34	Charlton County	77	-21
35	Spalding County	40	-19

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 2006 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), 2006) [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), 2006. 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=2006. 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), 2006. 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=2006.

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), 2006 [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=2006 (Accessed: 12 October 2026).

BibTeX

@misc{environmental_counties_in_georgia_by_2006,
  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), 2006}},
  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=2006. 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), 2006
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=2006
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/highest-daily-air-quality-index/georgia-counties?period=2006.
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)?

DeKalb County, with 217 in 2006, according to the U.S. Environmental Protection Agency.

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

Spalding County, with 40 in 2006.

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 2006 and are not ranked.