Counties in Georgia by share of days unhealthy for sensitive groups or worse (US EPA AQI)

Fulton County had the highest share of days unhealthy for sensitive groups or worse (US EPA AQI) of 35 counties in 2007, at 12.9%. Spalding County had the lowest, at 0%. The median was 5.8%. Source: EPA.

Highest12.9Fulton County

Lowest0Spalding County

Median5.835 counties

Map of counties, 2007

Under 2
2 to 3.4
3.4 to 5.8
5.8 to 7.8
7.8 to 10
10 and over
No data

%, 2007. Hatched areas have no value for this period. Source: Invokely calculation with data from EPA. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2007

%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2007 (%)	Change on 2006
1	Fulton County	12.9	+1.1 pts
2	Douglas County	12.5	+0.1 pts
3	Cobb County	12.4	-2.1 pts
4	DeKalb County	11	-2.2 pts
4	Fayette County	11	+0.3 pts
4	Gwinnett County	11	-0.6 pts
7	Bibb County	9.9	+3.3 pts
8	Chattooga County	9.2	+5.8 pts
9	Paulding County	9	+1.1 pts
10	Henry County	8.8	0 pts
11	Murray County	8.5	+4 pts
12	Clarke County	7.8	-0.4 pts
13	Coweta County	7.7	+1.6 pts
14	Rockdale County	7.4	-1.3 pts
15	Coffee County	6.1	+6.1 pts
16	Muscogee County	6	+1.9 pts
17	Pike County	5.8	-3.6 pts
17	Richmond County	5.8	+2.1 pts
19	Houston County	4.9	+4.9 pts
20	Columbia County	4.4	-0.6 pts
20	Dougherty County	4.4	+4.4 pts
22	Dawson County	4.1	+0.3 pts
23	Charlton County	3.4	+3.4 pts
23	Sumter County	3.4	-0.7 pts
25	Floyd County	3.1	+0.5 pts
26	Walker County	2.9	-0.3 pts
27	Clayton County	2.5	+2.5 pts
28	Walton County	2.2	+1.1 pts
29	Wilkinson County	2	+2 pts
30	Chatham County	1.9	+1.6 pts
30	Lowndes County	1.9	+1.9 pts
32	Washington County	1.7	+0.1 pts
33	Hall County	0.9	+0.9 pts
34	Glynn County	0.7	+0.3 pts
35	Spalding County	0	0 pts

Other periods

About this ranking

Days with a daily Air Quality Index above 100 (unhealthy for sensitive groups, unhealthy, very unhealthy or hazardous) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; the counts are stored with each value.

Use the share rather than the number of days to compare counties, since the days with an AQI differ. 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 2007 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts (Counties in Georgia by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2007) [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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Counties in Georgia by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2007. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/georgia-counties?period=2007. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Counties in Georgia by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2007. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/georgia-counties?period=2007.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Counties in Georgia by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2007 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/unhealthy-air-quality-days-share/georgia-counties?period=2007 (Accessed: 12 October 2026).

BibTeX

@misc{environmental_counties_in_georgia_by_2007,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Counties in Georgia by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2007}},
  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/unhealthy-air-quality-days-share/georgia-counties?period=2007. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Counties in Georgia by share of days unhealthy for sensitive groups or worse (US EPA AQI), 2007
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/unhealthy-air-quality-days-share/georgia-counties?period=2007
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/unhealthy-air-quality-days-share/georgia-counties?period=2007.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. 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 share of days unhealthy for sensitive groups or worse (US EPA AQI)?

Fulton County, with 12.9% in 2007, according to EPA.

Which county has the lowest share of days unhealthy for sensitive groups or worse (US EPA AQI)?

Spalding County, with 0% in 2007.

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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 4 counties have no value for 2007 and are not ranked.